jvm-jstack的各種用法

jstack 是一個常用的用于分析 Java 進程的工具。它可以顯示 Java 進程中所有線程狀態(tài)和堆棧信息，幫助定位 Java 進程中的問題。以下是一些 jstack 常用的用法示例：

1.分析 Java 進程線程信息

使用 jstack 工具分析正在運行的 Java 應用程序的線程信息。

jstack -F <pid> > <file>

1.獲取死鎖信息

使用 jstack 工具獲取 Java 進程的死鎖信息。

jstack -F -l <pid> > <file>

1.分析線程的鎖狀態(tài)

使用 jstack 工具分析 Java 進程線程的鎖狀態(tài)。

jstack -m <pid>

1.分析某個線程的堆棧信息

使用 jstack 工具分析 Java 進程中某個線程的堆棧信息。

jstack -l <pid> | grep <thread_name>

1.遠程獲取Java進程線程信息

使用 jstack 工具遠程獲取正在運行的 Java 應用程序的線程信息。

jstack -F <hostname>:<port> <pid> > <file>

1.其他用法

除了上述常見用法外，jstack 還可以使用 "-h" 或 "--help" 參數顯示幫助信息，并提供一些額外的參數來控制 jstack 工具的行為，例如：

• "-Joption"：傳遞 Java 虛擬機選項給 jstack
• "-t"：同時顯示線程狀態(tài)
• "-l"：顯示更多關于鎖的信息
• "-e"：打印線程池的信息
• "-c"：打印線程的 Java 堆棧，以及展開受重載的方法

上述示例中的 是進程 ID， 是將輸出保存到的文件名， 和 是正在運行 Java 進程的機器地址和端口號， 是要獲取堆棧信息的線程名稱。

JVM之jstack的使用和解析

基本概念

有些時候我們需要查看下jvm中的線程執(zhí)行情況，比如，發(fā)現服務器的CPU的負載突然增高了、出現了死鎖、死循環(huán)等，我們該如何分析呢？
由于程序是正常運行的，沒有任何的輸出，從日志方面也看不出什么問題，所以就需要看下jvm的內部線程的執(zhí)行情況，然后再進行分析查找出原因。
這個時候，就需要借助于jstack命令了，jstack的作用是將正在運行的jvm的線程情況進行快照，并且打印出來。
jstack是jdk自帶的線程堆棧分析工具，使用該命令可以查看或導出 java 應用程序中線程堆棧信息。
jstack用于生成java虛擬機當前時刻的線程快照。線程快照是當前java虛擬機內每一條線程正在執(zhí)行的方法堆棧的集合，生成線程快照的主要目的是定位線程出現長時間停頓的原因，如線程間死鎖、死循環(huán)、請求外部資源導致的長時間等待等。 線程出現停頓的時候通過jstack來查看各個線程的調用堆棧，就可以知道沒有響應的線程到底在后臺做什么事情，或者等待什么資源。 如果java程序崩潰生成core文件，jstack工具可以用來獲得core文件的java stack和native stack的信息，從而可以輕松地知道java程序是如何崩潰和在程序何處發(fā)生問題。另外，jstack工具還可以附屬到正在運行的java程序中，看到當時運行的java程序的java stack和native stack的信息, 如果現在運行的java程序呈現hung的狀態(tài)，jstack是非常有用的。

用法：

jstack [ options ] pid

pid：Java進程的ID，可以通過jps命令查詢到。

jstack [ options ] executable core

executable： 產生core dump的Java可執(zhí)行程序
core：要打印的堆棧跟蹤的核心文件

jstack [ options ] [ server-id@ ] remote-hostname-or-IP

server-id：當多個DEBUG服務器在同一遠程主機上運行時，可使用的可選唯一ID。
remote-hostname-or-IP：遠程DEBUG的服務器主機名或IP地址

options 參數說明

-F

當 jstack [-l] pid 沒有響應時，強制打印一個堆棧轉儲。

-l

打印關于鎖的其他信息，比如擁有的java.util.concurrent ownable同步器的列表。

-m

打印包含Java和本機C/ C++幀的混合模式堆棧跟蹤。

-h

打印幫助信息

-help

打印幫助信息

[root@fsd bin]# jstack 2203
Full thread dump Java HotSpot(TM) 64‐Bit Server VM (25.141‐b15 mixed mode):
"Attach Listener" #24 daemon prio=9 os_prio=0 tid=0x00007fabb4001000 nid=0x906 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE

"http‐bio‐8080‐exec‐5" #23 daemon prio=5 os_prio=0 tid=0x00007fabb057c000 nid=0x8e1 waiting on condition [0x00007fabd05b8000]
java.lang.Thread.State: WAITING (parking) at sun.misc.Unsafe.park(Native Method)
‐ parking to wait for    <0x00000000f8508360> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175) at
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awa it(AbstractQueuedSynchronizer.java:2039)
at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:44 2)
at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:104) at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:32) at
java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1 074)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java
:1134)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.jav a:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread
.java:61)
at java.lang.Thread.run(Thread.java:748)
"http‐bio‐8080‐exec‐4" #22 daemon prio=5 os_prio=0 tid=0x00007fab9c113800

nid=0x8e0 waiting on condition [0x00007fabd06b9000] java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
‐ parking to wait for    <0x00000000f8508360> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175) at
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awa it(AbstractQueuedSynchronizer.java:2039)
at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:44 2)
at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:104) at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:32) at
java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1 074)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java
:1134)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.jav a:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread
.java:61)
at java.lang.Thread.run(Thread.java:748)

"http‐bio‐8080‐exec‐3" #21 daemon prio=5 os_prio=0 tid=0x0000000001aeb800 nid=0x8df waiting on condition [0x00007fabd09ba000]
java.lang.Thread.State: WAITING (parking) at sun.misc.Unsafe.park(Native Method)
‐ parking to wait for    <0x00000000f8508360> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175) at
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awa it(AbstractQueuedSynchronizer.java:2039)
at

java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:44 2)
at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:104) at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:32) at
java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1 074)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java
:1134)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.jav a:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread
.java:61)
at java.lang.Thread.run(Thread.java:748)

"http‐bio‐8080‐exec‐2" #20 daemon prio=5 os_prio=0 tid=0x0000000001aea000 nid=0x8de waiting on condition [0x00007fabd0abb000]
java.lang.Thread.State: WAITING (parking) at sun.misc.Unsafe.park(Native Method)
‐ parking to wait for    <0x00000000f8508360> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175) at
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awa it(AbstractQueuedSynchronizer.java:2039)
at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:44 2)
at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:104) at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:32) at
java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1 074)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java
:1134)

java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.jav a:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread
.java:61)
at java.lang.Thread.run(Thread.java:748)

"http‐bio‐8080‐exec‐1" #19 daemon prio=5 os_prio=0 tid=0x0000000001ae8800 nid=0x8dd waiting on condition [0x00007fabd0bbc000]
java.lang.Thread.State: WAITING (parking) at sun.misc.Unsafe.park(Native Method)
‐ parking to wait for    <0x00000000f8508360> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175) at
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awa it(AbstractQueuedSynchronizer.java:2039)
at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:44 2)
at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:104) at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:32) at
java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1 074)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java
:1134)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.jav a:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread
.java:61)
at java.lang.Thread.run(Thread.java:748)

"ajp‐bio‐8009‐AsyncTimeout" #17 daemon prio=5 os_prio=0 tid=0x00007fabe8128000 nid=0x8d0 waiting on condition [0x00007fabd0ece000]
java.lang.Thread.State: TIMED_WAITING (sleeping) at java.lang.Thread.sleep(Native Method)

at org.apache.tomcat.util.net.JIoEndpoint$AsyncTimeout.run(JIoEndpoint.java: 152)
at java.lang.Thread.run(Thread.java:748)

"ajp‐bio‐8009‐Acceptor‐0" #16 daemon prio=5 os_prio=0 tid=0x00007fabe82d4000 nid=0x8cf runnable [0x00007fabd0fcf000]
java.lang.Thread.State: RUNNABLE
at java.net.PlainSocketImpl.socketAccept(Native Method) at
java.net.AbstractPlainSocketImpl.accept(AbstractPlainSocketImpl.java:409) at java.net.ServerSocket.implAccept(ServerSocket.java:545)
at java.net.ServerSocket.accept(ServerSocket.java:513) at
org.apache.tomcat.util.net.DefaultServerSocketFactory.acceptSocket(Defaul tServerSocketFactory.java:60)
at org.apache.tomcat.util.net.JIoEndpoint$Acceptor.run(JIoEndpoint.java:220)
at java.lang.Thread.run(Thread.java:748)

"http‐bio‐8080‐AsyncTimeout" #15 daemon prio=5 os_prio=0 tid=0x00007fabe82d1800 nid=0x8ce waiting on condition [0x00007fabd10d0000]
java.lang.Thread.State: TIMED_WAITING (sleeping) at java.lang.Thread.sleep(Native Method)
at org.apache.tomcat.util.net.JIoEndpoint$AsyncTimeout.run(JIoEndpoint.java: 152)
at java.lang.Thread.run(Thread.java:748)

"http‐bio‐8080‐Acceptor‐0" #14 daemon prio=5 os_prio=0 tid=0x00007fabe82d0000 nid=0x8cd runnable [0x00007fabd11d1000]
java.lang.Thread.State: RUNNABLE
at java.net.PlainSocketImpl.socketAccept(Native Method) at
java.net.AbstractPlainSocketImpl.accept(AbstractPlainSocketImpl.java:409) at java.net.ServerSocket.implAccept(ServerSocket.java:545)
at java.net.ServerSocket.accept(ServerSocket.java:513)

at

org.apache.tomcat.util.net.DefaultServerSocketFactory.acceptSocket(Defaul tServerSocketFactory.java:60)
at org.apache.tomcat.util.net.JIoEndpoint$Acceptor.run(JIoEndpoint.java:220)
at java.lang.Thread.run(Thread.java:748)

"ContainerBackgroundProcessor[StandardEngine[Catalina]]" #13 daemon prio=5 os_prio=0 tid=0x00007fabe82ce000 nid=0x8cc waiting on condition [0x00007fabd12d2000]
java.lang.Thread.State: TIMED_WAITING (sleeping) at java.lang.Thread.sleep(Native Method)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(C ontainerBase.java:1513)
at java.lang.Thread.run(Thread.java:748)

"GC Daemon" #10 daemon prio=2 os_prio=0 tid=0x00007fabe83b4000 nid=0x8b3 in Object.wait() [0x00007fabd1c2f000]
java.lang.Thread.State: TIMED_WAITING (on object monitor) at java.lang.Object.wait(Native Method)
‐ waiting on <0x00000000e315c2d0> (a sun.misc.GC$LatencyLock) at sun.misc.GC$Daemon.run(GC.java:117)
‐ locked <0x00000000e315c2d0> (a sun.misc.GC$LatencyLock)

"Service Thread" #7 daemon prio=9 os_prio=0 tid=0x00007fabe80c3800 nid=0x8a5 runnable [0x0000000000000000]
java.lang.Thread.State: RUNNABLE

"C1 CompilerThread1" #6 daemon prio=9 os_prio=0 tid=0x00007fabe80b6800 nid=0x8a4 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE

"C2 CompilerThread0" #5 daemon prio=9 os_prio=0 tid=0x00007fabe80b3800 nid=0x8a3 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE

"Signal Dispatcher" #4 daemon prio=9 os_prio=0 tid=0x00007fabe80b2000 nid=0x8a2 runnable [0x0000000000000000]
java.lang.Thread.State: RUNNABLE

"Finalizer" #3 daemon prio=8 os_prio=0 tid=0x00007fabe807f000 nid=0x8a1

in Object.wait() [0x00007fabd2a67000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method)
‐ waiting on <0x00000000e3162918> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:143)
‐ locked <0x00000000e3162918> (a java.lang.ref.ReferenceQueue$Lock) at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:164)
at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:209)

"Reference Handler" #2 daemon prio=10 os_prio=0 tid=0x00007fabe807a800 nid=0x8a0 in Object.wait() [0x00007fabd2b68000]
java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method)
‐ waiting on <0x00000000e3162958> (a java.lang.ref.Reference$Lock) at java.lang.Object.wait(Object.java:502)
at java.lang.ref.Reference.tryHandlePending(Reference.java:191)
‐ locked <0x00000000e3162958> (a java.lang.ref.Reference$Lock)
at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:153)

"main" #1 prio=5 os_prio=0 tid=0x00007fabe8009000 nid=0x89c runnable [0x00007fabed210000]
java.lang.Thread.State: RUNNABLE
at java.net.PlainSocketImpl.socketAccept(Native Method) at
java.net.AbstractPlainSocketImpl.accept(AbstractPlainSocketImpl.java:409) at java.net.ServerSocket.implAccept(ServerSocket.java:545)
at java.net.ServerSocket.accept(ServerSocket.java:513) at
org.apache.catalina.core.StandardServer.await(StandardServer.java:453) at org.apache.catalina.startup.Catalina.await(Catalina.java:777) at org.apache.catalina.startup.Catalina.start(Catalina.java:723) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java
:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorI mpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)

at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:321)

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