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< p > < a class = "reference external" href = "https://arthas.aliyun.com/doc/arthas-tutorials.html?language=cn&id=command-thread" > < code class = "docutils literal notranslate" > < span class = "pre" > thread< / span > < / code > 在线教程< / a > < / p >
< blockquote >
< div > < p > 查看当前线程信息，查看线程的堆栈< / p >
< / div > < / blockquote >
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< h2 > 参数说明< a class = "headerlink" href = "#id1" title = "永久链接至标题" > ¶< / a > < / h2 >
< table border = "1" class = "docutils" >
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< 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使用率统计的采样间隔， ， < / td >
< / tr >
< tr >
< td align = "right" > [--all]< / td >
< td align = "left" > 显示所有匹配的线程< / td >
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< / tbody >
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< div class = "section" id = "cpu" >
< h2 > cpu使用率是如何统计出来的？ < a class = "headerlink" href = "#cpu" title = "永久链接至标题" > ¶< / a > < / h2 >
< p > 这里的cpu使用率与linux 命令< code class = "docutils literal notranslate" > < span class = "pre" > top< / span > < span class = "pre" > -H< / span > < span class = "pre" > -p< / span > < span class = "pre" > < pid> < / span > < / code > 的线程< code class = "docutils literal notranslate" > < span class = "pre" > %CPU< / span > < / code > 类似， ， < / p >
< div class = "section" id = "id2" >
< h3 > 工作原理说明：< a class = "headerlink" href = "#id2" title = "永久链接至标题" > ¶< / a > < / h3 >
< ul class = "simple" >
< li > < p > 首先第一次采样， < code class = "docutils literal notranslate" > < span class = "pre" > java.lang.management.ThreadMXBean#getThreadCpuTime()< / span > < / code > 及< code class = "docutils literal notranslate" > < span class = "pre" > sun.management.HotspotThreadMBean.getInternalThreadCpuTimes()< / span > < / code > 接口)< / p > < / li >
< li > < p > 然后睡眠等待一个间隔时间（ ， < code class = "docutils literal notranslate" > < span class = "pre" > -i< / span > < / code > 指定间隔时间）< / p > < / li >
< li > < p > 再次第二次采样， ， ， < / p > < / li >
< li > < p > 线程CPU使用率 = 线程增量CPU时间 / 采样间隔时间 * 100%< / p > < / li >
< / ul >
< blockquote >
< div > < p > 注意： 这个统计也会产生一定的开销（ ） ， ， ， ， < / p >
< / div > < / blockquote >
< blockquote >
< div > < p > 另外一种查看Java进程的线程cpu使用率方法： < 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< / p >
< / div > < / blockquote >
< / div >
< / div >
< div class = "section" id = "id3" >
< h2 > 使用参考< a class = "headerlink" href = "#id3" title = "永久链接至标题" > ¶< / a > < / h2 >
< div class = "section" id = "n" >
< 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
" C1 CompilerThread0" [Internal] cpuUsage=1.63% deltaTime=3ms time=1170ms
" arthas-command-execute" Id=23 cpuUsage=0.11% deltaTime=0ms time=401ms RUNNABLE
at java.management@11.0.7/sun.management.ThreadImpl.dumpThreads0(Native Method)
at java.management@11.0.7/sun.management.ThreadImpl.getThreadInfo(ThreadImpl.java:466)
at com.taobao.arthas.core.command.monitor200.ThreadCommand.processTopBusyThreads(ThreadCommand.java:199)
at com.taobao.arthas.core.command.monitor200.ThreadCommand.process(ThreadCommand.java:122)
at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl.process(AnnotatedCommandImpl.java:82)
at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl.access$100(AnnotatedCommandImpl.java:18)
at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl$ProcessHandler.handle(AnnotatedCommandImpl.java:111)
at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl$ProcessHandler.handle(AnnotatedCommandImpl.java:108)
at com.taobao.arthas.core.shell.system.impl.ProcessImpl$CommandProcessTask.run(ProcessImpl.java:385)
at java.base@11.0.7/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
at java.base@11.0.7/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at java.base@11.0.7/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:304)
at java.base@11.0.7/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base@11.0.7/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base@11.0.7/java.lang.Thread.run(Thread.java:834)
" VM Periodic Task Thread" [Internal] cpuUsage=0.07% deltaTime=0ms time=584ms< / pre > < / div >
< / div >
< ul class = "simple" >
< li > < p > 没有线程ID， < code class = "docutils literal notranslate" > < span class = "pre" > [Internal]< / span > < / code > 表示为JVM内部线程， < a class = "reference internal" href = "dashboard.html" > < span class = "doc" > dashboard< / span > < / a > 命令的介绍。< / p > < / li >
< li > < p > < code class = "docutils literal notranslate" > < span class = "pre" > cpuUsage< / span > < / code > 为采样间隔时间内线程的CPU使用率， < a class = "reference internal" href = "dashboard.html" > < span class = "doc" > dashboard< / span > < / a > 命令的数据一致。< / p > < / li >
< li > < p > < code class = "docutils literal notranslate" > < span class = "pre" > deltaTime< / span > < / code > 为采样间隔时间内线程的增量CPU时间， < / p > < / li >
< li > < p > < code class = "docutils literal notranslate" > < span class = "pre" > time< / span > < / code > 线程运行总CPU时间。< / p > < / li >
< / ul >
< p > 注意：线程栈为第二采样结束时获取，不能表明采样间隔时间内该线程都是在处理相同的任务。建议间隔时间不要太长，可能间隔时间越大越不准确。
可以根据具体情况尝试指定不同的间隔时间，观察输出结果。< / p >
< / div >
< div class = "section" id = "id4" >
< h3 > 当没有参数时，显示第一页线程的信息< a class = "headerlink" href = "#id4" title = "永久链接至标题" > ¶< / a > < / h3 >
< p > 默认按照CPU增量时间降序排列， < / p >
< div class = "highlight-shell notranslate" > < div class = "highlight hljs" > < pre class = "shell" > $ thread
Threads Total: 33, NEW: 0, RUNNABLE: 9, BLOCKED: 0, WAITING: 3, TIMED_WAITING: 4, TERMINATED: 0, Internal threads: 17
ID NAME GROUP PRIORITY STATE %CPU DELTA_TIME TIME INTERRUPT DAEMON
-1 C2 CompilerThread0 - -1 - 5.06 0.010 0:0.973 false true
-1 C1 CompilerThread0 - -1 - 0.95 0.001 0:0.603 false true
23 arthas-command-execute system 5 RUNNABLE 0.17 0.000 0:0.226 false true
-1 VM Periodic Task Thread - -1 - 0.05 0.000 0:0.094 false true
-1 Sweeper thread - -1 - 0.04 0.000 0:0.011 false true
-1 G1 Young RemSet Sampling - -1 - 0.02 0.000 0:0.025 false true
12 Attach Listener system 9 RUNNABLE 0.0 0.000 0:0.022 false true
11 Common-Cleaner InnocuousThrea 8 TIMED_WAI 0.0 0.000 0:0.000 false true
3 Finalizer system 8 WAITING 0.0 0.000 0:0.000 false true
2 Reference Handler system 10 RUNNABLE 0.0 0.000 0:0.000 false true
4 Signal Dispatcher system 9 RUNNABLE 0.0 0.000 0:0.000 false true
15 arthas-NettyHttpTelnetBootstra system 5 RUNNABLE 0.0 0.000 0:0.029 false true
22 arthas-NettyHttpTelnetBootstra system 5 RUNNABLE 0.0 0.000 0:0.196 false true
24 arthas-NettyHttpTelnetBootstra system 5 RUNNABLE 0.0 0.000 0:0.038 false true
16 arthas-NettyWebsocketTtyBootst system 5 RUNNABLE 0.0 0.000 0:0.001 false true
17 arthas-NettyWebsocketTtyBootst system 5 RUNNABLE 0.0 0.000 0:0.001 false true< / pre > < / div >
< / div >
< / div >
< div class = "section" id = "thread-all" >
< h3 > thread – < a class = "headerlink" href = "#thread-all" title = "永久链接至标题" > ¶< / a > < / h3 >
< p > 显示所有匹配线程信息， < / p >
< / div >
< div class = "section" id = "thread-id" >
< h3 > thread id, 显示指定线程的运行堆栈< 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" >
< 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< code class = "docutils literal notranslate" > < span class = "pre" > thread< / span > < span class = "pre" > -b< / span > < / code > ， < / 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 > < p > 注意， 目前只支持找出synchronized关键字阻塞住的线程， < code class = "docutils literal notranslate" > < span class = "pre" > java.util.concurrent.Lock< / span > < / code > ， < / p >
< / div > < / blockquote >
< / div >
< div class = "section" id = "thread-i" >
< 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 >
< ul class = "simple" >
< li > < p > < code class = "docutils literal notranslate" > < span class = "pre" > thread< / span > < span class = "pre" > -i< / span > < span class = "pre" > 1000< / span > < / code > : 统计最近1000ms内的线程CPU时间。< / p > < / li >
< li > < p > < code class = "docutils literal notranslate" > < span class = "pre" > thread< / span > < span class = "pre" > -n< / span > < span class = "pre" > 3< / span > < span class = "pre" > -i< / span > < span class = "pre" > 1000< / span > < / code > : 列出1000ms内最忙的3个线程栈< / p > < / li >
< / ul >
< 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
...< / pre > < / div >
< / div >
< / div >
< div class = "section" id = "thread-state" >
< h3 > thread – < a class = "headerlink" href = "#thread-state" title = "永久链接至标题" > ¶< / a > < / h3 >
< div class = "highlight-bash notranslate" > < div class = "highlight hljs" > < pre class = "bash" > [arthas@28114]$ thread --state WAITING
Threads Total: 16, NEW: 0, RUNNABLE: 9, BLOCKED: 0, WAITING: 3, TIMED_WAITING: 4, TERMINATED: 0
ID NAME GROUP PRIORITY STATE %CPU DELTA_TIME TIME INTERRUPTE DAEMON
3 Finalizer system 8 WAITING 0.0 0.000 0:0.000 false true
20 arthas-UserStat system 9 WAITING 0.0 0.000 0:0.001 false true
14 arthas-timer system 9 WAITING 0.0 0.000 0:0.000 false true< / pre > < / div >
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