一、jinfo
1、简介
jinfo(Configuration Info for Java) 查看虚拟机配置参数信思，也可用于调整虚拟机的配置参数。
在很多情况下，Java应用程序不会指定所有的Java虚拟机参数。而此时，开发人员可能不知道某一个具体的Java虚拟机参数的默认值。在这种情况下，可能需要通过查找文档获取某个参数的默认值。这个查找过程可能是非常艰难的。但有了 jinfo工具，开发人员可以很方便地找到Java虚拟机参数的当前值。
jinfo不仅可以查看运行时某一个Java虚拟机参数的实际取值， 甚至可以在运行时修改部分参 数，并使之立即生效。 但是，并非所有参数都支持动态修改。参数只有被标记 manageable的flag可以被实时修改。其实，这个修改能力是 极其有限的。
2、jinfo -sysprops pid ：查看该进程的全部配置信息
描述：输出当前 jvm 进行的全部的系统属性
2.1、启动如下程序
package com.kgf.kgfjavalearning2021.jvm; import java.util.ArrayList; /*** * 测试GC的频率: * 设置内存大小：-Xmx60m -XX:SurvivorRatio=8 * * -Xmx60m: 表示是最大堆的大小, 也就是当你的虚拟机启动后， 就会分配这么大的堆内存给你 * -XX:SurvivorRatio=8: * 设置新生代中eden和S0/S1空间的比例 * 默认 * -XX:SurvivorRatio=8,Eden:S0:S1=8:1:1 * 假如 * -XX:SurvivorRatio=4,Eden:S0:S1=4:1:1 * SurvivorRatio值就是设置Eden区的比例占多少,S0/S1相同 * */ public class GCTest { public static void main(String[] args) { ArrayList<byte[]> list = new ArrayList<>(); for (int i = 0; i < 1000; i++) { byte[] arr = new byte[1024*100];//每次向list中存放100kb的字节数组 list.add(arr); try { Thread.sleep(100); } catch (InterruptedException e) { e.printStackTrace(); } } } }在idea中设置堆内存：
2.2、使用jinfo命令查看,查看到的参数其实在我们的java中是可以通过system.getProperties()参数进行获取到的，其实就是环境变量
命令：jinfo -sysprops pid
C:\Users\86136>jps 10864 GCTest 11248 RemoteMavenServer 2052 8616 Jps 4972 Launcher C:\Users\86136>jinfo -sysprops 10864 Attaching to process ID 10864, please wait... Debugger attached successfully. Server compiler detected. JVM version is 25.51-b03 java.runtime.name = Java(TM) SE Runtime Environment java.vm.version = 25.51-b03 sun.boot.library.path = D:\jdk1.8.0_51\jre\bin java.vendor.url = http://java.oracle.com/ java.vm.vendor = Oracle Corporation path.separator = ; file.encoding.pkg = sun.io java.vm.name = Java HotSpot(TM) 64-Bit Server VM sun.os.patch.level = sun.java.launcher = SUN_STANDARD user.script = user.country = CN user.dir = E:\WorkSpace\kgf-java-learning2021 java.vm.specification.name = Java Virtual Machine Specification java.runtime.version = 1.8.0_51-b16 java.awt.graphicsenv = sun.awt.Win32GraphicsEnvironment os.arch = amd64 java.endorsed.dirs = D:\jdk1.8.0_51\jre\lib\endorsed line.separator = java.io.tmpdir = C:\Users\86136\AppData\Local\Temp\ java.vm.specification.vendor = Oracle Corporation user.variant = os.name = Windows 8.1 sun.jnu.encoding = GBK java.library.path = D:\jdk1.8.0_51\bin;C:\WINDOWS\Sun\Java\bin;C:\WINDOWS\system32;C:\WINDOWS;E:\WorkSpace\software\Python37\Scripts\;E:\WorkSpace\software\Python37\;D:\oracle12c\product\12.2.0\dbhome_1\bin;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\iCLS\;C:\Program Files\Intel\Intel(R) Management Engine Components\iCLS\;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Windows\System32\OpenSSH\;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files (x86)\NVIDIA Corporation\PhysX\Common;D:\jdk1.8.0_51\bin;D:\apache-maven-3.5.2\bin;D:\TortoiseSVN\bin;D:\oracleClient\instantclient_12_2;D:\mysql-5.7.24-winx64\bin;D:\zookeeper-3.4.10\bin;d:\Git\cmd;D:\Redis-x64-3.2.100;D:\hadoopWorkSpace\hadoop-2.7.2\bin;C:\Program Files (x86)\Common Files\Thunder Network\KanKan\Codecs;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;C:\WINDOWS\System32\OpenSSH\;D:\scala-2.11.8\bin;D:\gradle-6.7\bin;D:\nodejs\;D:\OpenSSL-Win64\bin;D:\software\Vagrant\bin;C:\Ruby27-x64\bin;C:\Users\86136\AppData\Local\Microsoft\WindowsApps;;D:\Microsoft VS Code\bin;C:\Users\86136\AppData\Roaming\npm;. java.specification.name = Java Platform API Specification java.class.version = 52.0 sun.management.compiler = HotSpot 64-Bit Tiered Compilers os.version = 6.3 user.home = C:\Users\86136 user.timezone = Asia/Shanghai java.awt.printerjob = sun.awt.windows.WPrinterJob file.encoding = UTF-8 java.specification.version = 1.8 user.name = 86136 java.class.path = D:\jdk1.8.0_51\jre\lib\charsets.jar;D:\jdk1.8.0_51\jre\lib\deploy.jar;D:\jdk1.8.0_51\jre\lib\ext\access-bridge-64.jar;D:\jdk1.8.0_51\jre\lib\ext\cldrdata.jar;D:\jdk1.8.0_51\jre\lib\ext\dnsns.jar;D:\jdk1.8.0_51\jre\lib\ext\jaccess.jar;D:\jdk1.8.0_51\jre\lib\ext\jfxrt.jar;D:\jdk1.8.0_51\jre\lib\ext\localedata.jar;D:\jdk1.8.0_51\jre\lib\ext\nashorn.jar;D:\jdk1.8.0_51\jre\lib\ext\sunec.jar;D:\jdk1.8.0_51\jre\lib\ext\sunjce_provider.jar;D:\jdk1.8.0_51\jre\lib\ext\sunmscapi.jar;D:\jdk1.8.0_51\jre\lib\ext\sunpkcs11.jar;D:\jdk1.8.0_51\jre\lib\ext\zipfs.jar;D:\jdk1.8.0_51\jre\lib\javaws.jar;D:\jdk1.8.0_51\jre\lib\jce.jar;D:\jdk1.8.0_51\jre\lib\jfr.jar;D:\jdk1.8.0_51\jre\lib\jfxswt.jar;D:\jdk1.8.0_51\jre\lib\jsse.jar;D:\jdk1.8.0_51\jre\lib\management-agent.jar;D:\jdk1.8.0_51\jre\lib\plugin.jar;D:\jdk1.8.0_51\jre\lib\resources.jar;D:\jdk1.8.0_51\jre\lib\rt.jar;E:\WorkSpace\kgf-java-learning2021\target\classes;D:\repository\org\springframework\boot\spring-boot-starter-web\2.5.6\spring-boot-starter-web-2.5.6.jar;D:\repository\org\springframework\boot\spring-boot-starter\2.5.6\spring-boot-starter-2.5.6.jar;D:\repository\org\springframework\boot\spring-boot-starter-logging\2.5.6\spring-boot-starter-logging-2.5.6.jar;D:\repository\ch\qos\logback\logback-classic\1.2.6\logback-classic-1.2.6.jar;D:\repository\ch\qos\logback\logback-core\1.2.6\logback-core-1.2.6.jar;D:\repository\org\apache\logging\log4j\log4j-to-slf4j\2.14.1\log4j-to-slf4j-2.14.1.jar;D:\repository\org\apache\logging\log4j\log4j-api\2.14.1\log4j-api-2.14.1.jar;D:\repository\org\slf4j\jul-to-slf4j\1.7.32\jul-to-slf4j-1.7.32.jar;D:\repository\jakarta\annotation\jakarta.annotation-api\1.3.5\jakarta.annotation-api-1.3.5.jar;D:\repository\org\yaml\snakeyaml\1.28\snakeyaml-1.28.jar;D:\repository\org\springframework\boot\spring-boot-starter-json\2.5.6\spring-boot-starter-json-2.5.6.jar;D:\repository\com\fasterxml\jackson\core\jackson-databind\2.12.5\jackson-databind-2.12.5.jar;D:\repository\com\fasterxml\jackson\core\jackson-annotations\2.12.5\jackson-annotations-2.12.5.jar;D:\repository\com\fasterxml\jackson\core\jackson-core\2.12.5\jackson-core-2.12.5.jar;D:\repository\com\fasterxml\jackson\datatype\jackson-datatype-jdk8\2.12.5\jackson-datatype-jdk8-2.12.5.jar;D:\repository\com\fasterxml\jackson\datatype\jackson-datatype-jsr310\2.12.5\jackson-datatype-jsr310-2.12.5.jar;D:\repository\com\fasterxml\jackson\module\jackson-module-parameter-names\2.12.5\jackson-module-parameter-names-2.12.5.jar;D:\repository\org\springframework\boot\spring-boot-starter-tomcat\2.5.6\spring-boot-starter-tomcat-2.5.6.jar;D:\repository\org\apache\tomcat\embed\tomcat-embed-core\9.0.54\tomcat-embed-core-9.0.54.jar;D:\repository\org\apache\tomcat\embed\tomcat-embed-el\9.0.54\tomcat-embed-el-9.0.54.jar;D:\repository\org\apache\tomcat\embed\tomcat-embed-websocket\9.0.54\tomcat-embed-websocket-9.0.54.jar;D:\repository\org\springframework\spring-web\5.3.12\spring-web-5.3.12.jar;D:\repository\org\springframework\spring-beans\5.3.12\spring-beans-5.3.12.jar;D:\repository\org\springframework\spring-webmvc\5.3.12\spring-webmvc-5.3.12.jar;D:\repository\org\springframework\spring-aop\5.3.12\spring-aop-5.3.12.jar;D:\repository\org\springframework\spring-context\5.3.12\spring-context-5.3.12.jar;D:\repository\org\springframework\spring-expression\5.3.12\spring-expression-5.3.12.jar;D:\repository\org\springframework\boot\spring-boot-devtools\2.5.6\spring-boot-devtools-2.5.6.jar;D:\repository\org\springframework\boot\spring-boot\2.5.6\spring-boot-2.5.6.jar;D:\repository\org\springframework\boot\spring-boot-autoconfigure\2.5.6\spring-boot-autoconfigure-2.5.6.jar;D:\repository\org\projectlombok\lombok\1.18.16\lombok-1.18.16.jar;D:\repository\org\slf4j\slf4j-api\1.7.32\slf4j-api-1.7.32.jar;D:\repository\org\springframework\spring-core\5.3.12\spring-core-5.3.12.jar;D:\repository\org\springframework\spring-jcl\5.3.12\spring-jcl-5.3.12.jar;D:\repository\com\google\guava\guava\20.0\guava-20.0.jar;D:\repository\org\apache\commons\commons-lang3\3.12.0\commons-lang3-3.12.0.jar;D:\repository\com\alibaba\fastjson\1.2.75\fastjson-1.2.75.jar;D:\repository\cn\hutool\hutool-all\5.5.1\hutool-all-5.5.1.jar;D:\repository\org\apache\poi\poi-ooxml\4.1.2\poi-ooxml-4.1.2.jar;D:\repository\org\apache\commons\commons-compress\1.19\commons-compress-1.19.jar;D:\repository\com\github\virtuald\curvesapi\1.06\curvesapi-1.06.jar;D:\repository\org\apache\poi\poi-ooxml-schemas\4.1.2\poi-ooxml-schemas-4.1.2.jar;D:\repository\org\apache\xmlbeans\xmlbeans\3.1.0\xmlbeans-3.1.0.jar;D:\repository\org\apache\poi\poi\4.1.2\poi-4.1.2.jar;D:\repository\commons-codec\commons-codec\1.15\commons-codec-1.15.jar;D:\repository\org\apache\commons\commons-collections4\4.4\commons-collections4-4.4.jar;D:\repository\org\apache\commons\commons-math3\3.6.1\commons-math3-3.6.1.jar;D:\repository\com\zaxxer\SparseBitSet\1.2\SparseBitSet-1.2.jar;D:\JetBrains\idea20190303\lib\idea_rt.jar java.vm.specification.version = 1.8 sun.arch.data.model = 64 sun.java.command = com.kgf.kgfjavalearning2021.jvm.GCTest java.home = D:\jdk1.8.0_51\jre user.language = zh java.specification.vendor = Oracle Corporation awt.toolkit = sun.awt.windows.WToolkit java.vm.info = mixed mode java.version = 1.8.0_51 java.ext.dirs = D:\jdk1.8.0_51\jre\lib\ext;C:\WINDOWS\Sun\Java\lib\ext sun.boot.class.path = D:\jdk1.8.0_51\jre\lib\resources.jar;D:\jdk1.8.0_51\jre\lib\rt.jar;D:\jdk1.8.0_51\jre\lib\sunrsasign.jar;D:\jdk1.8.0_51\jre\lib\jsse.jar;D:\jdk1.8.0_51\jre\lib\jce.jar;D:\jdk1.8.0_51\jre\lib\charsets.jar;D:\jdk1.8.0_51\jre\lib\jfr.jar;D:\jdk1.8.0_51\jre\classes java.vendor = Oracle Corporation file.separator = \ java.vendor.url.bug = http://bugreport.sun.com/bugreport/ sun.io.unicode.encoding = UnicodeLittle sun.cpu.endian = little sun.desktop = windows sun.cpu.isalist = amd64 C:\Users\86136>
3、jinfo -flags pid： 查看曾经赋过值的参数值
命令：jinfo -flags 10696
C:\Users\86136>jps 11248 RemoteMavenServer 4992 Launcher 2052 10696 GCTest 13596 Jps C:\Users\86136>jinfo -flags 10696 Attaching to process ID 10696, please wait... Debugger attached successfully. Server compiler detected. JVM version is 25.51-b03 Non-default VM flags: -XX:CICompilerCount=4 -XX:InitialHeapSize=62914560 -XX:MaxHeapSize=62914560 -XX:MaxNewSize=20971520 -XX:MinHeapDeltaBytes=524288 -XX:NewSize=20971520 -XX:OldSize=41943040 -XX:SurvivorRatio=8 -XX:+UseCompressedClassPointers -XX:+UseCompressedOops -XX:+UseFastUnorderedTimeStamps -XX:-UseLargePagesIndividualAllocation -XX:+UseParallelGC Command line: -Xmx60m -XX:SurvivorRatio=8 -javaagent:D:\JetBrains\idea20190303\lib\idea_rt.jar=1036:D:\JetBrains\idea20190303\bin -Dfile.encoding=UTF-8 C:\Users\86136>
4、jinfo -flag <具体参数> pid： 查看具体参数的值
上面我们在程序里面设置了最大的堆内存是60M,这里的内存刚好是60M
5、使用jinfo进行参数修改
jinfo不仅可以查看运行时某一个Java虚拟机参数的实际取值， 甚至可以在运行时修改部分参 数，并使之立即生效。 但是，并非所有参数都支持动态修改。参数只有被标记 manageable的flag可以被实时修改。其实，这个修改能力是 极其有限的
5.1、布尔类型: jinfo -flag +-参数 pid
5.2、非布尔类型: jinfo -flag 参数名=参数值 pid
6、查看JVM启动参数值
java -XX: -PrintFlagslnitial 查看所有JVM参数启动的初始值
java -XX: +PrintFlagsFinal 查看所有JVM参数的最终值(这个用的更多一些)
java -XX: +PrintCommandLineflags 查看那些已经被用户或者JVM设置过的详细的XX参数的名称和值上面前两个用的比较多一些，特别是第二个
6.1、我们使用java -XX: +PrintFlagsFinal输出到一个文件中
命令：java -XX: +PrintFlagsFinal >1.txt
1.txt内容如下：
下面我们查看JVM的最大堆内存：
可以发现最大堆内存为4G,初始化堆内存为256M，安装下面的计算时正确的，因为我的电脑是16G的内存
- 默认情况下:
- 初始内存大小：
物理电脑内存大小/64- 最大内存大小：
物理电脑内存大小/4[Global flags] uintx AdaptiveSizeDecrementScaleFactor = 4 {product} uintx AdaptiveSizeMajorGCDecayTimeScale = 10 {product} uintx AdaptiveSizePausePolicy = 0 {product} uintx AdaptiveSizePolicyCollectionCostMargin = 50 {product} uintx AdaptiveSizePolicyInitializingSteps = 20 {product} uintx AdaptiveSizePolicyOutputInterval = 0 {product} uintx AdaptiveSizePolicyWeight = 10 {product} uintx AdaptiveSizeThroughPutPolicy = 0 {product} uintx AdaptiveTimeWeight = 25 {product} bool AdjustConcurrency = false {product} bool AggressiveOpts = false {product} intx AliasLevel = 3 {C2 product} bool AlignVector = false {C2 product} intx AllocateInstancePrefetchLines = 1 {product} intx AllocatePrefetchDistance = 192 {product} intx AllocatePrefetchInstr = 3 {product} intx AllocatePrefetchLines = 4 {product} intx AllocatePrefetchStepSize = 64 {product} intx AllocatePrefetchStyle = 1 {product} bool AllowJNIEnvProxy = false {product} bool AllowNonVirtualCalls = false {product} bool AllowParallelDefineClass = false {product} bool AllowUserSignalHandlers = false {product} bool AlwaysActAsServerClassMachine = false {product} bool AlwaysCompileLoopMethods = false {product} bool AlwaysLockClassLoader = false {product} bool AlwaysPreTouch = false {product} bool AlwaysRestoreFPU = false {product} bool AlwaysTenure = false {product} bool AssertOnSuspendWaitFailure = false {product} bool AssumeMP = false {product} intx AutoBoxCacheMax = 128 {C2 product} uintx AutoGCSelectPauseMillis = 5000 {product} intx BCEATraceLevel = 0 {product} intx BackEdgeThreshold = 100000 {pd product} bool BackgroundCompilation = true {pd product} uintx BaseFootPrintEstimate = 268435456 {product} intx BiasedLockingBulkRebiasThreshold = 20 {product} intx BiasedLockingBulkRevokeThreshold = 40 {product} intx BiasedLockingDecayTime = 25000 {product} intx BiasedLockingStartupDelay = 4000 {product} bool BindGCTaskThreadsToCPUs = false {product} bool BlockLayoutByFrequency = true {C2 product} intx BlockLayoutMinDiamondPercentage = 20 {C2 product} bool BlockLayoutRotateLoops = true {C2 product} bool BranchOnRegister = false {C2 product} bool BytecodeVerificationLocal = false {product} bool BytecodeVerificationRemote = true {product} bool C1OptimizeVirtualCallProfiling = true {C1 product} bool C1ProfileBranches = true {C1 product} bool C1ProfileCalls = true {C1 product} bool C1ProfileCheckcasts = true {C1 product} bool C1ProfileInlinedCalls = true {C1 product} bool C1ProfileVirtualCalls = true {C1 product} bool C1UpdateMethodData = true {C1 product} intx CICompilerCount := 4 {product} bool CICompilerCountPerCPU = true {product} bool CITime = false {product} bool CMSAbortSemantics = false {product} uintx CMSAbortablePrecleanMinWorkPerIteration = 100 {product} intx CMSAbortablePrecleanWaitMillis = 100 {manageable} uintx CMSBitMapYieldQuantum = 10485760 {product} uintx CMSBootstrapOccupancy = 50 {product} bool CMSClassUnloadingEnabled = true {product} uintx CMSClassUnloadingMaxInterval = 0 {product} bool CMSCleanOnEnter = true {product} bool CMSCompactWhenClearAllSoftRefs = true {product} uintx CMSConcMarkMultiple = 32 {product} bool CMSConcurrentMTEnabled = true {product} uintx CMSCoordinatorYieldSleepCount = 10 {product} bool CMSDumpAtPromotionFailure = false {product} bool CMSEdenChunksRecordAlways = true {product} uintx CMSExpAvgFactor = 50 {product} bool CMSExtrapolateSweep = false {product} uintx CMSFullGCsBeforeCompaction = 0 {product} uintx CMSIncrementalDutyCycle = 10 {product} uintx CMSIncrementalDutyCycleMin = 0 {product} bool CMSIncrementalMode = false {product} uintx CMSIncrementalOffset = 0 {product} bool CMSIncrementalPacing = true {product} uintx CMSIncrementalSafetyFactor = 10 {product} uintx CMSIndexedFreeListReplenish = 4 {product} intx CMSInitiatingOccupancyFraction = -1 {product} uintx CMSIsTooFullPercentage = 98 {product} double CMSLargeCoalSurplusPercent = 0.950000 {product} double CMSLargeSplitSurplusPercent = 1.000000 {product} bool CMSLoopWarn = false {product} uintx CMSMaxAbortablePrecleanLoops = 0 {product} intx CMSMaxAbortablePrecleanTime = 5000 {product} uintx CMSOldPLABMax = 1024 {product} uintx CMSOldPLABMin = 16 {product} uintx CMSOldPLABNumRefills = 4 {product} uintx CMSOldPLABReactivityFactor = 2 {product} bool CMSOldPLABResizeQuicker = false {product} uintx CMSOldPLABToleranceFactor = 4 {product} bool CMSPLABRecordAlways = true {product} uintx CMSParPromoteBlocksToClaim = 16 {product} bool CMSParallelInitialMarkEnabled = true {product} bool CMSParallelRemarkEnabled = true {product} bool CMSParallelSurvivorRemarkEnabled = true {product} uintx CMSPrecleanDenominator = 3 {product} uintx CMSPrecleanIter = 3 {product} uintx CMSPrecleanNumerator = 2 {product} bool CMSPrecleanRefLists1 = true {product} bool CMSPrecleanRefLists2 = false {product} bool CMSPrecleanSurvivors1 = false {product} bool CMSPrecleanSurvivors2 = true {product} uintx CMSPrecleanThreshold = 1000 {product} bool CMSPrecleaningEnabled = true {product} bool CMSPrintChunksInDump = false {product} bool CMSPrintEdenSurvivorChunks = false {product} bool CMSPrintObjectsInDump = false {product} uintx CMSRemarkVerifyVariant = 1 {product} bool CMSReplenishIntermediate = true {product} uintx CMSRescanMultiple = 32 {product} uintx CMSSamplingGrain = 16384 {product} bool CMSScavengeBeforeRemark = false {product} uintx CMSScheduleRemarkEdenPenetration = 50 {product} uintx CMSScheduleRemarkEdenSizeThreshold = 2097152 {product} uintx CMSScheduleRemarkSamplingRatio = 5 {product} double CMSSmallCoalSurplusPercent = 1.050000 {product} double CMSSmallSplitSurplusPercent = 1.100000 {product} bool CMSSplitIndexedFreeListBlocks = true {product} intx CMSTriggerInterval = -1 {manageable} uintx CMSTriggerRatio = 80 {product} intx CMSWaitDuration = 2000 {manageable} uintx CMSWorkQueueDrainThreshold = 10 {product} bool CMSYield = true {product} uintx CMSYieldSleepCount = 0 {product} uintx CMSYoungGenPerWorker = 67108864 {pd product} uintx CMS_FLSPadding = 1 {product} uintx CMS_FLSWeight = 75 {product} uintx CMS_SweepPadding = 1 {product} uintx CMS_SweepTimerThresholdMillis = 10 {product} uintx CMS_SweepWeight = 75 {product} bool CheckEndorsedAndExtDirs = false {product} bool CheckJNICalls = false {product} bool ClassUnloading = true {product} bool ClassUnloadingWithConcurrentMark = true {product} intx ClearFPUAtPark = 0 {product} bool ClipInlining = true {product} uintx CodeCacheExpansionSize = 65536 {pd product} uintx CodeCacheMinimumFreeSpace = 512000 {product} bool CollectGen0First = false {product} bool CompactFields = true {product} intx CompilationPolicyChoice = 3 {product} ccstrlist CompileCommand = {product} ccstr CompileCommandFile = {product} ccstrlist CompileOnly = {product} intx CompileThreshold = 10000 {pd product} bool CompilerThreadHintNoPreempt = true {product} intx CompilerThreadPriority = -1 {product} intx CompilerThreadStackSize = 0 {pd product} uintx CompressedClassSpaceSize = 1073741824 {product} uintx ConcGCThreads = 0 {product} intx ConditionalMoveLimit = 3 {C2 pd product} intx ContendedPaddingWidth = 128 {product} bool ConvertSleepToYield = true {pd product} bool ConvertYieldToSleep = false {product} bool CreateMinidumpOnCrash = false {product} bool CriticalJNINatives = true {product} bool DTraceAllocProbes = false {product} bool DTraceMethodProbes = false {product} bool DTraceMonitorProbes = false {product} bool Debugging = false {product} uintx DefaultMaxRAMFraction = 4 {product} intx DefaultThreadPriority = -1 {product} intx DeferPollingPageLoopCount = -1 {product} intx DeferThrSuspendLoopCount = 4000 {product} bool DeoptimizeRandom = false {product} bool DisableAttachMechanism = false {product} bool DisableExplicitGC = false {product} bool DisplayVMOutputToStderr = false {product} bool DisplayVMOutputToStdout = false {product} bool DoEscapeAnalysis = true {C2 product} bool DontCompileHugeMethods = true {product} bool DontYieldALot = false {pd product} ccstr DumpLoadedClassList = {product} bool DumpReplayDataOnError = true {product} bool DumpSharedSpaces = false {product} bool EagerXrunInit = false {product} intx EliminateAllocationArraySizeLimit = 64 {C2 product} bool EliminateAllocations = true {C2 product} bool EliminateAutoBox = true {C2 product} bool EliminateLocks = true {C2 product} bool EliminateNestedLocks = true {C2 product} intx EmitSync = 0 {product} bool EnableContended = true {product} bool EnableSharedLookupCache = true {product} bool EnableTracing = false {product} uintx ErgoHeapSizeLimit = 0 {product} ccstr ErrorFile = {product} ccstr ErrorReportServer = {product} double EscapeAnalysisTimeout = 20.000000 {C2 product} bool EstimateArgEscape = true {product} bool ExplicitGCInvokesConcurrent = false {product} bool ExplicitGCInvokesConcurrentAndUnloadsClasses = false {product} bool ExtendedDTraceProbes = false {product} ccstr ExtraSharedClassListFile = {product} bool FLSAlwaysCoalesceLarge = false {product} uintx FLSCoalescePolicy = 2 {product} double FLSLargestBlockCoalesceProximity = 0.990000 {product} bool FailOverToOldVerifier = true {product} bool FastTLABRefill = true {product} intx FenceInstruction = 0 {ARCH product} intx FieldsAllocationStyle = 1 {product} bool FilterSpuriousWakeups = true {product} ccstr FlightRecorderOptions = {product} bool ForceNUMA = false {product} bool ForceTimeHighResolution = false {product} intx FreqInlineSize = 325 {pd product} double G1ConcMarkStepDurationMillis = 10.000000 {product} uintx G1ConcRSHotCardLimit = 4 {product} uintx G1ConcRSLogCacheSize = 10 {product} intx G1ConcRefinementGreenZone = 0 {product} intx G1ConcRefinementRedZone = 0 {product} intx G1ConcRefinementServiceIntervalMillis = 300 {product} uintx G1ConcRefinementThreads = 0 {product} intx G1ConcRefinementThresholdStep = 0 {product} intx G1ConcRefinementYellowZone = 0 {product} uintx G1ConfidencePercent = 50 {product} uintx G1HeapRegionSize = 0 {product} uintx G1HeapWastePercent = 5 {product} uintx G1MixedGCCountTarget = 8 {product} intx G1RSetRegionEntries = 0 {product} uintx G1RSetScanBlockSize = 64 {product} intx G1RSetSparseRegionEntries = 0 {product} intx G1RSetUpdatingPauseTimePercent = 10 {product} intx G1RefProcDrainInterval = 10 {product} uintx G1ReservePercent = 10 {product} uintx G1SATBBufferEnqueueingThresholdPercent = 60 {product} intx G1SATBBufferSize = 1024 {product} intx G1UpdateBufferSize = 256 {product} bool G1UseAdaptiveConcRefinement = true {product} uintx GCDrainStackTargetSize = 64 {product} uintx GCHeapFreeLimit = 2 {product} uintx GCLockerEdenExpansionPercent = 5 {product} bool GCLockerInvokesConcurrent = false {product} uintx GCLogFileSize = 8192 {product} uintx GCPauseIntervalMillis = 0 {product} uintx GCTaskTimeStampEntries = 200 {product} uintx GCTimeLimit = 98 {product} uintx GCTimeRatio = 99 {product} uintx HeapBaseMinAddress = 2147483648 {pd product} bool HeapDumpAfterFullGC = false {manageable} bool HeapDumpBeforeFullGC = false {manageable} bool HeapDumpOnOutOfMemoryError = false {manageable} ccstr HeapDumpPath = {manageable} uintx HeapFirstMaximumCompactionCount = 3 {product} uintx HeapMaximumCompactionInterval = 20 {product} uintx HeapSizePerGCThread = 87241520 {product} bool IgnoreEmptyClassPaths = false {product} bool IgnoreUnrecognizedVMOptions = false {product} uintx IncreaseFirstTierCompileThresholdAt = 50 {product} bool IncrementalInline = true {C2 product} uintx InitialBootClassLoaderMetaspaceSize = 4194304 {product} uintx InitialCodeCacheSize = 2555904 {pd product} uintx InitialHeapSize := 266338304 {product} uintx InitialRAMFraction = 64 {product} uintx InitialSurvivorRatio = 8 {product} uintx InitialTenuringThreshold = 7 {product} uintx InitiatingHeapOccupancyPercent = 45 {product} bool Inline = true {product} ccstr InlineDataFile = {product} intx InlineSmallCode = 2000 {pd product} bool InlineSynchronizedMethods = true {C1 product} bool InsertMemBarAfterArraycopy = true {C2 product} intx InteriorEntryAlignment = 16 {C2 pd product} intx InterpreterProfilePercentage = 33 {product} bool JNIDetachReleasesMonitors = true {product} bool JavaMonitorsInStackTrace = true {product} intx JavaPriority10_To_OSPriority = -1 {product} intx JavaPriority1_To_OSPriority = -1 {product} intx JavaPriority2_To_OSPriority = -1 {product} intx JavaPriority3_To_OSPriority = -1 {product} intx JavaPriority4_To_OSPriority = -1 {product} intx JavaPriority5_To_OSPriority = -1 {product} intx JavaPriority6_To_OSPriority = -1 {product} intx JavaPriority7_To_OSPriority = -1 {product} intx JavaPriority8_To_OSPriority = -1 {product} intx JavaPriority9_To_OSPriority = -1 {product} bool LIRFillDelaySlots = false {C1 pd product} uintx LargePageHeapSizeThreshold = 134217728 {product} uintx LargePageSizeInBytes = 0 {product} bool LazyBootClassLoader = true {product} intx LiveNodeCountInliningCutoff = 40000 {C2 product} bool LogCommercialFeatures = false {product} intx LoopMaxUnroll = 16 {C2 product} intx LoopOptsCount = 43 {C2 product} intx LoopUnrollLimit = 60 {C2 pd product} intx LoopUnrollMin = 4 {C2 product} bool LoopUnswitching = true {C2 product} bool ManagementServer = false {product} uintx MarkStackSize = 4194304 {product} uintx MarkStackSizeMax = 536870912 {product} uintx MarkSweepAlwaysCompactCount = 4 {product} uintx MarkSweepDeadRatio = 1 {product} intx MaxBCEAEstimateLevel = 5 {product} intx MaxBCEAEstimateSize = 150 {product} uintx MaxDirectMemorySize = 0 {product} bool MaxFDLimit = true {product} uintx MaxGCMinorPauseMillis = 4294967295 {product} uintx MaxGCPauseMillis = 4294967295 {product} uintx MaxHeapFreeRatio = 100 {manageable} uintx MaxHeapSize := 4261412864 {product} intx MaxInlineLevel = 9 {product} intx MaxInlineSize = 35 {product} intx MaxJNILocalCapacity = 65536 {product} intx MaxJavaStackTraceDepth = 1024 {product} intx MaxJumpTableSize = 65000 {C2 product} intx MaxJumpTableSparseness = 5 {C2 product} intx MaxLabelRootDepth = 1100 {C2 product} intx MaxLoopPad = 11 {C2 product} uintx MaxMetaspaceExpansion = 5451776 {product} uintx MaxMetaspaceFreeRatio = 70 {product} uintx MaxMetaspaceSize = 4294901760 {product} uintx MaxNewSize := 1420296192 {product} intx MaxNodeLimit = 75000 {C2 product} uint64_t MaxRAM = 0 {pd product} uintx MaxRAMFraction = 4 {product} intx MaxRecursiveInlineLevel = 1 {product} uintx MaxTenuringThreshold = 15 {product} intx MaxTrivialSize = 6 {product} intx MaxVectorSize = 32 {C2 product} uintx MetaspaceSize = 21807104 {pd product} bool MethodFlushing = true {product} uintx MinHeapDeltaBytes := 524288 {product} uintx MinHeapFreeRatio = 0 {manageable} intx MinInliningThreshold = 250 {product} intx MinJumpTableSize = 10 {C2 pd product} uintx MinMetaspaceExpansion = 339968 {product} uintx MinMetaspaceFreeRatio = 40 {product} uintx MinRAMFraction = 2 {product} uintx MinSurvivorRatio = 3 {product} uintx MinTLABSize = 2048 {product} intx MonitorBound = 0 {product} bool MonitorInUseLists = false {product} intx MultiArrayExpandLimit = 6 {C2 product} bool MustCallLoadClassInternal = false {product} uintx NUMAChunkResizeWeight = 20 {product} uintx NUMAInterleaveGranularity = 2097152 {product} uintx NUMAPageScanRate = 256 {product} uintx NUMASpaceResizeRate = 1073741824 {product} bool NUMAStats = false {product} ccstr NativeMemoryTracking = off {product} bool NeedsDeoptSuspend = false {pd product} bool NeverActAsServerClassMachine = false {pd product} bool NeverTenure = false {product} uintx NewRatio = 2 {product} uintx NewSize := 88604672 {product} uintx NewSizeThreadIncrease = 5320 {pd product} intx NmethodSweepActivity = 10 {product} intx NmethodSweepCheckInterval = 5 {product} intx NmethodSweepFraction = 16 {product} intx NodeLimitFudgeFactor = 2000 {C2 product} uintx NumberOfGCLogFiles = 0 {product} intx NumberOfLoopInstrToAlign = 4 {C2 product} intx ObjectAlignmentInBytes = 8 {lp64_product} uintx OldPLABSize = 1024 {product} uintx OldPLABWeight = 50 {product} uintx OldSize := 177733632 {product} bool OmitStackTraceInFastThrow = true {product} ccstrlist OnError = {product} ccstrlist OnOutOfMemoryError = {product} intx OnStackReplacePercentage = 140 {pd product} bool OptimizeFill = true {C2 product} bool OptimizePtrCompare = true {C2 product} bool OptimizeStringConcat = true {C2 product} bool OptoBundling = false {C2 pd product} intx OptoLoopAlignment = 16 {pd product} bool OptoScheduling = false {C2 pd product} uintx PLABWeight = 75 {product} bool PSChunkLargeArrays = true {product} intx ParGCArrayScanChunk = 50 {product} uintx ParGCDesiredObjsFromOverflowList = 20 {product} bool ParGCTrimOverflow = true {product} bool ParGCUseLocalOverflow = false {product} uintx ParallelGCBufferWastePct = 10 {product} uintx ParallelGCThreads = 10 {product} bool ParallelGCVerbose = false {product} uintx ParallelOldDeadWoodLimiterMean = 50 {product} uintx ParallelOldDeadWoodLimiterStdDev = 80 {product} bool ParallelRefProcBalancingEnabled = true {product} bool ParallelRefProcEnabled = false {product} bool PartialPeelAtUnsignedTests = true {C2 product} bool PartialPeelLoop = true {C2 product} intx PartialPeelNewPhiDelta = 0 {C2 product} uintx PausePadding = 1 {product} intx PerBytecodeRecompilationCutoff = 200 {product} intx PerBytecodeTrapLimit = 4 {product} intx PerMethodRecompilationCutoff = 400 {product} intx PerMethodTrapLimit = 100 {product} bool PerfAllowAtExitRegistration = false {product} bool PerfBypassFileSystemCheck = false {product} intx PerfDataMemorySize = 32768 {product} intx PerfDataSamplingInterval = 50 {product} ccstr PerfDataSaveFile = {product} bool PerfDataSaveToFile = false {product} bool PerfDisableSharedMem = false {product} intx PerfMaxStringConstLength = 1024 {product} intx PreInflateSpin = 10 {pd product} bool PreferInterpreterNativeStubs = false {pd product} intx PrefetchCopyIntervalInBytes = 576 {product} intx PrefetchFieldsAhead = 1 {product} intx PrefetchScanIntervalInBytes = 576 {product} bool PreserveAllAnnotations = false {product} uintx PretenureSizeThreshold = 0 {product} bool PrintAdaptiveSizePolicy = false {product} bool PrintCMSInitiationStatistics = false {product} intx PrintCMSStatistics = 0 {product} bool PrintClassHistogram = false {manageable} bool PrintClassHistogramAfterFullGC = false {manageable} bool PrintClassHistogramBeforeFullGC = false {manageable} bool PrintCodeCache = false {product} bool PrintCodeCacheOnCompilation = false {product} bool PrintCommandLineFlags = false {product} bool PrintCompilation = false {product} bool PrintConcurrentLocks = false {manageable} intx PrintFLSCensus = 0 {product} intx PrintFLSStatistics = 0 {product} bool PrintFlagsFinal := true {product} bool PrintFlagsInitial = false {product} bool PrintGC = false {manageable} bool PrintGCApplicationConcurrentTime = false {product} bool PrintGCApplicationStoppedTime = false {product} bool PrintGCCause = true {product} bool PrintGCDateStamps = false {manageable} bool PrintGCDetails = false {manageable} bool PrintGCID = false {manageable} bool PrintGCTaskTimeStamps = false {product} bool PrintGCTimeStamps = false {manageable} bool PrintHeapAtGC = false {product rw} bool PrintHeapAtGCExtended = false {product rw} bool PrintHeapAtSIGBREAK = true {product} bool PrintJNIGCStalls = false {product} bool PrintJNIResolving = false {product} bool PrintOldPLAB = false {product} bool PrintOopAddress = false {product} bool PrintPLAB = false {product} bool PrintParallelOldGCPhaseTimes = false {product} bool PrintPromotionFailure = false {product} bool PrintReferenceGC = false {product} bool PrintSafepointStatistics = false {product} intx PrintSafepointStatisticsCount = 300 {product} intx PrintSafepointStatisticsTimeout = -1 {product} bool PrintSharedArchiveAndExit = false {product} bool PrintSharedDictionary = false {product} bool PrintSharedSpaces = false {product} bool PrintStringDeduplicationStatistics = false {product} bool PrintStringTableStatistics = false {product} bool PrintTLAB = false {product} bool PrintTenuringDistribution = false {product} bool PrintTieredEvents = false {product} bool PrintVMOptions = false {product} bool PrintVMQWaitTime = false {product} bool PrintWarnings = true {product} uintx ProcessDistributionStride = 4 {product} bool ProfileInterpreter = true {pd product} bool ProfileIntervals = false {product} intx ProfileIntervalsTicks = 100 {product} intx ProfileMaturityPercentage = 20 {product} bool ProfileVM = false {product} bool ProfilerPrintByteCodeStatistics = false {product} bool ProfilerRecordPC = false {product} uintx PromotedPadding = 3 {product} uintx QueuedAllocationWarningCount = 0 {product} uintx RTMRetryCount = 5 {ARCH product} bool RangeCheckElimination = true {product} intx ReadPrefetchInstr = 0 {ARCH product} bool ReassociateInvariants = true {C2 product} bool ReduceBulkZeroing = true {C2 product} bool ReduceFieldZeroing = true {C2 product} bool ReduceInitialCardMarks = true {C2 product} bool ReduceSignalUsage = false {product} intx RefDiscoveryPolicy = 0 {product} bool ReflectionWrapResolutionErrors = true {product} bool RegisterFinalizersAtInit = true {product} bool RelaxAccessControlCheck = false {product} ccstr ReplayDataFile = {product} bool RequireSharedSpaces = false {product} uintx ReservedCodeCacheSize = 251658240 {pd product} bool ResizeOldPLAB = true {product} bool ResizePLAB = true {product} bool ResizeTLAB = true {pd product} bool RestoreMXCSROnJNICalls = false {product} bool RestrictContended = true {product} bool RewriteBytecodes = true {pd product} bool RewriteFrequentPairs = true {pd product} intx SafepointPollOffset = 256 {C1 pd product} intx SafepointSpinBeforeYield = 2000 {product} bool SafepointTimeout = false {product} intx SafepointTimeoutDelay = 10000 {product} bool ScavengeBeforeFullGC = true {product} intx SelfDestructTimer = 0 {product} uintx SharedBaseAddress = 0 {product} ccstr SharedClassListFile = {product} uintx SharedMiscCodeSize = 122880 {product} uintx SharedMiscDataSize = 4194304 {product} uintx SharedReadOnlySize = 16777216 {product} uintx SharedReadWriteSize = 16777216 {product} bool ShowMessageBoxOnError = false {product} intx SoftRefLRUPolicyMSPerMB = 1000 {product} bool SpecialEncodeISOArray = true {C2 product} bool SplitIfBlocks = true {C2 product} intx StackRedPages = 1 {pd product} intx StackShadowPages = 6 {pd product} bool StackTraceInThrowable = true {product} intx StackYellowPages = 3 {pd product} bool StartAttachListener = false {product} intx StarvationMonitorInterval = 200 {product} bool StressLdcRewrite = false {product} uintx StringDeduplicationAgeThreshold = 3 {product} uintx StringTableSize = 60013 {product} bool SuppressFatalErrorMessage = false {product} uintx SurvivorPadding = 3 {product} uintx SurvivorRatio = 8 {product} intx SuspendRetryCount = 50 {product} intx SuspendRetryDelay = 5 {product} intx SyncFlags = 0 {product} ccstr SyncKnobs = {product} intx SyncVerbose = 0 {product} uintx TLABAllocationWeight = 35 {product} uintx TLABRefillWasteFraction = 64 {product} uintx TLABSize = 0 {product} bool TLABStats = true {product} uintx TLABWasteIncrement = 4 {product} uintx TLABWasteTargetPercent = 1 {product} uintx TargetPLABWastePct = 10 {product} uintx TargetSurvivorRatio = 50 {product} uintx TenuredGenerationSizeIncrement = 20 {product} uintx TenuredGenerationSizeSupplement = 80 {product} uintx TenuredGenerationSizeSupplementDecay = 2 {product} intx ThreadPriorityPolicy = 0 {product} bool ThreadPriorityVerbose = false {product} uintx ThreadSafetyMargin = 52428800 {product} intx ThreadStackSize = 0 {pd product} uintx ThresholdTolerance = 10 {product} intx Tier0BackedgeNotifyFreqLog = 10 {product} intx Tier0InvokeNotifyFreqLog = 7 {product} intx Tier0ProfilingStartPercentage = 200 {product} intx Tier23InlineeNotifyFreqLog = 20 {product} intx Tier2BackEdgeThreshold = 0 {product} intx Tier2BackedgeNotifyFreqLog = 14 {product} intx Tier2CompileThreshold = 0 {product} intx Tier2InvokeNotifyFreqLog = 11 {product} intx Tier3BackEdgeThreshold = 60000 {product} intx Tier3BackedgeNotifyFreqLog = 13 {product} intx Tier3CompileThreshold = 2000 {product} intx Tier3DelayOff = 2 {product} intx Tier3DelayOn = 5 {product} intx Tier3InvocationThreshold = 200 {product} intx Tier3InvokeNotifyFreqLog = 10 {product} intx Tier3LoadFeedback = 5 {product} intx Tier3MinInvocationThreshold = 100 {product} intx Tier4BackEdgeThreshold = 40000 {product} intx Tier4CompileThreshold = 15000 {product} intx Tier4InvocationThreshold = 5000 {product} intx Tier4LoadFeedback = 3 {product} intx Tier4MinInvocationThreshold = 600 {product} bool TieredCompilation = true {pd product} intx TieredCompileTaskTimeout = 50 {product} intx TieredRateUpdateMaxTime = 25 {product} intx TieredRateUpdateMinTime = 1 {product} intx TieredStopAtLevel = 4 {product} bool TimeLinearScan = false {C1 product} bool TraceBiasedLocking = false {product} bool TraceClassLoading = false {product rw} bool TraceClassLoadingPreorder = false {product} bool TraceClassPaths = false {product} bool TraceClassResolution = false {product} bool TraceClassUnloading = false {product rw} bool TraceDynamicGCThreads = false {product} bool TraceGen0Time = false {product} bool TraceGen1Time = false {product} ccstr TraceJVMTI = {product} bool TraceLoaderConstraints = false {product rw} bool TraceMetadataHumongousAllocation = false {product} bool TraceMonitorInflation = false {product} bool TraceParallelOldGCTasks = false {product} intx TraceRedefineClasses = 0 {product} bool TraceSafepointCleanupTime = false {product} bool TraceSharedLookupCache = false {product} bool TraceSuspendWaitFailures = false {product} intx TrackedInitializationLimit = 50 {C2 product} bool TransmitErrorReport = false {product} bool TrapBasedNullChecks = false {pd product} bool TrapBasedRangeChecks = false {C2 pd product} intx TypeProfileArgsLimit = 2 {product} uintx TypeProfileLevel = 111 {pd product} intx TypeProfileMajorReceiverPercent = 90 {C2 product} intx TypeProfileParmsLimit = 2 {product} intx TypeProfileWidth = 2 {product} intx UnguardOnExecutionViolation = 0 {product} bool UnlinkSymbolsALot = false {product} bool Use486InstrsOnly = false {ARCH product} bool UseAES = true {product} bool UseAESIntrinsics = true {product} intx UseAVX = 2 {ARCH product} bool UseAdaptiveGCBoundary = false {product} bool UseAdaptiveGenerationSizePolicyAtMajorCollection = true {product} bool UseAdaptiveGenerationSizePolicyAtMinorCollection = true {product} bool UseAdaptiveNUMAChunkSizing = true {product} bool UseAdaptiveSizeDecayMajorGCCost = true {product} bool UseAdaptiveSizePolicy = true {product} bool UseAdaptiveSizePolicyFootprintGoal = true {product} bool UseAdaptiveSizePolicyWithSystemGC = false {product} bool UseAddressNop = true {ARCH product} bool UseAltSigs = false {product} bool UseAutoGCSelectPolicy = false {product} bool UseBMI1Instructions = true {ARCH product} bool UseBMI2Instructions = true {ARCH product} bool UseBiasedLocking = true {product} bool UseBimorphicInlining = true {C2 product} bool UseBoundThreads = true {product} bool UseCLMUL = true {ARCH product} bool UseCMSBestFit = true {product} bool UseCMSCollectionPassing = true {product} bool UseCMSCompactAtFullCollection = true {product} bool UseCMSInitiatingOccupancyOnly = false {product} bool UseCRC32Intrinsics = true {product} bool UseCodeCacheFlushing = true {product} bool UseCompiler = true {product} bool UseCompilerSafepoints = true {product} bool UseCompressedClassPointers := true {lp64_product} bool UseCompressedOops := true {lp64_product} bool UseConcMarkSweepGC = false {product} bool UseCondCardMark = false {C2 product} bool UseCountLeadingZerosInstruction = true {ARCH product} bool UseCountTrailingZerosInstruction = true {ARCH product} bool UseCounterDecay = true {product} bool UseDivMod = true {C2 product} bool UseDynamicNumberOfGCThreads = false {product} bool UseFPUForSpilling = true {C2 product} bool UseFastAccessorMethods = false {product} bool UseFastEmptyMethods = false {product} bool UseFastJNIAccessors = true {product} bool UseFastStosb = true {ARCH product} bool UseG1GC = false {product} bool UseGCLogFileRotation = false {product} bool UseGCOverheadLimit = true {product} bool UseGCTaskAffinity = false {product} bool UseHeavyMonitors = false {product} bool UseInlineCaches = true {product} bool UseInterpreter = true {product} bool UseJumpTables = true {C2 product} bool UseLWPSynchronization = true {product} bool UseLargePages = false {pd product} bool UseLargePagesInMetaspace = false {product} bool UseLargePagesIndividualAllocation := false {pd product} bool UseLockedTracing = false {product} bool UseLoopCounter = true {product} bool UseLoopInvariantCodeMotion = true {C1 product} bool UseLoopPredicate = true {C2 product} bool UseMathExactIntrinsics = true {C2 product} bool UseMaximumCompactionOnSystemGC = true {product} bool UseMembar = false {pd product} bool UseMultiplyToLenIntrinsic = true {C2 product} bool UseNUMA = false {product} bool UseNUMAInterleaving = false {product} bool UseNewLongLShift = false {ARCH product} bool UseOSErrorReporting = false {pd product} bool UseOldInlining = true {C2 product} bool UseOnStackReplacement = true {pd product} bool UseOnlyInlinedBimorphic = true {C2 product} bool UseOptoBiasInlining = true {C2 product} bool UsePSAdaptiveSurvivorSizePolicy = true {product} bool UseParNewGC = false {product} bool UseParallelGC := true {product} bool UseParallelOldGC = true {product} bool UsePerfData = true {product} bool UsePopCountInstruction = true {product} bool UseRDPCForConstantTableBase = false {C2 product} bool UseRTMDeopt = false {ARCH product} bool UseRTMLocking = false {ARCH product} bool UseSHA = false {product} bool UseSHA1Intrinsics = false {product} bool UseSHA256Intrinsics = false {product} bool UseSHA512Intrinsics = false {product} intx UseSSE = 4 {product} bool UseSSE42Intrinsics = true {product} bool UseSerialGC = false {product} bool UseSharedSpaces = false {product} bool UseSignalChaining = true {product} bool UseStoreImmI16 = false {ARCH product} bool UseStringDeduplication = false {product} bool UseSuperWord = true {C2 product} bool UseTLAB = true {pd product} bool UseThreadPriorities = true {pd product} bool UseTypeProfile = true {product} bool UseTypeSpeculation = true {C2 product} bool UseUTCFileTimestamp = true {product} bool UseUnalignedLoadStores = true {ARCH product} bool UseVMInterruptibleIO = false {product} bool UseXMMForArrayCopy = true {product} bool UseXmmI2D = false {ARCH product} bool UseXmmI2F = false {ARCH product} bool UseXmmLoadAndClearUpper = true {ARCH product} bool UseXmmRegToRegMoveAll = true {ARCH product} bool VMThreadHintNoPreempt = false {product} intx VMThreadPriority = -1 {product} intx VMThreadStackSize = 0 {pd product} intx ValueMapInitialSize = 11 {C1 product} intx ValueMapMaxLoopSize = 8 {C1 product} intx ValueSearchLimit = 1000 {C2 product} bool VerifyMergedCPBytecodes = true {product} bool VerifySharedSpaces = false {product} intx WorkAroundNPTLTimedWaitHang = 1 {product} uintx YoungGenerationSizeIncrement = 20 {product} uintx YoungGenerationSizeSupplement = 80 {product} uintx YoungGenerationSizeSupplementDecay = 8 {product} uintx YoungPLABSize = 4096 {product} bool ZeroTLAB = false {product} intx hashCode = 5 {product}6.2、我们使用java -XX: +PrintFlagslnitial 输出到一个文件中
命令：java -XX:+PrintFlagsInitial >2.txt
2.txt内容如下：
[Global flags] uintx AdaptiveSizeDecrementScaleFactor = 4 {product} uintx AdaptiveSizeMajorGCDecayTimeScale = 10 {product} uintx AdaptiveSizePausePolicy = 0 {product} uintx AdaptiveSizePolicyCollectionCostMargin = 50 {product} uintx AdaptiveSizePolicyInitializingSteps = 20 {product} uintx AdaptiveSizePolicyOutputInterval = 0 {product} uintx AdaptiveSizePolicyWeight = 10 {product} uintx AdaptiveSizeThroughPutPolicy = 0 {product} uintx AdaptiveTimeWeight = 25 {product} bool AdjustConcurrency = false {product} bool AggressiveOpts = false {product} intx AliasLevel = 3 {C2 product} bool AlignVector = true {C2 product} intx AllocateInstancePrefetchLines = 1 {product} intx AllocatePrefetchDistance = -1 {product} intx AllocatePrefetchInstr = 0 {product} intx AllocatePrefetchLines = 3 {product} intx AllocatePrefetchStepSize = 16 {product} intx AllocatePrefetchStyle = 1 {product} bool AllowJNIEnvProxy = false {product} bool AllowNonVirtualCalls = false {product} bool AllowParallelDefineClass = false {product} bool AllowUserSignalHandlers = false {product} bool AlwaysActAsServerClassMachine = false {product} bool AlwaysCompileLoopMethods = false {product} bool AlwaysLockClassLoader = false {product} bool AlwaysPreTouch = false {product} bool AlwaysRestoreFPU = false {product} bool AlwaysTenure = false {product} bool AssertOnSuspendWaitFailure = false {product} bool AssumeMP = false {product} intx AutoBoxCacheMax = 128 {C2 product} uintx AutoGCSelectPauseMillis = 5000 {product} intx BCEATraceLevel = 0 {product} intx BackEdgeThreshold = 100000 {pd product} bool BackgroundCompilation = true {pd product} uintx BaseFootPrintEstimate = 268435456 {product} intx BiasedLockingBulkRebiasThreshold = 20 {product} intx BiasedLockingBulkRevokeThreshold = 40 {product} intx BiasedLockingDecayTime = 25000 {product} intx BiasedLockingStartupDelay = 4000 {product} bool BindGCTaskThreadsToCPUs = false {product} bool BlockLayoutByFrequency = true {C2 product} intx BlockLayoutMinDiamondPercentage = 20 {C2 product} bool BlockLayoutRotateLoops = true {C2 product} bool BranchOnRegister = false {C2 product} bool BytecodeVerificationLocal = false {product} bool BytecodeVerificationRemote = true {product} bool C1OptimizeVirtualCallProfiling = true {C1 product} bool C1ProfileBranches = true {C1 product} bool C1ProfileCalls = true {C1 product} bool C1ProfileCheckcasts = true {C1 product} bool C1ProfileInlinedCalls = true {C1 product} bool C1ProfileVirtualCalls = true {C1 product} bool C1UpdateMethodData = true {C1 product} intx CICompilerCount = 2 {product} bool CICompilerCountPerCPU = false {product} bool CITime = false {product} bool CMSAbortSemantics = false {product} uintx CMSAbortablePrecleanMinWorkPerIteration = 100 {product} intx CMSAbortablePrecleanWaitMillis = 100 {manageable} uintx CMSBitMapYieldQuantum = 10485760 {product} uintx CMSBootstrapOccupancy = 50 {product} bool CMSClassUnloadingEnabled = true {product} uintx CMSClassUnloadingMaxInterval = 0 {product} bool CMSCleanOnEnter = true {product} bool CMSCompactWhenClearAllSoftRefs = true {product} uintx CMSConcMarkMultiple = 32 {product} bool CMSConcurrentMTEnabled = true {product} uintx CMSCoordinatorYieldSleepCount = 10 {product} bool CMSDumpAtPromotionFailure = false {product} bool CMSEdenChunksRecordAlways = true {product} uintx CMSExpAvgFactor = 50 {product} bool CMSExtrapolateSweep = false {product} uintx CMSFullGCsBeforeCompaction = 0 {product} uintx CMSIncrementalDutyCycle = 10 {product} uintx CMSIncrementalDutyCycleMin = 0 {product} bool CMSIncrementalMode = false {product} uintx CMSIncrementalOffset = 0 {product} bool CMSIncrementalPacing = true {product} uintx CMSIncrementalSafetyFactor = 10 {product} uintx CMSIndexedFreeListReplenish = 4 {product} intx CMSInitiatingOccupancyFraction = -1 {product} uintx CMSIsTooFullPercentage = 98 {product} double CMSLargeCoalSurplusPercent = 0.950000 {product} double CMSLargeSplitSurplusPercent = 1.000000 {product} bool CMSLoopWarn = false {product} uintx CMSMaxAbortablePrecleanLoops = 0 {product} intx CMSMaxAbortablePrecleanTime = 5000 {product} uintx CMSOldPLABMax = 1024 {product} uintx CMSOldPLABMin = 16 {product} uintx CMSOldPLABNumRefills = 4 {product} uintx CMSOldPLABReactivityFactor = 2 {product} bool CMSOldPLABResizeQuicker = false {product} uintx CMSOldPLABToleranceFactor = 4 {product} bool CMSPLABRecordAlways = true {product} uintx CMSParPromoteBlocksToClaim = 16 {product} bool CMSParallelInitialMarkEnabled = true {product} bool CMSParallelRemarkEnabled = true {product} bool CMSParallelSurvivorRemarkEnabled = true {product} uintx CMSPrecleanDenominator = 3 {product} uintx CMSPrecleanIter = 3 {product} uintx CMSPrecleanNumerator = 2 {product} bool CMSPrecleanRefLists1 = true {product} bool CMSPrecleanRefLists2 = false {product} bool CMSPrecleanSurvivors1 = false {product} bool CMSPrecleanSurvivors2 = true {product} uintx CMSPrecleanThreshold = 1000 {product} bool CMSPrecleaningEnabled = true {product} bool CMSPrintChunksInDump = false {product} bool CMSPrintEdenSurvivorChunks = false {product} bool CMSPrintObjectsInDump = false {product} uintx CMSRemarkVerifyVariant = 1 {product} bool CMSReplenishIntermediate = true {product} uintx CMSRescanMultiple = 32 {product} uintx CMSSamplingGrain = 16384 {product} bool CMSScavengeBeforeRemark = false {product} uintx CMSScheduleRemarkEdenPenetration = 50 {product} uintx CMSScheduleRemarkEdenSizeThreshold = 2097152 {product} uintx CMSScheduleRemarkSamplingRatio = 5 {product} double CMSSmallCoalSurplusPercent = 1.050000 {product} double CMSSmallSplitSurplusPercent = 1.100000 {product} bool CMSSplitIndexedFreeListBlocks = true {product} intx CMSTriggerInterval = -1 {manageable} uintx CMSTriggerRatio = 80 {product} intx CMSWaitDuration = 2000 {manageable} uintx CMSWorkQueueDrainThreshold = 10 {product} bool CMSYield = true {product} uintx CMSYieldSleepCount = 0 {product} uintx CMSYoungGenPerWorker = 67108864 {pd product} uintx CMS_FLSPadding = 1 {product} uintx CMS_FLSWeight = 75 {product} uintx CMS_SweepPadding = 1 {product} uintx CMS_SweepTimerThresholdMillis = 10 {product} uintx CMS_SweepWeight = 75 {product} bool CheckEndorsedAndExtDirs = false {product} bool CheckJNICalls = false {product} bool ClassUnloading = true {product} bool ClassUnloadingWithConcurrentMark = true {product} intx ClearFPUAtPark = 0 {product} bool ClipInlining = true {product} uintx CodeCacheExpansionSize = 65536 {pd product} uintx CodeCacheMinimumFreeSpace = 512000 {product} bool CollectGen0First = false {product} bool CompactFields = true {product} intx CompilationPolicyChoice = 0 {product} ccstrlist CompileCommand = {product} ccstr CompileCommandFile = {product} ccstrlist CompileOnly = {product} intx CompileThreshold = 10000 {pd product} bool CompilerThreadHintNoPreempt = true {product} intx CompilerThreadPriority = -1 {product} intx CompilerThreadStackSize = 0 {pd product} uintx CompressedClassSpaceSize = 1073741824 {product} uintx ConcGCThreads = 0 {product} intx ConditionalMoveLimit = 3 {C2 pd product} intx ContendedPaddingWidth = 128 {product} bool ConvertSleepToYield = true {pd product} bool ConvertYieldToSleep = false {product} bool CreateMinidumpOnCrash = false {product} bool CriticalJNINatives = true {product} bool DTraceAllocProbes = false {product} bool DTraceMethodProbes = false {product} bool DTraceMonitorProbes = false {product} bool Debugging = false {product} uintx DefaultMaxRAMFraction = 4 {product} intx DefaultThreadPriority = -1 {product} intx DeferPollingPageLoopCount = -1 {product} intx DeferThrSuspendLoopCount = 4000 {product} bool DeoptimizeRandom = false {product} bool DisableAttachMechanism = false {product} bool DisableExplicitGC = false {product} bool DisplayVMOutputToStderr = false {product} bool DisplayVMOutputToStdout = false {product} bool DoEscapeAnalysis = true {C2 product} bool DontCompileHugeMethods = true {product} bool DontYieldALot = false {pd product} ccstr DumpLoadedClassList = {product} bool DumpReplayDataOnError = true {product} bool DumpSharedSpaces = false {product} bool EagerXrunInit = false {product} intx EliminateAllocationArraySizeLimit = 64 {C2 product} bool EliminateAllocations = true {C2 product} bool EliminateAutoBox = true {C2 product} bool EliminateLocks = true {C2 product} bool EliminateNestedLocks = true {C2 product} intx EmitSync = 0 {product} bool EnableContended = true {product} bool EnableSharedLookupCache = true {product} bool EnableTracing = false {product} uintx ErgoHeapSizeLimit = 0 {product} ccstr ErrorFile = {product} ccstr ErrorReportServer = {product} double EscapeAnalysisTimeout = 20.000000 {C2 product} bool EstimateArgEscape = true {product} bool ExplicitGCInvokesConcurrent = false {product} bool ExplicitGCInvokesConcurrentAndUnloadsClasses = false {product} bool ExtendedDTraceProbes = false {product} ccstr ExtraSharedClassListFile = {product} bool FLSAlwaysCoalesceLarge = false {product} uintx FLSCoalescePolicy = 2 {product} double FLSLargestBlockCoalesceProximity = 0.990000 {product} bool FailOverToOldVerifier = true {product} bool FastTLABRefill = true {product} intx FenceInstruction = 0 {ARCH product} intx FieldsAllocationStyle = 1 {product} bool FilterSpuriousWakeups = true {product} ccstr FlightRecorderOptions = {product} bool ForceNUMA = false {product} bool ForceTimeHighResolution = false {product} intx FreqInlineSize = 325 {pd product} double G1ConcMarkStepDurationMillis = 10.000000 {product} uintx G1ConcRSHotCardLimit = 4 {product} uintx G1ConcRSLogCacheSize = 10 {product} intx G1ConcRefinementGreenZone = 0 {product} intx G1ConcRefinementRedZone = 0 {product} intx G1ConcRefinementServiceIntervalMillis = 300 {product} uintx G1ConcRefinementThreads = 0 {product} intx G1ConcRefinementThresholdStep = 0 {product} intx G1ConcRefinementYellowZone = 0 {product} uintx G1ConfidencePercent = 50 {product} uintx G1HeapRegionSize = 0 {product} uintx G1HeapWastePercent = 5 {product} uintx G1MixedGCCountTarget = 8 {product} intx G1RSetRegionEntries = 0 {product} uintx G1RSetScanBlockSize = 64 {product} intx G1RSetSparseRegionEntries = 0 {product} intx G1RSetUpdatingPauseTimePercent = 10 {product} intx G1RefProcDrainInterval = 10 {product} uintx G1ReservePercent = 10 {product} uintx G1SATBBufferEnqueueingThresholdPercent = 60 {product} intx G1SATBBufferSize = 1024 {product} intx G1UpdateBufferSize = 256 {product} bool G1UseAdaptiveConcRefinement = true {product} uintx GCDrainStackTargetSize = 64 {product} uintx GCHeapFreeLimit = 2 {product} uintx GCLockerEdenExpansionPercent = 5 {product} bool GCLockerInvokesConcurrent = false {product} uintx GCLogFileSize = 8192 {product} uintx GCPauseIntervalMillis = 0 {product} uintx GCTaskTimeStampEntries = 200 {product} uintx GCTimeLimit = 98 {product} uintx GCTimeRatio = 99 {product} uintx HeapBaseMinAddress = 2147483648 {pd product} bool HeapDumpAfterFullGC = false {manageable} bool HeapDumpBeforeFullGC = false {manageable} bool HeapDumpOnOutOfMemoryError = false {manageable} ccstr HeapDumpPath = {manageable} uintx HeapFirstMaximumCompactionCount = 3 {product} uintx HeapMaximumCompactionInterval = 20 {product} uintx HeapSizePerGCThread = 87241520 {product} bool IgnoreEmptyClassPaths = false {product} bool IgnoreUnrecognizedVMOptions = false {product} uintx IncreaseFirstTierCompileThresholdAt = 50 {product} bool IncrementalInline = true {C2 product} uintx InitialBootClassLoaderMetaspaceSize = 4194304 {product} uintx InitialCodeCacheSize = 2555904 {pd product} uintx InitialHeapSize = 0 {product} uintx InitialRAMFraction = 64 {product} uintx InitialSurvivorRatio = 8 {product} uintx InitialTenuringThreshold = 7 {product} uintx InitiatingHeapOccupancyPercent = 45 {product} bool Inline = true {product} ccstr InlineDataFile = {product} intx InlineSmallCode = 1000 {pd product} bool InlineSynchronizedMethods = true {C1 product} bool InsertMemBarAfterArraycopy = true {C2 product} intx InteriorEntryAlignment = 16 {C2 pd product} intx InterpreterProfilePercentage = 33 {product} bool JNIDetachReleasesMonitors = true {product} bool JavaMonitorsInStackTrace = true {product} intx JavaPriority10_To_OSPriority = -1 {product} intx JavaPriority1_To_OSPriority = -1 {product} intx JavaPriority2_To_OSPriority = -1 {product} intx JavaPriority3_To_OSPriority = -1 {product} intx JavaPriority4_To_OSPriority = -1 {product} intx JavaPriority5_To_OSPriority = -1 {product} intx JavaPriority6_To_OSPriority = -1 {product} intx JavaPriority7_To_OSPriority = -1 {product} intx JavaPriority8_To_OSPriority = -1 {product} intx JavaPriority9_To_OSPriority = -1 {product} bool LIRFillDelaySlots = false {C1 pd product} uintx LargePageHeapSizeThreshold = 134217728 {product} uintx LargePageSizeInBytes = 0 {product} bool LazyBootClassLoader = true {product} intx LiveNodeCountInliningCutoff = 40000 {C2 product} bool LogCommercialFeatures = false {product} intx LoopMaxUnroll = 16 {C2 product} intx LoopOptsCount = 43 {C2 product} intx LoopUnrollLimit = 60 {C2 pd product} intx LoopUnrollMin = 4 {C2 product} bool LoopUnswitching = true {C2 product} bool ManagementServer = false {product} uintx MarkStackSize = 4194304 {product} uintx MarkStackSizeMax = 536870912 {product} uintx MarkSweepAlwaysCompactCount = 4 {product} uintx MarkSweepDeadRatio = 5 {product} intx MaxBCEAEstimateLevel = 5 {product} intx MaxBCEAEstimateSize = 150 {product} uintx MaxDirectMemorySize = 0 {product} bool MaxFDLimit = true {product} uintx MaxGCMinorPauseMillis = 4294967295 {product} uintx MaxGCPauseMillis = 4294967295 {product} uintx MaxHeapFreeRatio = 70 {manageable} uintx MaxHeapSize = 130862280 {product} intx MaxInlineLevel = 9 {product} intx MaxInlineSize = 35 {product} intx MaxJNILocalCapacity = 65536 {product} intx MaxJavaStackTraceDepth = 1024 {product} intx MaxJumpTableSize = 65000 {C2 product} intx MaxJumpTableSparseness = 5 {C2 product} intx MaxLabelRootDepth = 1100 {C2 product} intx MaxLoopPad = 15 {C2 product} uintx MaxMetaspaceExpansion = 5452592 {product} uintx MaxMetaspaceFreeRatio = 70 {product} uintx MaxMetaspaceSize = 4294967295 {product} uintx MaxNewSize = 4294967295 {product} intx MaxNodeLimit = 80000 {C2 product} uint64_t MaxRAM = 0 {pd product} uintx MaxRAMFraction = 4 {product} intx MaxRecursiveInlineLevel = 1 {product} uintx MaxTenuringThreshold = 15 {product} intx MaxTrivialSize = 6 {product} intx MaxVectorSize = 32 {C2 product} uintx MetaspaceSize = 21810376 {pd product} bool MethodFlushing = true {product} uintx MinHeapDeltaBytes = 170392 {product} uintx MinHeapFreeRatio = 40 {manageable} intx MinInliningThreshold = 250 {product} intx MinJumpTableSize = 10 {C2 pd product} uintx MinMetaspaceExpansion = 340784 {product} uintx MinMetaspaceFreeRatio = 40 {product} uintx MinRAMFraction = 2 {product} uintx MinSurvivorRatio = 3 {product} uintx MinTLABSize = 2048 {product} intx MonitorBound = 0 {product} bool MonitorInUseLists = false {product} intx MultiArrayExpandLimit = 6 {C2 product} bool MustCallLoadClassInternal = false {product} uintx NUMAChunkResizeWeight = 20 {product} uintx NUMAInterleaveGranularity = 2097152 {product} uintx NUMAPageScanRate = 256 {product} uintx NUMASpaceResizeRate = 1073741824 {product} bool NUMAStats = false {product} ccstr NativeMemoryTracking = off {product} bool NeedsDeoptSuspend = false {pd product} bool NeverActAsServerClassMachine = false {pd product} bool NeverTenure = false {product} uintx NewRatio = 2 {product} uintx NewSize = 1363144 {product} uintx NewSizeThreadIncrease = 5320 {pd product} intx NmethodSweepActivity = 10 {product} intx NmethodSweepCheckInterval = 5 {product} intx NmethodSweepFraction = 16 {product} intx NodeLimitFudgeFactor = 2000 {C2 product} uintx NumberOfGCLogFiles = 0 {product} intx NumberOfLoopInstrToAlign = 4 {C2 product} intx ObjectAlignmentInBytes = 8 {lp64_product} uintx OldPLABSize = 1024 {product} uintx OldPLABWeight = 50 {product} uintx OldSize = 5452592 {product} bool OmitStackTraceInFastThrow = true {product} ccstrlist OnError = {product} ccstrlist OnOutOfMemoryError = {product} intx OnStackReplacePercentage = 140 {pd product} bool OptimizeFill = true {C2 product} bool OptimizePtrCompare = true {C2 product} bool OptimizeStringConcat = true {C2 product} bool OptoBundling = false {C2 pd product} intx OptoLoopAlignment = 16 {pd product} bool OptoScheduling = false {C2 pd product} uintx PLABWeight = 75 {product} bool PSChunkLargeArrays = true {product} intx ParGCArrayScanChunk = 50 {product} uintx ParGCDesiredObjsFromOverflowList = 20 {product} bool ParGCTrimOverflow = true {product} bool ParGCUseLocalOverflow = false {product} uintx ParallelGCBufferWastePct = 10 {product} uintx ParallelGCThreads = 0 {product} bool ParallelGCVerbose = false {product} uintx ParallelOldDeadWoodLimiterMean = 50 {product} uintx ParallelOldDeadWoodLimiterStdDev = 80 {product} bool ParallelRefProcBalancingEnabled = true {product} bool ParallelRefProcEnabled = false {product} bool PartialPeelAtUnsignedTests = true {C2 product} bool PartialPeelLoop = true {C2 product} intx PartialPeelNewPhiDelta = 0 {C2 product} uintx PausePadding = 1 {product} intx PerBytecodeRecompilationCutoff = 200 {product} intx PerBytecodeTrapLimit = 4 {product} intx PerMethodRecompilationCutoff = 400 {product} intx PerMethodTrapLimit = 100 {product} bool PerfAllowAtExitRegistration = false {product} bool PerfBypassFileSystemCheck = false {product} intx PerfDataMemorySize = 32768 {product} intx PerfDataSamplingInterval = 50 {product} ccstr PerfDataSaveFile = {product} bool PerfDataSaveToFile = false {product} bool PerfDisableSharedMem = false {product} intx PerfMaxStringConstLength = 1024 {product} intx PreInflateSpin = 10 {pd product} bool PreferInterpreterNativeStubs = false {pd product} intx PrefetchCopyIntervalInBytes = -1 {product} intx PrefetchFieldsAhead = -1 {product} intx PrefetchScanIntervalInBytes = -1 {product} bool PreserveAllAnnotations = false {product} uintx PretenureSizeThreshold = 0 {product} bool PrintAdaptiveSizePolicy = false {product} bool PrintCMSInitiationStatistics = false {product} intx PrintCMSStatistics = 0 {product} bool PrintClassHistogram = false {manageable} bool PrintClassHistogramAfterFullGC = false {manageable} bool PrintClassHistogramBeforeFullGC = false {manageable} bool PrintCodeCache = false {product} bool PrintCodeCacheOnCompilation = false {product} bool PrintCommandLineFlags = false {product} bool PrintCompilation = false {product} bool PrintConcurrentLocks = false {manageable} intx PrintFLSCensus = 0 {product} intx PrintFLSStatistics = 0 {product} bool PrintFlagsFinal = false {product} bool PrintFlagsInitial = false {product} bool PrintGC = false {manageable} bool PrintGCApplicationConcurrentTime = false {product} bool PrintGCApplicationStoppedTime = false {product} bool PrintGCCause = true {product} bool PrintGCDateStamps = false {manageable} bool PrintGCDetails = false {manageable} bool PrintGCID = false {manageable} bool PrintGCTaskTimeStamps = false {product} bool PrintGCTimeStamps = false {manageable} bool PrintHeapAtGC = false {product rw} bool PrintHeapAtGCExtended = false {product rw} bool PrintHeapAtSIGBREAK = true {product} bool PrintJNIGCStalls = false {product} bool PrintJNIResolving = false {product} bool PrintOldPLAB = false {product} bool PrintOopAddress = false {product} bool PrintPLAB = false {product} bool PrintParallelOldGCPhaseTimes = false {product} bool PrintPromotionFailure = false {product} bool PrintReferenceGC = false {product} bool PrintSafepointStatistics = false {product} intx PrintSafepointStatisticsCount = 300 {product} intx PrintSafepointStatisticsTimeout = -1 {product} bool PrintSharedArchiveAndExit = false {product} bool PrintSharedDictionary = false {product} bool PrintSharedSpaces = false {product} bool PrintStringDeduplicationStatistics = false {product} bool PrintStringTableStatistics = false {product} bool PrintTLAB = false {product} bool PrintTenuringDistribution = false {product} bool PrintTieredEvents = false {product} bool PrintVMOptions = false {product} bool PrintVMQWaitTime = false {product} bool PrintWarnings = true {product} uintx ProcessDistributionStride = 4 {product} bool ProfileInterpreter = true {pd product} bool ProfileIntervals = false {product} intx ProfileIntervalsTicks = 100 {product} intx ProfileMaturityPercentage = 20 {product} bool ProfileVM = false {product} bool ProfilerPrintByteCodeStatistics = false {product} bool ProfilerRecordPC = false {product} uintx PromotedPadding = 3 {product} uintx QueuedAllocationWarningCount = 0 {product} uintx RTMRetryCount = 5 {ARCH product} bool RangeCheckElimination = true {product} intx ReadPrefetchInstr = 0 {ARCH product} bool ReassociateInvariants = true {C2 product} bool ReduceBulkZeroing = true {C2 product} bool ReduceFieldZeroing = true {C2 product} bool ReduceInitialCardMarks = true {C2 product} bool ReduceSignalUsage = false {product} intx RefDiscoveryPolicy = 0 {product} bool ReflectionWrapResolutionErrors = true {product} bool RegisterFinalizersAtInit = true {product} bool RelaxAccessControlCheck = false {product} ccstr ReplayDataFile = {product} bool RequireSharedSpaces = false {product} uintx ReservedCodeCacheSize = 50331648 {pd product} bool ResizeOldPLAB = true {product} bool ResizePLAB = true {product} bool ResizeTLAB = true {pd product} bool RestoreMXCSROnJNICalls = false {product} bool RestrictContended = true {product} bool RewriteBytecodes = true {pd product} bool RewriteFrequentPairs = true {pd product} intx SafepointPollOffset = 256 {C1 pd product} intx SafepointSpinBeforeYield = 2000 {product} bool SafepointTimeout = false {product} intx SafepointTimeoutDelay = 10000 {product} bool ScavengeBeforeFullGC = true {product} intx SelfDestructTimer = 0 {product} uintx SharedBaseAddress = 0 {product} ccstr SharedClassListFile = {product} uintx SharedMiscCodeSize = 122880 {product} uintx SharedMiscDataSize = 4194304 {product} uintx SharedReadOnlySize = 16777216 {product} uintx SharedReadWriteSize = 16777216 {product} bool ShowMessageBoxOnError = false {product} intx SoftRefLRUPolicyMSPerMB = 1000 {product} bool SpecialEncodeISOArray = true {C2 product} bool SplitIfBlocks = true {C2 product} intx StackRedPages = 1 {pd product} intx StackShadowPages = 6 {pd product} bool StackTraceInThrowable = true {product} intx StackYellowPages = 3 {pd product} bool StartAttachListener = false {product} intx StarvationMonitorInterval = 200 {product} bool StressLdcRewrite = false {product} uintx StringDeduplicationAgeThreshold = 3 {product} uintx StringTableSize = 60013 {product} bool SuppressFatalErrorMessage = false {product} uintx SurvivorPadding = 3 {product} uintx SurvivorRatio = 8 {product} intx SuspendRetryCount = 50 {product} intx SuspendRetryDelay = 5 {product} intx SyncFlags = 0 {product} ccstr SyncKnobs = {product} intx SyncVerbose = 0 {product} uintx TLABAllocationWeight = 35 {product} uintx TLABRefillWasteFraction = 64 {product} uintx TLABSize = 0 {product} bool TLABStats = true {product} uintx TLABWasteIncrement = 4 {product} uintx TLABWasteTargetPercent = 1 {product} uintx TargetPLABWastePct = 10 {product} uintx TargetSurvivorRatio = 50 {product} uintx TenuredGenerationSizeIncrement = 20 {product} uintx TenuredGenerationSizeSupplement = 80 {product} uintx TenuredGenerationSizeSupplementDecay = 2 {product} intx ThreadPriorityPolicy = 0 {product} bool ThreadPriorityVerbose = false {product} uintx ThreadSafetyMargin = 52428800 {product} intx ThreadStackSize = 0 {pd product} uintx ThresholdTolerance = 10 {product} intx Tier0BackedgeNotifyFreqLog = 10 {product} intx Tier0InvokeNotifyFreqLog = 7 {product} intx Tier0ProfilingStartPercentage = 200 {product} intx Tier23InlineeNotifyFreqLog = 20 {product} intx Tier2BackEdgeThreshold = 0 {product} intx Tier2BackedgeNotifyFreqLog = 14 {product} intx Tier2CompileThreshold = 0 {product} intx Tier2InvokeNotifyFreqLog = 11 {product} intx Tier3BackEdgeThreshold = 60000 {product} intx Tier3BackedgeNotifyFreqLog = 13 {product} intx Tier3CompileThreshold = 2000 {product} intx Tier3DelayOff = 2 {product} intx Tier3DelayOn = 5 {product} intx Tier3InvocationThreshold = 200 {product} intx Tier3InvokeNotifyFreqLog = 10 {product} intx Tier3LoadFeedback = 5 {product} intx Tier3MinInvocationThreshold = 100 {product} intx Tier4BackEdgeThreshold = 40000 {product} intx Tier4CompileThreshold = 15000 {product} intx Tier4InvocationThreshold = 5000 {product} intx Tier4LoadFeedback = 3 {product} intx Tier4MinInvocationThreshold = 600 {product} bool TieredCompilation = true {pd product} intx TieredCompileTaskTimeout = 50 {product} intx TieredRateUpdateMaxTime = 25 {product} intx TieredRateUpdateMinTime = 1 {product} intx TieredStopAtLevel = 4 {product} bool TimeLinearScan = false {C1 product} bool TraceBiasedLocking = false {product} bool TraceClassLoading = false {product rw} bool TraceClassLoadingPreorder = false {product} bool TraceClassPaths = false {product} bool TraceClassResolution = false {product} bool TraceClassUnloading = false {product rw} bool TraceDynamicGCThreads = false {product} bool TraceGen0Time = false {product} bool TraceGen1Time = false {product} ccstr TraceJVMTI = {product} bool TraceLoaderConstraints = false {product rw} bool TraceMetadataHumongousAllocation = false {product} bool TraceMonitorInflation = false {product} bool TraceParallelOldGCTasks = false {product} intx TraceRedefineClasses = 0 {product} bool TraceSafepointCleanupTime = false {product} bool TraceSharedLookupCache = false {product} bool TraceSuspendWaitFailures = false {product} intx TrackedInitializationLimit = 50 {C2 product} bool TransmitErrorReport = false {product} bool TrapBasedNullChecks = false {pd product} bool TrapBasedRangeChecks = false {C2 pd product} intx TypeProfileArgsLimit = 2 {product} uintx TypeProfileLevel = 111 {pd product} intx TypeProfileMajorReceiverPercent = 90 {C2 product} intx TypeProfileParmsLimit = 2 {product} intx TypeProfileWidth = 2 {product} intx UnguardOnExecutionViolation = 0 {product} bool UnlinkSymbolsALot = false {product} bool Use486InstrsOnly = false {ARCH product} bool UseAES = false {product} bool UseAESIntrinsics = false {product} intx UseAVX = 99 {ARCH product} bool UseAdaptiveGCBoundary = false {product} bool UseAdaptiveGenerationSizePolicyAtMajorCollection = true {product} bool UseAdaptiveGenerationSizePolicyAtMinorCollection = true {product} bool UseAdaptiveNUMAChunkSizing = true {product} bool UseAdaptiveSizeDecayMajorGCCost = true {product} bool UseAdaptiveSizePolicy = true {product} bool UseAdaptiveSizePolicyFootprintGoal = true {product} bool UseAdaptiveSizePolicyWithSystemGC = false {product} bool UseAddressNop = false {ARCH product} bool UseAltSigs = false {product} bool UseAutoGCSelectPolicy = false {product} bool UseBMI1Instructions = false {ARCH product} bool UseBMI2Instructions = false {ARCH product} bool UseBiasedLocking = true {product} bool UseBimorphicInlining = true {C2 product} bool UseBoundThreads = true {product} bool UseCLMUL = false {ARCH product} bool UseCMSBestFit = true {product} bool UseCMSCollectionPassing = true {product} bool UseCMSCompactAtFullCollection = true {product} bool UseCMSInitiatingOccupancyOnly = false {product} bool UseCRC32Intrinsics = false {product} bool UseCodeCacheFlushing = true {product} bool UseCompiler = true {product} bool UseCompilerSafepoints = true {product} bool UseCompressedClassPointers = false {lp64_product} bool UseCompressedOops = false {lp64_product} bool UseConcMarkSweepGC = false {product} bool UseCondCardMark = false {C2 product} bool UseCountLeadingZerosInstruction = false {ARCH product} bool UseCountTrailingZerosInstruction = false {ARCH product} bool UseCounterDecay = true {product} bool UseDivMod = true {C2 product} bool UseDynamicNumberOfGCThreads = false {product} bool UseFPUForSpilling = false {C2 product} bool UseFastAccessorMethods = true {product} bool UseFastEmptyMethods = true {product} bool UseFastJNIAccessors = true {product} bool UseFastStosb = false {ARCH product} bool UseG1GC = false {product} bool UseGCLogFileRotation = false {product} bool UseGCOverheadLimit = true {product} bool UseGCTaskAffinity = false {product} bool UseHeavyMonitors = false {product} bool UseInlineCaches = true {product} bool UseInterpreter = true {product} bool UseJumpTables = true {C2 product} bool UseLWPSynchronization = true {product} bool UseLargePages = false {pd product} bool UseLargePagesInMetaspace = false {product} bool UseLargePagesIndividualAllocation := false {pd product} bool UseLockedTracing = false {product} bool UseLoopCounter = true {product} bool UseLoopInvariantCodeMotion = true {C1 product} bool UseLoopPredicate = true {C2 product} bool UseMathExactIntrinsics = true {C2 product} bool UseMaximumCompactionOnSystemGC = true {product} bool UseMembar = false {pd product} bool UseMultiplyToLenIntrinsic = false {C2 product} bool UseNUMA = false {product} bool UseNUMAInterleaving = false {product} bool UseNewLongLShift = false {ARCH product} bool UseOSErrorReporting = false {pd product} bool UseOldInlining = true {C2 product} bool UseOnStackReplacement = true {pd product} bool UseOnlyInlinedBimorphic = true {C2 product} bool UseOptoBiasInlining = true {C2 product} bool UsePSAdaptiveSurvivorSizePolicy = true {product} bool UseParNewGC = false {product} bool UseParallelGC = false {product} bool UseParallelOldGC = false {product} bool UsePerfData = true {product} bool UsePopCountInstruction = false {product} bool UseRDPCForConstantTableBase = false {C2 product} bool UseRTMDeopt = false {ARCH product} bool UseRTMLocking = false {ARCH product} bool UseSHA = false {product} bool UseSHA1Intrinsics = false {product} bool UseSHA256Intrinsics = false {product} bool UseSHA512Intrinsics = false {product} intx UseSSE = 99 {product} bool UseSSE42Intrinsics = false {product} bool UseSerialGC = false {product} bool UseSharedSpaces = true {product} bool UseSignalChaining = true {product} bool UseStoreImmI16 = true {ARCH product} bool UseStringDeduplication = false {product} bool UseSuperWord = true {C2 product} bool UseTLAB = true {pd product} bool UseThreadPriorities = true {pd product} bool UseTypeProfile = true {product} bool UseTypeSpeculation = true {C2 product} bool UseUTCFileTimestamp = true {product} bool UseUnalignedLoadStores = false {ARCH product} bool UseVMInterruptibleIO = false {product} bool UseXMMForArrayCopy = false {product} bool UseXmmI2D = false {ARCH product} bool UseXmmI2F = false {ARCH product} bool UseXmmLoadAndClearUpper = true {ARCH product} bool UseXmmRegToRegMoveAll = false {ARCH product} bool VMThreadHintNoPreempt = false {product} intx VMThreadPriority = -1 {product} intx VMThreadStackSize = 0 {pd product} intx ValueMapInitialSize = 11 {C1 product} intx ValueMapMaxLoopSize = 8 {C1 product} intx ValueSearchLimit = 1000 {C2 product} bool VerifyMergedCPBytecodes = true {product} bool VerifySharedSpaces = false {product} intx WorkAroundNPTLTimedWaitHang = 1 {product} uintx YoungGenerationSizeIncrement = 20 {product} uintx YoungGenerationSizeSupplement = 80 {product} uintx YoungGenerationSizeSupplementDecay = 8 {product} uintx YoungPLABSize = 4096 {product} bool ZeroTLAB = false {product} intx hashCode = 5 {product}6.3、java -XX: +PrintCommandLineflags
C:\Users\86136>java -XX:+PrintCommandLineFlags -version -XX:InitialHeapSize=266275648 -XX:MaxHeapSize=4260410368 -XX:+PrintCommandLineFlags -XX:+UseCompressedClassPointers -XX:+UseCompressedOops -XX:-UseLargePagesIndividualAllocation -XX:+UseParallelGC java version "1.8.0_51" Java(TM) SE Runtime Environment (build 1.8.0_51-b16) Java HotSpot(TM) 64-Bit Server VM (build 25.51-b03, mixed mode)
今天的文章jvm调优常用命令_前端性能优化有哪些方法分享到此就结束了，感谢您的阅读。
版权声明：本文内容由互联网用户自发贡献，该文观点仅代表作者本人。本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容， 请发送邮件至 举报，一经查实，本站将立刻删除。
如需转载请保留出处：http://bianchenghao.cn/75299.html
