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< li class = "toctree-l4" > < a class = "reference internal" href = "#n" > 支持一键展示当前最忙的前N个线程并打印堆栈： < / a > < / li >
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< span id = "thread" > < / span > < h1 > thread< a class = "headerlink" href = "#thread" title = "永久链接至标题" > ¶< / a > < / h1 >
< blockquote >
< div > 查看当前线程信息，查看线程的堆栈< / div > < / blockquote >
< div class = "section" id = "" >
< span id = "id1" > < / span > < h2 > 参数说明< a class = "headerlink" href = "#" title = "永久链接至标题" > ¶< / a > < / h2 >
< table border = "1" class = "docutils" >
< thead >
< tr >
< th align = "right" > 参数名称< / th >
< th align = "left" > 参数说明< / th >
< / tr >
< / thead >
< tbody >
< tr >
< td align = "right" > < em > id< / em > < / td >
< td align = "left" > 线程id< / td >
< / tr >
< tr >
< td align = "right" > [n:]< / td >
< td align = "left" > 指定最忙的前N个线程并打印堆栈< / td >
< / tr >
< tr >
< td align = "right" > [b]< / td >
< td align = "left" > 找出当前阻塞其他线程的线程< / td >
< / tr >
< tr >
< td align = "right" > [i < code > < value> < / code > ]< / td >
< td align = "left" > 指定cpu占比统计的采样间隔， < / td >
< / tr >
< / tbody >
< / table > < blockquote >
< div > cpu占比是如何统计出来的？ < / div > < / blockquote >
< blockquote >
< div > 这里的cpu统计的是， ， ：
首先进行一次采样， < tt class = "docutils literal" > java.lang.management.ThreadMXBean#getThreadCpuTime< / tt > 这个接口)， ， ， < tt class = "docutils literal" > -i< / tt > 参数指定， ， ， < / div > < / blockquote >
< blockquote >
< div > 注意： 这个统计也会产生一定的开销（ ） ， ， ， ， < / div > < / blockquote >
< blockquote >
< div > 如果想看从Java进程启动开始到现在的cpu占比情况： < a class = "reference external" href = "https://github.com/oldratlee/useful-scripts/blob/master/docs/java.md#-show-busy-java-threads" > show-busy-java-threads< / a > 这个脚本< / div > < / blockquote >
< / div >
< div class = "section" id = "" >
< span id = "id2" > < / span > < h2 > 使用参考< a class = "headerlink" href = "#" title = "永久链接至标题" > ¶< / a > < / h2 >
< div class = "section" id = "n" >
< span id = "n" > < / span > < h3 > 支持一键展示当前最忙的前N个线程并打印堆栈： < a class = "headerlink" href = "#n" title = "永久链接至标题" > ¶< / a > < / h3 >
< div class = "highlight-shell notranslate" > < div class = "highlight hljs" > < pre class = "shell" > $ thread -n 3
" as-command-execute-daemon" Id=29 cpuUsage=75% RUNNABLE
at sun.management.ThreadImpl.dumpThreads0(Native Method)
at sun.management.ThreadImpl.getThreadInfo(ThreadImpl.java:440)
at com.taobao.arthas.core.command.monitor200.ThreadCommand$1.action(ThreadCommand.java:58)
at com.taobao.arthas.core.command.handler.AbstractCommandHandler.execute(AbstractCommandHandler.java:238)
at com.taobao.arthas.core.command.handler.DefaultCommandHandler.handleCommand(DefaultCommandHandler.java:67)
at com.taobao.arthas.core.server.ArthasServer$4.run(ArthasServer.java:276)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
Number of locked synchronizers = 1
- java.util.concurrent.ThreadPoolExecutor$Worker@6cd0b6f8
" as-session-expire-daemon" Id=25 cpuUsage=24% TIMED_WAITING
at java.lang.Thread.sleep(Native Method)
at com.taobao.arthas.core.server.DefaultSessionManager$2.run(DefaultSessionManager.java:85)
" Reference Handler" Id=2 cpuUsage=0% WAITING on java.lang.ref.Reference$Lock@69ba0f27
at java.lang.Object.wait(Native Method)
- waiting on java.lang.ref.Reference$Lock@69ba0f27
at java.lang.Object.wait(Object.java:503)
at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:133)
< / pre > < / div >
< / div >
< / div >
< div class = "section" id = "" >
< span id = "id3" > < / span > < h3 > 当没有参数时，显示所有线程的信息。< a class = "headerlink" href = "#" title = "永久链接至标题" > ¶< / a > < / h3 >
< div class = "highlight-shell notranslate" > < div class = "highlight hljs" > < pre class = "shell" > $ thread
Threads Total: 16, NEW: 0, RUNNABLE: 7, BLOCKED: 0, WAITING: 5, TIMED_WAITING: 4, TERMINATED: 0
ID NAME GROUP PRIORITY STATE %CPU TIME INTERRUPTE DAEMON
30 as-command-execute-daemon system 9 RUNNABLE 72 0:0 false true
23 as-session-expire-daemon system 9 TIMED_WAIT 27 0:0 false true
22 Attach Listener system 9 RUNNABLE 0 0:0 false true
11 pool-2-thread-1 main 5 TIMED_WAIT 0 0:0 false false
12 Thread-2 main 5 RUNNABLE 0 0:0 false true
13 pool-3-thread-1 main 5 TIMED_WAIT 0 0:0 false false
25 as-selector-daemon system 9 RUNNABLE 0 0:0 false true
14 Thread-3 main 5 TIMED_WAIT 0 0:0 false false
26 pool-5-thread-1 system 5 WAITING 0 0:0 false false
15 Thread-4 main 5 RUNNABLE 0 0:0 false false
1 main main 5 WAITING 0 0:2 false false
2 Reference Handler system 10 WAITING 0 0:0 false true
3 Finalizer system 8 WAITING 0 0:0 false true
4 Signal Dispatcher system 9 RUNNABLE 0 0:0 false true
20 NonBlockingInputStreamThread main 5 WAITING 0 0:0 false true
21 Thread-8 main 5 RUNNABLE 0 0:0 false true
< / pre > < / div >
< / div >
< / div >
< div class = "section" id = "thread-id" >
< span id = "thread-id" > < / span > < h3 > thread id， < a class = "headerlink" href = "#thread-id" title = "永久链接至标题" > ¶< / a > < / h3 >
< div class = "highlight-shell notranslate" > < div class = "highlight hljs" > < pre class = "shell" > $ thread 1
" main" Id=1 WAITING on java.util.concurrent.CountDownLatch$Sync@29fafb28
at sun.misc.Unsafe.park(Native Method)
- waiting on java.util.concurrent.CountDownLatch$Sync@29fafb28
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
at java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:997)
at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1304)
at java.util.concurrent.CountDownLatch.await(CountDownLatch.java:231)
< / pre > < / div >
< / div >
< / div >
< div class = "section" id = "thread-b" >
< span id = "thread-b" > < / span > < h3 > thread -b, 找出当前阻塞其他线程的线程< a class = "headerlink" href = "#thread-b" title = "永久链接至标题" > ¶< / a > < / h3 >
< p > 有时候我们发现应用卡住了， 通常是由于某个线程拿住了某个锁， 并且其他线程都在等待这把锁造成的。 为了排查这类问题， arthas提供了< tt class = "docutils literal" > thread -b< / tt > ， < / p >
< div class = "highlight-bash notranslate" > < div class = "highlight hljs" > < pre class = "bash" > $ thread -b
" http-bio-8080-exec-4" Id=27 TIMED_WAITING
at java.lang.Thread.sleep(Native Method)
at test.arthas.TestThreadBlocking.doGet(TestThreadBlocking.java:22)
- locked java.lang.Object@725be470 < ---- but blocks 4 other threads!
at javax.servlet.http.HttpServlet.service(HttpServlet.java:624)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at test.filter.TestDurexFilter.doFilter(TestDurexFilter.java:46)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
at com.taobao.tomcat.valves.ContextLoadFilterValve$FilterChainAdapter.doFilter(ContextLoadFilterValve.java:191)
at com.taobao.eagleeye.EagleEyeFilter.doFilter(EagleEyeFilter.java:81)
at com.taobao.tomcat.valves.ContextLoadFilterValve.invoke(ContextLoadFilterValve.java:150)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:429)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1085)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:625)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:318)
- locked org.apache.tomcat.util.net.SocketWrapper@7127ee12
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)
Number of locked synchronizers = 1
- java.util.concurrent.ThreadPoolExecutor$Worker@31a6493e
< / pre > < / div >
< / div >
< blockquote >
< div > 注意， 目前只支持找出synchronized关键字阻塞住的线程， < tt class = "docutils literal" > java.util.concurrent.Lock< / tt > ， < / div > < / blockquote >
< / div >
< div class = "section" id = "thread-i" >
< span id = "thread-i" > < / span > < h3 > thread -i, 指定采样时间间隔< a class = "headerlink" href = "#thread-i" title = "永久链接至标题" > ¶< / a > < / h3 >
< div class = "highlight-bash notranslate" > < div class = "highlight hljs" > < pre class = "bash" > $ thread -n 3 -i 1000
" as-command-execute-daemon" Id=4759 cpuUsage=23% RUNNABLE
at sun.management.ThreadImpl.dumpThreads0(Native Method)
at sun.management.ThreadImpl.getThreadInfo(ThreadImpl.java:440)
at com.taobao.arthas.core.command.monitor200.ThreadCommand.processTopBusyThreads(ThreadCommand.java:133)
at com.taobao.arthas.core.command.monitor200.ThreadCommand.process(ThreadCommand.java:79)
at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl.process(AnnotatedCommandImpl.java:96)
at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl.access$100(AnnotatedCommandImpl.java:27)
at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl$ProcessHandler.handle(AnnotatedCommandImpl.java:125)
at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl$ProcessHandler.handle(AnnotatedCommandImpl.java:122)
at com.taobao.arthas.core.shell.system.impl.ProcessImpl$CommandProcessTask.run(ProcessImpl.java:332)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:756)
Number of locked synchronizers = 1
- java.util.concurrent.ThreadPoolExecutor$Worker@546aeec1
...
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