jps,jstack,jheap,jhat(原创)

xiaoxiao2021-03-01  10

# 1、查看当前系统运行的 java 程序(简略)

jps -l

632 

6328 sun.tools.jps.Jps

# 2、查看当前系统运行的 java 程序(详细)
jps -lmvV

632  -Dosgi.requiredJavaVersion=1.8 -Dosgi.instance.area.default=@user.home/eclipse-workspace -XX:+UseG1GC -XX:+UseStringDeduplication -XstartOnFirstThread -Dorg.eclipse.swt.internal.carbon.smallFonts -Dosgi.requiredJavaVersion=1.8 -Xms256m -Xmx1024m -Xdock:icon=../Resources/Eclipse.icns -XstartOnFirstThread -Dorg.eclipse.swt.internal.carbon.smallFonts -Declipse.p2.max.threads=10 -Doomph.update.url=http://download.eclipse.org/oomph/updates/milestone/latest -Doomph.redirection.index.redirection=index:/->http://git.eclipse.org/c/oomph/org.eclipse.oomph.git/plain/setups/

6335 sun.tools.jps.Jps -lmvV -Dapplication.home=/Library/Java/JavaVirtualMachines/jdk1.8.0_131.jdk/Contents/Home -Xms8m

# 3、查看java进程的线程执行状态jstack -l 632

2018-05-24 17:20:58

Full thread dump Java HotSpot(TM) 64-Bit Server VM (25.131-b11 mixed mode):

"Attach Listener" #24 daemon prio=9 os_prio=31 tid=0x00007f85590a9000 nid=0x12913 waiting on condition [0x0000000000000000]

   java.lang.Thread.State: RUNNABLE

   Locked ownable synchronizers:

- None

"logback configurator timer" #19 daemon prio=5 os_prio=31 tid=0x00007f8557a0b000 nid=0x1070b in Object.wait() [0x0000700011e05000]

   java.lang.Thread.State: TIMED_WAITING (on object monitor)

at java.lang.Object.wait(Native Method)

at java.util.TimerThread.mainLoop(Timer.java:552)

- locked <0x0000000786c51310> (a java.util.TaskQueue)

at java.util.TimerThread.run(Timer.java:505)

   Locked ownable synchronizers:

- None

"EMF Reference Cleaner" #18 daemon prio=5 os_prio=31 tid=0x00007f8556a3c800 nid=0x11a27 in Object.wait() [0x0000700011d02000]

   java.lang.Thread.State: WAITING (on object monitor)

at java.lang.Object.wait(Native Method)

- waiting on <0x0000000786b047e8> (a java.lang.ref.ReferenceQueue$Lock)

at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:143)

- locked <0x0000000786b047e8> (a java.lang.ref.ReferenceQueue$Lock)

at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:164)

at org.eclipse.emf.common.util.CommonUtil$1ReferenceClearingQueuePollingThread.run(CommonUtil.java:70)

   Locked ownable synchronizers:

- None

"Worker-JM" #17 prio=5 os_prio=31 tid=0x00007f855a214000 nid=0x11237 in Object.wait() [0x0000700011bff000]

   java.lang.Thread.State: WAITING (on object monitor)

at java.lang.Object.wait(Native Method)

- waiting on <0x0000000786904e30> (a java.util.ArrayList)

at org.eclipse.core.internal.jobs.InternalWorker.run(InternalWorker.java:59)

- locked <0x0000000786904e30> (a java.util.ArrayList)

   Locked ownable synchronizers:

- None

"SCR Component Actor" #16 daemon prio=5 os_prio=31 tid=0x00007f855a03f000 nid=0xcc07 in Object.wait() [0x0000700011afc000]

   java.lang.Thread.State: WAITING (on object monitor)

at java.lang.Object.wait(Native Method)

- waiting on <0x0000000786904fc0> (a java.util.LinkedList)

at java.lang.Object.wait(Object.java:502)

at org.apache.felix.scr.impl.ComponentActorThread.run(ComponentActorThread.java:80)

- locked <0x0000000786904fc0> (a java.util.LinkedList)

at java.lang.Thread.run(Thread.java:748)

   Locked ownable synchronizers:

- None

"Framework Event Dispatcher: org.eclipse.osgi.internal.framework.EquinoxEventPublisher@41c89d2f" #15 daemon prio=5 os_prio=31 tid=0x00007f85579d7000 nid=0xca03 in Object.wait() [0x00007000119f9000]

   java.lang.Thread.State: WAITING (on object monitor)

at java.lang.Object.wait(Native Method)

- waiting on <0x0000000786904ff8> (a org.eclipse.osgi.framework.eventmgr.EventManager$EventThread)

at java.lang.Object.wait(Object.java:502)

at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.getNextEvent(EventManager.java:400)

- locked <0x0000000786904ff8> (a org.eclipse.osgi.framework.eventmgr.EventManager$EventThread)

at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.run(EventManager.java:336)

   Locked ownable synchronizers:

- None

"Start Level: Equinox Container: 5d0c2c4a-f591-4e43-8c7e-392bc4862274" #14 daemon prio=5 os_prio=31 tid=0x00007f85590c1800 nid=0xc907 in Object.wait() [0x00007000118f6000]

   java.lang.Thread.State: WAITING (on object monitor)

at java.lang.Object.wait(Native Method)

- waiting on <0x0000000786b04818> (a org.eclipse.osgi.framework.eventmgr.EventManager$EventThread)

at java.lang.Object.wait(Object.java:502)

at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.getNextEvent(EventManager.java:400)

- locked <0x0000000786b04818> (a org.eclipse.osgi.framework.eventmgr.EventManager$EventThread)

at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.run(EventManager.java:336)

   Locked ownable synchronizers:

- None

"Active Thread: Equinox Container: 5d0c2c4a-f591-4e43-8c7e-392bc4862274" #12 prio=5 os_prio=31 tid=0x00007f8557160800 nid=0xc717 waiting on condition [0x00007000117f3000]

   java.lang.Thread.State: TIMED_WAITING (parking)

at sun.misc.Unsafe.park(Native Method)

- parking to wait for  <0x0000000780f588a8> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)

at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)

at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)

at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1093)

at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:809)

at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1067)

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1127)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)

at java.lang.Thread.run(Thread.java:748)

   Locked ownable synchronizers:

- None

"Service Thread" #10 daemon prio=9 os_prio=31 tid=0x00007f85588fe000 nid=0x9303 runnable [0x0000000000000000]

   java.lang.Thread.State: RUNNABLE

   Locked ownable synchronizers:

- None

"C1 CompilerThread3" #9 daemon prio=9 os_prio=31 tid=0x00007f8556812000 nid=0x9103 waiting on condition [0x0000000000000000]

   java.lang.Thread.State: RUNNABLE

   Locked ownable synchronizers:

- None

"C2 CompilerThread2" #8 daemon prio=9 os_prio=31 tid=0x00007f855a001800 nid=0x8f03 waiting on condition [0x0000000000000000]

   java.lang.Thread.State: RUNNABLE

   Locked ownable synchronizers:

- None

"C2 CompilerThread1" #7 daemon prio=9 os_prio=31 tid=0x00007f85588fd800 nid=0x8d03 waiting on condition [0x0000000000000000]

   java.lang.Thread.State: RUNNABLE

   Locked ownable synchronizers:

- None

"C2 CompilerThread0" #6 daemon prio=9 os_prio=31 tid=0x00007f8557815000 nid=0x8b03 waiting on condition [0x0000000000000000]

   java.lang.Thread.State: RUNNABLE

   Locked ownable synchronizers:

- None

"Signal Dispatcher" #5 daemon prio=9 os_prio=31 tid=0x00007f8556811000 nid=0x8903 runnable [0x0000000000000000]

   java.lang.Thread.State: RUNNABLE

   Locked ownable synchronizers:

- None

"Surrogate Locker Thread (Concurrent GC)" #4 daemon prio=9 os_prio=31 tid=0x00007f855a000800 nid=0x8603 waiting on condition [0x0000000000000000]

   java.lang.Thread.State: RUNNABLE

   Locked ownable synchronizers:

- None

"Finalizer" #3 daemon prio=8 os_prio=31 tid=0x00007f8556810800 nid=0x8203 in Object.wait() [0x0000700010bc6000]

   java.lang.Thread.State: WAITING (on object monitor)

at java.lang.Object.wait(Native Method)

- waiting on <0x0000000780a00c08> (a java.lang.ref.ReferenceQueue$Lock)

at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:143)

- locked <0x0000000780a00c08> (a java.lang.ref.ReferenceQueue$Lock)

at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:164)

at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:209)

   Locked ownable synchronizers:

- None

"Reference Handler" #2 daemon prio=10 os_prio=31 tid=0x00007f85588f5000 nid=0x8003 in Object.wait() [0x0000700010ac3000]

   java.lang.Thread.State: WAITING (on object monitor)

at java.lang.Object.wait(Native Method)

at java.lang.Object.wait(Object.java:502)

at java.lang.ref.Reference.tryHandlePending(Reference.java:191)

- locked <0x0000000780a00dc0> (a java.lang.ref.Reference$Lock)

at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:153)

   Locked ownable synchronizers:

- None

"main" #1 prio=6 os_prio=31 tid=0x00007f855a808800 nid=0x307 runnable [0x00007fff54a1d000]

   java.lang.Thread.State: RUNNABLE

at org.eclipse.swt.internal.cocoa.OS.objc_msgSend_bool(Native Method)

at org.eclipse.swt.internal.cocoa.NSRunLoop.runMode(NSRunLoop.java:42)

at org.eclipse.swt.widgets.Display.sleep(Display.java:4830)

at org.eclipse.jface.window.Window.runEventLoop(Window.java:819)

at org.eclipse.jface.window.Window.open(Window.java:794)

at org.eclipse.ui.internal.ide.ChooseWorkspaceDialog.prompt(ChooseWorkspaceDialog.java:114)

at org.eclipse.ui.internal.ide.application.IDEApplication.promptForWorkspace(IDEApplication.java:364)

at org.eclipse.ui.internal.ide.application.IDEApplication.checkInstanceLocation(IDEApplication.java:278)

at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:141)

at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)

at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134)

at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)

at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:388)

at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:243)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:498)

at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:653)

at org.eclipse.equinox.launcher.Main.basicRun(Main.java:590)

at org.eclipse.equinox.launcher.Main.run(Main.java:1499)

   Locked ownable synchronizers:

- None

"VM Thread" os_prio=31 tid=0x00007f85588f0800 nid=0x7e03 runnable 

"Gang worker#0 (Parallel GC Threads)" os_prio=31 tid=0x00007f8558810800 nid=0x5403 runnable 

"Gang worker#1 (Parallel GC Threads)" os_prio=31 tid=0x00007f8558814000 nid=0x5603 runnable 

"Gang worker#2 (Parallel GC Threads)" os_prio=31 tid=0x00007f855881a800 nid=0x5803 runnable 

"Gang worker#3 (Parallel GC Threads)" os_prio=31 tid=0x00007f855881b000 nid=0x5a03 runnable 

"Gang worker#4 (Parallel GC Threads)" os_prio=31 tid=0x00007f855881b800 nid=0x5c03 runnable 

"Gang worker#5 (Parallel GC Threads)" os_prio=31 tid=0x00007f855881c000 nid=0x5e03 runnable 

"Gang worker#6 (Parallel GC Threads)" os_prio=31 tid=0x00007f855881d000 nid=0x6003 runnable 

"Gang worker#7 (Parallel GC Threads)" os_prio=31 tid=0x00007f855881d800 nid=0x6203 runnable 

"G1 Main Concurrent Mark GC Thread" os_prio=31 tid=0x00007f8558833800 nid=0x7603 runnable 

"Gang worker#0 (G1 Parallel Marking Threads)" os_prio=31 tid=0x00007f8559003000 nid=0x7803 runnable 

"Gang worker#1 (G1 Parallel Marking Threads)" os_prio=31 tid=0x00007f855a006800 nid=0x7a03 runnable 

"G1 Concurrent Refinement Thread#0" os_prio=31 tid=0x00007f8558824000 nid=0x7403 runnable 

"G1 Concurrent Refinement Thread#1" os_prio=31 tid=0x00007f8558823800 nid=0x7203 runnable 

"G1 Concurrent Refinement Thread#2" os_prio=31 tid=0x00007f8558822800 nid=0x7003 runnable 

"G1 Concurrent Refinement Thread#3" os_prio=31 tid=0x00007f8558822000 nid=0x6e03 runnable 

"G1 Concurrent Refinement Thread#4" os_prio=31 tid=0x00007f8558821000 nid=0x6c03 runnable 

"G1 Concurrent Refinement Thread#5" os_prio=31 tid=0x00007f8558820800 nid=0x6a03 runnable 

"G1 Concurrent Refinement Thread#6" os_prio=31 tid=0x00007f855881f800 nid=0x6803 runnable 

"G1 Concurrent Refinement Thread#7" os_prio=31 tid=0x00007f855881f000 nid=0x6603 runnable 

"G1 Concurrent Refinement Thread#8" os_prio=31 tid=0x00007f855881e000 nid=0x6403 runnable 

"String Deduplication Thread" os_prio=31 tid=0x00007f85588d7800 nid=0x7c03 runnable 

"VM Periodic Task Thread" os_prio=31 tid=0x00007f855900b800 nid=0x9503 waiting on condition 

JNI global references: 392

# 4、查看分类型的堆统计jmap -heap 632

Attaching to process ID 632, please wait...

Debugger attached successfully.

Server compiler detected.

JVM version is 25.131-b11

using thread-local object allocation.

Garbage-First (G1) GC with 8 thread(s)

Heap Configuration:

   MinHeapFreeRatio         = 40

   MaxHeapFreeRatio         = 70

   MaxHeapSize              = 1073741824 (1024.0MB)

   NewSize                  = 1363144 (1.2999954223632812MB)

   MaxNewSize               = 643825664 (614.0MB)

   OldSize                  = 5452592 (5.1999969482421875MB)

   NewRatio                 = 2

   SurvivorRatio            = 8

   MetaspaceSize            = 21807104 (20.796875MB)

   CompressedClassSpaceSize = 1073741824 (1024.0MB)

   MaxMetaspaceSize         = 17592186044415 MB

   G1HeapRegionSize         = 1048576 (1.0MB)

Heap Usage:

G1 Heap:

   regions  = 1024

   capacity = 1073741824 (1024.0MB)

   used     = 123350528 (117.63623046875MB)

   free     = 950391296 (906.36376953125MB)

   11.487913131713867% used

G1 Young Generation:

Eden Space:

   regions  = 91

   capacity = 162529280 (155.0MB)

   used     = 95420416 (91.0MB)

   free     = 67108864 (64.0MB)

   58.70967741935484% used

Survivor Space:

   regions  = 6

   capacity = 6291456 (6.0MB)

   used     = 6291456 (6.0MB)

   free     = 0 (0.0MB)

   100.0% used

G1 Old Generation:

   regions  = 21

   capacity = 99614720 (95.0MB)

   used     = 21638656 (20.63623046875MB)

   free     = 77976064 (74.36376953125MB)

   21.722347861842106% used

10800 interned Strings occupying 915944 bytes.

# 5、查看基于 classloader 的堆统计jmap -clstats 632

Attaching to process ID 632, please wait...

Debugger attached successfully.

Server compiler detected.

JVM version is 25.131-b11

finding class loader instances ..done.

computing per loader stat ..done.

please wait.. computing liveness.......liveness analysis may be inaccurate ...

class_loader classes bytes parent_loader alive? type

<bootstrap> 1413 2614211   null  live <internal>

0x0000000786c19940 73 139502 0x0000000780a04ed8 live org/eclipse/osgi/internal/loader/EquinoxClassLoader@0x00000007c00b7f50

0x0000000786920a10 0 0 0x0000000780a04ed8 live org/eclipse/osgi/internal/loader/EquinoxClassLoader@0x00000007c00b7f50

0x0000000786c793c0 69 143761 0x0000000780a04ed8 live org/eclipse/osgi/internal/loader/EquinoxClassLoader@0x00000007c00b7f50

0x0000000781400048 69 176221 0x0000000780a04ed8 live org/eclipse/osgi/internal/loader/EquinoxClassLoader@0x00000007c00b7f50

0x0000000786c18dc8 19 38354 0x0000000780a04ed8 live org/eclipse/osgi/internal/loader/EquinoxClassLoader@0x00000007c00b7f50

0x0000000786c191c8 53 109827 0x0000000780a04ed8 live org/eclipse/osgi/internal/loader/EquinoxClassLoader@0x00000007c00b7f50

0x0000000786c1c248 87 204940 0x0000000780a04ed8 live org/eclipse/osgi/internal/loader/EquinoxClassLoader@0x00000007c00b7f50

0x0000000786b4a438 0 0 0x0000000780a04ed8 live org/eclipse/osgi/internal/loader/EquinoxClassLoader@0x00000007c00b7f50

0x0000000786c055d0 11 7916 0x0000000780a04ed8 live org/eclipse/osgi/internal/loader/EquinoxClassLoader@0x00000007c00b7f50

0x0000000786c18550 3 2593 0x0000000780a04ed8 live org/eclipse/osgi/internal/loader/EquinoxClassLoader@0x00000007c00b7f50

0x0000000786c1a2d0 65 118499 0x0000000780a04ed8 live org/eclipse/osgi/internal/loader/EquinoxClassLoader@0x00000007c00b7f50

0x0000000786b49da0 0 0 0x0000000780a04ed8 live org/eclipse/osgi/internal/loader/EquinoxClassLoader@0x00000007c00b7f50

0x0000000786c063d8 184 415436 0x0000000780a04ed8 live org/eclipse/osgi/internal/loader/EquinoxClassLoader@0x00000007c00b7f50

0x0000000786c2c0d8 7 18717 0x0000000780a04ed8 live org/eclipse/osgi/internal/loader/EquinoxClassLoader@0x00000007c00b7f50

0x0000000786c79358 16 38634 0x0000000780a04ed8 live org/eclipse/osgi/internal/loader/EquinoxClassLoader@0x00000007c00b7f50

0x0000000786c05a60 11 12415 0x0000000780a04ed8 live org/eclipse/osgi/internal/loader/EquinoxClassLoader@0x00000007c00b7f50

0x0000000786c2d6e0 223 452432 0x0000000780a04ed8 live org/eclipse/osgi/internal/loader/EquinoxClassLoader@0x00000007c00b7f50

0x0000000786c00168 97 410884 0x0000000780a04ed8 live org/eclipse/osgi/internal/loader/EquinoxClassLoader@0x00000007c00b7f50

0x0000000786c05168 248 826728 0x0000000780a04ed8 live org/eclipse/osgi/internal/loader/EquinoxClassLoader@0x00000007c00b7f50

0x0000000786c15968 33 79295 0x0000000780a04ed8 live org/eclipse/osgi/internal/loader/EquinoxClassLoader@0x00000007c00b7f50

0x0000000786c15e68 60 180492 0x0000000780a04ed8 live org/eclipse/osgi/internal/loader/EquinoxClassLoader@0x00000007c00b7f50

0x0000000786c21be8 97 212559 0x0000000780a04ed8 live org/eclipse/osgi/internal/loader/EquinoxClassLoader@0x00000007c00b7f50

....

total = 73 5103 11314038     N/A    alive=70, dead=3     N/A  

# 6、导出堆的使用状态到一个文件jmap -dump:live,format=b,file=heap.bin 632

jhat heap.bin 

# 分析上面一步导出的堆统计文件

jhat heap.bin 

Reading from heap.bin...

Dump file created Thu May 24 17:41:00 CST 2018

Snapshot read, resolving...

Resolving 269783 objects...

Chasing references, expect 53 dots.....................................................

Eliminating duplicate references.....................................................

Snapshot resolved.

Started HTTP server on port 7000

Server is ready.

# 7、在浏览器中查看堆信息http://127.0.0.1:7000

信息的最后部分,有几个链接,可以点击,从而看到按照不同纬度进行组合、排序的统计。在查看问题的时候,应该很有用。不明白为什么不把这几个链接放在最顶部。

Other Queries

All classes including platformShow all members of the rootsetShow instance counts for all classes (including platform)Show instance counts for all classes (excluding platform)Show heap histogramShow finalizer summaryExecute Object Query Language (OQL) query

例如,点击 Show instance counts for all classes (including platform),能看到各个Class的实例个数,已经按多少降序排好,如:
50719 instances of class java.util.HashMap$Node 29557 instances of class java.lang.String 23679 instances of class [C 14285 instances of class java.util.HashMap 13740 instances of class [Ljava.util.HashMap$Node; 8192 instances of class [Ljava.lang.Object; 7125 instances of class java.util.HashMap$EntrySet 6766 instances of class java.util.HashMap$KeySet 6395 instances of class java.util.Collections$UnmodifiableMap 6240 instances of class java.util.Collections$UnmodifiableSet 6231 instances of class java.util.Collections$UnmodifiableMap$UnmodifiableEntrySet 6076 instances of class java.util.ArrayList 5783 instances of class org.eclipse.osgi.container.ModuleCapability 5645 instances of class org.eclipse.osgi.container.ModuleRequirement 5524 instances of class java.util.HashSet 5194 instances of class java.util.Collections$SingletonSet 5142 instances of class org.eclipse.osgi.container.ModuleWire 3458 instances of class java.lang.Class 3236 instances of class java.lang.Object 2598 instances of class java.util.Collections$SingletonMap 2597 instances of class java.util.AbstractMap$SimpleImmutableEntry 2222 instances of class java.util.Hashtable$Entry 【完】

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