jcmdを試す
jcmdを試してみたメモです。
java7から追加されたユーティリティのjcmdを試してみたメモです。
他のユーティリティで対応するコマンドがあれば比較してみました。
(2017/10/02) jmapのliveオプションについて追記
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実行中のJVMプロセス表示
jcmd
引数なしで実行すると実行中のJVMプロセスを表示します。
$ jcmd 60630 org.jetbrains.idea.maven.server.RemoteMavenServer 60649 sun.tools.jcmd.JCmd 60603 60636 org.jetbrains.jps.cmdline.Launcher /Applications/IntelliJ IDEA CE.app/Contents/lib/util.jar:/Applications/IntelliJ IDEA CE.app/Contents/lib/httpclient-4.5.2.jar:/Applications/IntelliJ IDEA CE.app/Contents/lib/jna-platform.jar:/Applications/IntelliJ IDEA CE.app/Contents/lib/log4j.jar:/Applications/IntelliJ IDEA CE.app/Contents/lib/maven-aether-provider-3.3.9-all.jar:/Applications/IntelliJ IDEA CE.app/Contents/lib/idea_rt.jar:/Applications/IntelliJ IDEA CE.app/Contents/lib/resources_en.jar:/Applications/IntelliJ IDEA CE.app/Contents/lib/openapi.jar:/Applications/IntelliJ IDEA CE.app/Contents/lib/commons-codec-1.9.jar:/Applications/IntelliJ IDEA CE.app/Contents/lib/jps-model.jar:/Applications/IntelliJ IDEA CE.app/Contents/lib/lz4-java-1.3.jar:/Applications/IntelliJ IDEA CE.app/Contents/lib/nanoxml-2.2.3.jar:/Applications/IntelliJ IDEA CE.app/Contents/lib/netty-all-4.1.10.Final.jar:/Applications/IntelliJ IDEA CE.app/Contents/lib/jgoodies-forms.jar:/Applications/IntelliJ IDEA CE.app/Contents/lib/aether-1.1.0-all.j 60637 com.example.propagation.transaction.transactionpropagationexample.TransactionPropagationExampleApplication
jps -ml
jpsだと-mオプション(mainメソッドの引数)と-lオプション(フルパッケージ名)を付けた場合と一緒になりました。
$ jps -ml 60630 org.jetbrains.idea.maven.server.RemoteMavenServer 60603 60715 sun.tools.jps.Jps -ml 60636 org.jetbrains.jps.cmdline.Launcher /Applications/IntelliJ IDEA CE.app/Contents/lib/util.jar:/Applications/IntelliJ IDEA CE.app/Contents/lib/httpclient-4.5.2.jar:/Applications/IntelliJ IDEA CE.app/Contents/lib/jna-platform.jar:/Applications/IntelliJ IDEA CE.app/Contents/lib/log4j.jar:/Applications/IntelliJ IDEA CE.app/Contents/lib/maven-aether-provider-3.3.9-all.jar:/Applications/IntelliJ IDEA CE.app/Contents/lib/idea_rt.jar:/Applications/IntelliJ IDEA CE.app/Contents/lib/resources_en.jar:/Applications/IntelliJ IDEA CE.app/Contents/lib/openapi.jar:/Applications/IntelliJ IDEA CE.app/Contents/lib/commons-codec-1.9.jar:/Applications/IntelliJ IDEA CE.app/Contents/lib/jps-model.jar:/Applications/IntelliJ IDEA CE.app/Contents/lib/lz4-java-1.3.jar:/Applications/IntelliJ IDEA CE.app/Contents/lib/nanoxml-2.2.3.jar:/Applications/IntelliJ IDEA CE.app/Contents/lib/netty-all-4.1.10.Final.jar:/Applications/IntelliJ IDEA CE.app/Contents/lib/jgoodies-forms.jar:/Applications/IntelliJ IDEA CE.app/Contents/lib/aether-1.1.0-all.j 60637 com.example.propagation.transaction.transactionpropagationexample.TransactionPropagationExampleApplication
JVMの実行時間を表示
$ jcmd 33220 VM.uptime 33220: 125.074 s
システムプロパティを表示
jcmd <pid> VM.system_properties
VM.system_propertiesで対象プロセスのシステムプロパティを表示します。
$ jcmd 33220 VM.system_properties 33220: #Tue Sep 05 19:49:17 JST 2017 java.runtime.name=Java(TM) SE Runtime Environment sun.boot.library.path=/Library/Java/JavaVirtualMachines/jdk1.8.0_131.jdk/Contents/Home/jre/lib java.vm.version=25.131-b11 gopherProxySet=false java.vm.vendor=Oracle Corporation java.vendor.url=http\://java.oracle.com/ path.separator=\: java.vm.name=Java HotSpot(TM) 64-Bit Server VM file.encoding.pkg=sun.io user.country=JP sun.java.launcher=SUN_STANDARD sun.os.patch.level=unknown java.vm.specification.name=Java Virtual Machine Specification user.dir=/Users/abcdefg/Desktop/my_git/spring_examples/transaction-propagation-example PID=33220 java.runtime.version=1.8.0_131-b11 java.awt.graphicsenv=sun.awt.CGraphicsEnvironment java.endorsed.dirs=/Library/Java/JavaVirtualMachines/jdk1.8.0_131.jdk/Contents/Home/jre/lib/endorsed os.arch=x86_64 org.jboss.logging.provider=slf4j java.io.tmpdir=/var/folders/2b/j73cpspj0qj7226brkyy2hc80000gp/T/ line.separator=\n java.vm.specification.vendor=Oracle Corporation os.name=Mac OS X sun.jnu.encoding=UTF-8 java.library.path=/Users/abcdefg/Library/Java/Extensions\:/Library/Java/Extensions\:/Network/Library/Java/Extensions\:/System/Library/Java/Extensions\:/usr/lib/java\:. spring.beaninfo.ignore=true java.specification.name=Java Platform API Specification java.class.version=52.0 sun.management.compiler=HotSpot 64-Bit Tiered Compilers os.version=10.12.6 http.nonProxyHosts=local|*.local|169.254/16|*.169.254/16 user.home=/Users/abcdefg ： ： ：
jinfo -sysprops <pid>
jinfoでは-syspropsオプションでシステムプロパティを表示します。
$ jinfo -sysprops 69697 Attaching to process ID 69697, please wait... Debugger attached successfully. Server compiler detected. JVM version is 25.131-b11 java.runtime.name = Java(TM) SE Runtime Environment java.vm.version = 25.131-b11 sun.boot.library.path = /Library/Java/JavaVirtualMachines/jdk1.8.0_131.jdk/Contents/Home/jre/lib gopherProxySet = false 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 = unknown sun.java.launcher = SUN_STANDARD user.country = JP user.dir = /Users/abcdefg/Desktop/my_git/spring_examples/transaction-propagation-example java.vm.specification.name = Java Virtual Machine Specification PID = 69697 java.runtime.version = 1.8.0_131-b11 java.awt.graphicsenv = sun.awt.CGraphicsEnvironment os.arch = x86_64 java.endorsed.dirs = /Library/Java/JavaVirtualMachines/jdk1.8.0_131.jdk/Contents/Home/jre/lib/endorsed org.jboss.logging.provider = slf4j line.separator = java.io.tmpdir = /var/folders/2b/j73cpspj0qj7226brkyy2hc80000gp/T/ java.vm.specification.vendor = Oracle Corporation os.name = Mac OS X sun.jnu.encoding = UTF-8 java.library.path = /Users/abcdefg/Library/Java/Extensions:/Library/Java/Extensions:/Network/Library/Java/Extensions:/System/Library/Java/Extensions:/usr/lib/java:. spring.beaninfo.ignore = true java.class.version = 52.0 java.specification.name = Java Platform API Specification sun.management.compiler = HotSpot 64-Bit Tiered Compilers os.version = 10.12.6 http.nonProxyHosts = local|*.local|169.254/16|*.169.254/16 user.home = /Users/abcdefg ： ： ：
JVMバージョン
jcmd <pid> VM.version
$ jcmd 33220 VM.version 33220: Java HotSpot(TM) 64-Bit Server VM version 25.131-b11 JDK 8.0_131
JVMのコマンドライン引数
jcmd <pid> VM.command_line
VM.command_lineで対象プロセスのJVMコマンドライン引数を表示
$ jcmd 72311 VM.command_line 72311: VM Arguments: jvm_args: -javaagent:/Applications/IntelliJ IDEA CE.app/Contents/lib/idea_rt.jar=65242:/Applications/IntelliJ IDEA CE.app/Contents/bin -Dfile.encoding=UTF-8 java_command: com.example.propagation.transaction.transactionpropagationexample.TransactionPropagationExampleApplication java_class_path (initial): /Library/Java/JavaVirtualMachines/jdk1.8.0_131.jdk/Contents/Home/jre/lib/charsets.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_131.jdk/Contents/Home/jre/lib/deploy.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_131.jdk/Contents/Home/jre/lib/ext/cldrdata.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_131.jdk/Contents/Home/jre/lib/ext/dnsns.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_131.jdk/Contents/Home/jre/lib/ext/jaccess.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_131.jdk/Contents/Home/jre/lib/ext/jfxrt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_131.jdk/Contents/Home/jre/lib/ext/localedata.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_131.jdk/Contents/Home/jre/lib/ext/nashorn.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_131.jdk/Contents/Home/jre/lib/ext/sunec.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_131.jdk/Contents/Home/jre/lib/ext/sunjce_provider.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_131.jdk/Contents/Home/jre/lib/ext/sunpkcs11.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_131.jdk/Contents/Home/jre/lib/ext/zipfs.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_131.jdk/Contents/Home/jre/lib/javaws.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_131.jdk/Contents/Home/jre/lib/jce.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_131.jdk/Contents/Home/jre/lib/jfr.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_131.jdk/Contents/Home/jre/lib/jfxswt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_131.jdk/Contents/Home/jre/lib/jsse.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_131.jdk/Contents/Home/jre/lib/management-agent.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_131.jdk/Contents/Home/jre/lib/plugin.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_131.jdk/Contents/Home/jre/lib/resources.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_131.jdk/Contents/Home/jre/lib/rt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_131.jdk/Contents/Home/lib/ant-javafx.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_131.jdk/Contents/Home Launcher Type: SUN_STANDARD
jps -v <pid>
jpsでは-vでJVMの引数を表示します。
jcmd VM.command_lineでのjvm_argsに表示されているものが表示されてます。
$ jps -v 72311 TransactionPropagationExampleApplication -javaagent:/Applications/IntelliJ IDEA CE.app/Contents/lib/idea_rt.jar=65242:/Applications/IntelliJ IDEA CE.app/Contents/bin -Dfile.encoding=UTF-8
有効化されているフラグ表示
jcmd <pid> VM.flags
VM.flagsで対象プロセスのJVMで有効化されているフラグを出力
$ jcmd 72311 VM.flags 72311: -XX:CICompilerCount=4 -XX:InitialHeapSize=268435456 -XX:MaxHeapSize=4294967296 -XX:MaxNewSize=1431306240 -XX:MinHeapDeltaBytes=524288 -XX:NewSize=89128960 -XX:OldSize=179306496 -XX:+UseCompressedClassPointers -XX:+UseCompressedOops -XX:+UseFastUnorderedTimeStamps -XX:+UseParallelGC
-allを付けるとすべてのフラグを出力
$ jcmd 72311 VM.flags -all 72311: [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} ： ： ：
スレッドダンプ出力
jcmd <pid> Thread.print
Thread.printで対象プロセスのスレッドダンプ出力
$ jcmd 33220 Thread.print 33220: 2017-09-05 19:52:06 Full thread dump Java HotSpot(TM) 64-Bit Server VM (25.131-b11 mixed mode): "Attach Listener" #35 daemon prio=9 os_prio=31 tid=0x00007f85f6b5f800 nid=0x5b0b waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE "DestroyJavaVM" #34 prio=5 os_prio=31 tid=0x00007f85f817f000 nid=0x1c03 waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE "http-nio-8080-AsyncTimeout" #32 daemon prio=5 os_prio=31 tid=0x00007f85f9210800 nid=0x7d03 waiting on condition [0x0000700002a1c000] java.lang.Thread.State: TIMED_WAITING (sleeping) at java.lang.Thread.sleep(Native Method) at org.apache.coyote.AbstractProtocol$AsyncTimeout.run(AbstractProtocol.java:1200) at java.lang.Thread.run(Thread.java:748) "http-nio-8080-Acceptor-0" #31 daemon prio=5 os_prio=31 tid=0x00007f85f9268000 nid=0x7b03 runnable [0x0000700002919000] java.lang.Thread.State: RUNNABLE at sun.nio.ch.ServerSocketChannelImpl.accept0(Native Method) at sun.nio.ch.ServerSocketChannelImpl.accept(ServerSocketChannelImpl.java:422) at sun.nio.ch.ServerSocketChannelImpl.accept(ServerSocketChannelImpl.java:250) - locked <0x000000076f1dd610> (a java.lang.Object) at org.apache.tomcat.util.net.NioEndpoint$Acceptor.run(NioEndpoint.java:453) at java.lang.Thread.run(Thread.java:748) "http-nio-8080-ClientPoller-1" #30 daemon prio=5 os_prio=31 tid=0x00007f85f538f800 nid=0x7903 runnable [0x0000700002816000] java.lang.Thread.State: RUNNABLE at sun.nio.ch.KQueueArrayWrapper.kevent0(Native Method) at sun.nio.ch.KQueueArrayWrapper.poll(KQueueArrayWrapper.java:198) at sun.nio.ch.KQueueSelectorImpl.doSelect(KQueueSelectorImpl.java:117) at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86) - locked <0x000000076f2927d8> (a sun.nio.ch.Util$3) - locked <0x000000076f2927c8> (a java.util.Collections$UnmodifiableSet) - locked <0x000000076f2926a8> (a sun.nio.ch.KQueueSelectorImpl) at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97) at org.apache.tomcat.util.net.NioEndpoint$Poller.run(NioEndpoint.java:785) at java.lang.Thread.run(Thread.java:748) ： ： ： "VM Thread" os_prio=31 tid=0x00007f85f4809800 nid=0x3503 runnable "GC task thread#0 (ParallelGC)" os_prio=31 tid=0x00007f85f4806800 nid=0x2503 runnable "GC task thread#1 (ParallelGC)" os_prio=31 tid=0x00007f85f5012000 nid=0x2703 runnable "GC task thread#2 (ParallelGC)" os_prio=31 tid=0x00007f85f5013000 nid=0x2903 runnable "GC task thread#3 (ParallelGC)" os_prio=31 tid=0x00007f85f6000000 nid=0x2b03 runnable "GC task thread#4 (ParallelGC)" os_prio=31 tid=0x00007f85f6001000 nid=0x2d03 runnable "GC task thread#5 (ParallelGC)" os_prio=31 tid=0x00007f85f6001800 nid=0x2f03 runnable "GC task thread#6 (ParallelGC)" os_prio=31 tid=0x00007f85f6002000 nid=0x3103 runnable "GC task thread#7 (ParallelGC)" os_prio=31 tid=0x00007f85f6002800 nid=0x3303 runnable "VM Periodic Task Thread" os_prio=31 tid=0x00007f85f4838000 nid=0x5703 waiting on condition JNI global references: 284
jstack <pid>
jstackで対象プロセスのスレッドダンプ出力
$ jstack 33220 2017-09-05 19:52:48 Full thread dump Java HotSpot(TM) 64-Bit Server VM (25.131-b11 mixed mode): "Attach Listener" #35 daemon prio=9 os_prio=31 tid=0x00007f85f6b5f800 nid=0x5b0b waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE "DestroyJavaVM" #34 prio=5 os_prio=31 tid=0x00007f85f817f000 nid=0x1c03 waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE "http-nio-8080-AsyncTimeout" #32 daemon prio=5 os_prio=31 tid=0x00007f85f9210800 nid=0x7d03 waiting on condition [0x0000700002a1c000] java.lang.Thread.State: TIMED_WAITING (sleeping) at java.lang.Thread.sleep(Native Method) at org.apache.coyote.AbstractProtocol$AsyncTimeout.run(AbstractProtocol.java:1200) at java.lang.Thread.run(Thread.java:748) "http-nio-8080-Acceptor-0" #31 daemon prio=5 os_prio=31 tid=0x00007f85f9268000 nid=0x7b03 runnable [0x0000700002919000] java.lang.Thread.State: RUNNABLE at sun.nio.ch.ServerSocketChannelImpl.accept0(Native Method) at sun.nio.ch.ServerSocketChannelImpl.accept(ServerSocketChannelImpl.java:422) at sun.nio.ch.ServerSocketChannelImpl.accept(ServerSocketChannelImpl.java:250) - locked <0x000000076f1dd610> (a java.lang.Object) at org.apache.tomcat.util.net.NioEndpoint$Acceptor.run(NioEndpoint.java:453) at java.lang.Thread.run(Thread.java:748) "http-nio-8080-ClientPoller-1" #30 daemon prio=5 os_prio=31 tid=0x00007f85f538f800 nid=0x7903 runnable [0x0000700002816000] java.lang.Thread.State: RUNNABLE at sun.nio.ch.KQueueArrayWrapper.kevent0(Native Method) at sun.nio.ch.KQueueArrayWrapper.poll(KQueueArrayWrapper.java:198) at sun.nio.ch.KQueueSelectorImpl.doSelect(KQueueSelectorImpl.java:117) at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86) - locked <0x000000076f2927d8> (a sun.nio.ch.Util$3) - locked <0x000000076f2927c8> (a java.util.Collections$UnmodifiableSet) - locked <0x000000076f2926a8> (a sun.nio.ch.KQueueSelectorImpl) at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97) at org.apache.tomcat.util.net.NioEndpoint$Poller.run(NioEndpoint.java:785) at java.lang.Thread.run(Thread.java:748) ： ： ： "VM Thread" os_prio=31 tid=0x00007f85f4809800 nid=0x3503 runnable "GC task thread#0 (ParallelGC)" os_prio=31 tid=0x00007f85f4806800 nid=0x2503 runnable "GC task thread#1 (ParallelGC)" os_prio=31 tid=0x00007f85f5012000 nid=0x2703 runnable "GC task thread#2 (ParallelGC)" os_prio=31 tid=0x00007f85f5013000 nid=0x2903 runnable "GC task thread#3 (ParallelGC)" os_prio=31 tid=0x00007f85f6000000 nid=0x2b03 runnable "GC task thread#4 (ParallelGC)" os_prio=31 tid=0x00007f85f6001000 nid=0x2d03 runnable "GC task thread#5 (ParallelGC)" os_prio=31 tid=0x00007f85f6001800 nid=0x2f03 runnable "GC task thread#6 (ParallelGC)" os_prio=31 tid=0x00007f85f6002000 nid=0x3103 runnable "GC task thread#7 (ParallelGC)" os_prio=31 tid=0x00007f85f6002800 nid=0x3303 runnable "VM Periodic Task Thread" os_prio=31 tid=0x00007f85f4838000 nid=0x5703 waiting on condition JNI global references: 284
ヒストグラム表示
jcmd <pid> GC.class_histogram
GC.class_histogramで対象プロセスのヒストグラムを表示
$ jcmd 75019 GC.class_histogram 75019: num #instances #bytes class name ---------------------------------------------- 1: 39952 6838208 [C 2: 16004 1408352 java.lang.reflect.Method 3: 38902 933648 java.lang.String 4: 6166 687952 java.lang.Class 5: 16509 528288 java.util.concurrent.ConcurrentHashMap$Node 6: 8504 340160 java.util.LinkedHashMap$Entry 7: 5642 306936 [Ljava.lang.Object; 8: 13221 289608 [Ljava.lang.Class; 9: 3563 268144 [Ljava.util.HashMap$Node; 10: 8376 268032 java.util.HashMap$Node 11: 4161 233016 java.util.LinkedHashMap 12: 1198 221696 [B 13: 2346 168912 java.lang.reflect.Field 14: 125 164288 [Ljava.util.concurrent.ConcurrentHashMap$Node; 15: 9511 152176 java.lang.Object 16: 1807 115384 [Ljava.lang.reflect.Method; 17: 1251 100080 java.lang.reflect.Constructor 18: 2449 95224 [I 19: 2052 93800 [Ljava.lang.String; 20: 3669 88056 org.springframework.core.MethodClassKey 21: 1935 77400 java.lang.ref.SoftReference 22: 781 74976 org.springframework.beans.GenericTypeAwarePropertyDescriptor 23: 1233 69048 java.lang.Class$ReflectionData 24: 1854 59328 java.util.LinkedList 25: 1846 59072 java.lang.ref.WeakReference 26: 1230 59040 java.util.HashMap 27: 2191 52584 java.util.ArrayList 28: 1201 48040 java.util.TreeMap$Entry 29: 1980 47520 java.beans.MethodRef 30: 894 42912 org.apache.tomcat.util.modeler.AttributeInfo ： ： ： ： 2420: 1 16 sun.reflect.GeneratedMethodAccessor9 2421: 1 16 sun.reflect.GeneratedSerializationConstructorAccessor1 2422: 1 16 sun.reflect.GeneratedSerializationConstructorAccessor2 2423: 1 16 sun.reflect.GeneratedSerializationConstructorAccessor3 2424: 1 16 sun.reflect.ReflectionFactory 2425: 1 16 sun.reflect.generics.tree.BooleanSignature 2426: 1 16 sun.reflect.generics.tree.BottomSignature 2427: 1 16 sun.reflect.generics.tree.ByteSignature 2428: 1 16 sun.reflect.generics.tree.CharSignature 2429: 1 16 sun.reflect.generics.tree.IntSignature 2430: 1 16 sun.reflect.generics.tree.VoidDescriptor 2431: 1 16 sun.security.provider.NativePRNG 2432: 1 16 sun.security.util.AlgorithmDecomposer 2433: 1 16 sun.security.util.DisabledAlgorithmConstraints$Constraints 2434: 1 16 sun.util.calendar.Gregorian 2435: 1 16 sun.util.locale.provider.AuxLocaleProviderAdapter$NullProvider 2436: 1 16 sun.util.locale.provider.CalendarDataUtility$CalendarWeekParameterGetter 2437: 1 16 sun.util.locale.provider.SPILocaleProviderAdapter 2438: 1 16 sun.util.locale.provider.TimeZoneNameUtility$TimeZoneNameGetter 2439: 1 16 sun.util.resources.LocaleData 2440: 1 16 sun.util.resources.LocaleData$LocaleDataResourceBundleControl Total 257317 15606072
jmap -histo:live <pid>
jmapでは-histoオプションでヒストグラムを取得します。
liveオプションで生存中のオブジェクトのみカウントされ、jcmdでのヒストグラム取得結果と同じになります。
$ jmap -histo:live 75019 num #instances #bytes class name ---------------------------------------------- 1: 39952 6838208 [C 2: 16004 1408352 java.lang.reflect.Method 3: 38902 933648 java.lang.String 4: 6166 687952 java.lang.Class 5: 16509 528288 java.util.concurrent.ConcurrentHashMap$Node 6: 8504 340160 java.util.LinkedHashMap$Entry 7: 5642 306936 [Ljava.lang.Object; 8: 13221 289608 [Ljava.lang.Class; 9: 3563 268144 [Ljava.util.HashMap$Node; 10: 8376 268032 java.util.HashMap$Node 11: 4161 233016 java.util.LinkedHashMap 12: 1198 221696 [B 13: 2346 168912 java.lang.reflect.Field 14: 125 164288 [Ljava.util.concurrent.ConcurrentHashMap$Node; 15: 9511 152176 java.lang.Object 16: 1807 115384 [Ljava.lang.reflect.Method; 17: 1251 100080 java.lang.reflect.Constructor 18: 2449 95224 [I 19: 2052 93800 [Ljava.lang.String; 20: 3669 88056 org.springframework.core.MethodClassKey 21: 1935 77400 java.lang.ref.SoftReference 22: 781 74976 org.springframework.beans.GenericTypeAwarePropertyDescriptor 23: 1233 69048 java.lang.Class$ReflectionData 24: 1854 59328 java.util.LinkedList 25: 1846 59072 java.lang.ref.WeakReference 26: 1230 59040 java.util.HashMap 27: 2191 52584 java.util.ArrayList 28: 1201 48040 java.util.TreeMap$Entry 29: 1980 47520 java.beans.MethodRef 30: 894 42912 org.apache.tomcat.util.modeler.AttributeInfo ： ： ： ： 2420: 1 16 sun.reflect.GeneratedMethodAccessor9 2421: 1 16 sun.reflect.GeneratedSerializationConstructorAccessor1 2422: 1 16 sun.reflect.GeneratedSerializationConstructorAccessor2 2423: 1 16 sun.reflect.GeneratedSerializationConstructorAccessor3 2424: 1 16 sun.reflect.ReflectionFactory 2425: 1 16 sun.reflect.generics.tree.BooleanSignature 2426: 1 16 sun.reflect.generics.tree.BottomSignature 2427: 1 16 sun.reflect.generics.tree.ByteSignature 2428: 1 16 sun.reflect.generics.tree.CharSignature 2429: 1 16 sun.reflect.generics.tree.IntSignature 2430: 1 16 sun.reflect.generics.tree.VoidDescriptor 2431: 1 16 sun.security.provider.NativePRNG 2432: 1 16 sun.security.util.AlgorithmDecomposer 2433: 1 16 sun.security.util.DisabledAlgorithmConstraints$Constraints 2434: 1 16 sun.util.calendar.Gregorian 2435: 1 16 sun.util.locale.provider.AuxLocaleProviderAdapter$NullProvider 2436: 1 16 sun.util.locale.provider.CalendarDataUtility$CalendarWeekParameterGetter 2437: 1 16 sun.util.locale.provider.SPILocaleProviderAdapter 2438: 1 16 sun.util.locale.provider.TimeZoneNameUtility$TimeZoneNameGetter 2439: 1 16 sun.util.resources.LocaleData 2440: 1 16 sun.util.resources.LocaleData$LocaleDataResourceBundleControl Total 257317 15606072
ヒープダンプ取得
jcmd <pid> GC.heap_dump <dump_file_name>
GC.heap_dumpで対象プロセスのヒープダンプ取得
$ jcmd 75019 GC.heap_dump jcmd_heap_dump.hprof 75019: Heap dump file created
ファイル名だけ指定すると出力場所はプロジェクト直下になってしまった。
$ find ./ -name 'jcmd_heap_dump.hprof' ./Desktop/my_git/spring_examples/transaction-propagation-example/jcmd_heap_dump.hprof
ファイル名をフルパスで指定する必要がある。
カレントディレクトリを指定。
$ jcmd 75019 GC.heap_dump /Users/abcdefg/jcmd_heap_dump.hprof 75019: Heap dump file created
カレントディレクトリに出力された。
$ find ./ -name 'jcmd_heap_dump.hprof' ./jcmd_heap_dump.hprof
jmap -dump:live,format=b,file=<dump_file_name> <pid>
jmapでは-dumpオプションでヒープダンプが取得出来る。
format=bオプションでバイナリで出力され、liveオプションで生存中のオブジェクトのみカウントされる。
$ jmap -dump:live,format=b,file=jmap_heap_dump.hprof 75019 Dumping heap to /Users/abcdefg/jmap_heap_dump.hprof ... Heap dump file created
出力場所はカレントディレクトリ
$ find ./ -name 'jmap_heap_dump.hprof' ./jmap_heap_dump.hprof
ヤマダマンさんにliveオプションについて教えてもらったので、修正しました。
よく使いそうなのが、いい感じにまとまってますねー。
— ヤマダマン (@yamadamn) 2017年9月28日
念のためですが、jmap -histoとかjmap -dumpは、:liveつけないとjcmdのそれらと等価になりませんので、ご注意を。(逆にjcmdでオプションつけることもできます)
終わり。
