$ dashboard
-ID NAME GROUP PRIORITY STATE %CPU TIME INTERRUPTED DAEMON
-889 RMI TCP Connection(15)-30.10.166. RMI Runtime 9 RUNNABLE 48 0:5 false true
-1077 Timer-for-arthas-dashboard-0 system 9 RUNNABLE 24 0:0 false true
-1074 as-selector-daemon system 9 RUNNABLE 12 0:0 false true
-284 JMX server connection timeout 284 RMI Runtime 9 TIMED_WAITI 8 0:3 false true
-16 Timer-1 main 5 TIMED_WAITI 5 0:9 false true
-47 Pandora pandora-qos-reporter Pool main 5 TIMED_WAITI 0 0:0 false true
-48 JmonitorClient-CheckThread Pool [ main 5 TIMED_WAITI 0 0:0 false true
-49 JmonitorClient-HeartBeat Pool [Th main 5 TIMED_WAITI 0 0:0 false true
-50 JmonitorClient-ReaderThread Pool main 5 TIMED_WAITI 0 0:0 false true
-957 RMI TCP Connection(16)-30.10.166. RMI Runtime 9 RUNNABLE 0 0:2 false true
-51 JmonitorClient-WriterThread Pool main 5 TIMED_WAITI 0 0:0 false true
-52 ContainerBackgroundProcessor[Stan main 5 TIMED_WAITI 0 0:0 false true
-53 http-bio-8080-Acceptor-0 main 5 RUNNABLE 0 0:2 false true
-54 http-bio-8080-AsyncTimeout main 5 TIMED_WAITI 0 0:0 false true
-11 GC Daemon system 2 TIMED_WAITI 0 0:0 false true
-Memory used total max usage GC
-heap 59M 223M 1820M 3.26% gc.ps_scavenge.count 118
-ps_eden_space 14M 114M 668M 2.11% gc.ps_scavenge.time(ms) 1890
-ps_survivor_space 6M 6M 6M 96.08% gc.ps_marksweep.count 5
-ps_old_gen 39M 103M 1365M 2.86% gc.ps_marksweep.time(ms) 1140
-nonheap 234M 240M 0M 97.46%
-code_cache 46M 47M 240M 19.49%
-metaspace 167M 172M 0M 97.36%
-Runtime Tomcat
-os.name Mac OS X connector http-bio-8080
-os.version 10.10.5 QPS 0.00
-java.version 1.8.0_60 RT(ms) 1.13
-java.home error/s 0.00
- received/s 0B
-systemload.average 3.44 sent/s 0B
-processors 4 threadpool http-bio-8080
-uptime 16020s busy 0
+ID NAME GROUP PRIORITY STATE %CPU DELTA_TIME TIME INTERRUPTE DAEMON
+-1 C2 CompilerThread0 - -1 - 1.55 0.077 0:8.684 false true
+53 Timer-for-arthas-dashboard-07b system 5 RUNNABLE 0.08 0.004 0:0.004 false true
+22 scheduling-1 main 5 TIMED_WAI 0.06 0.003 0:0.287 false false
+-1 C1 CompilerThread0 - -1 - 0.06 0.003 0:2.171 false true
+-1 VM Periodic Task Thread - -1 - 0.03 0.001 0:0.092 false true
+49 arthas-NettyHttpTelnetBootstra system 5 RUNNABLE 0.02 0.001 0:0.156 false true
+16 Catalina-utility-1 main 1 TIMED_WAI 0.0 0.000 0:0.029 false false
+-1 G1 Young RemSet Sampling - -1 - 0.0 0.000 0:0.019 false true
+17 Catalina-utility-2 main 1 WAITING 0.0 0.000 0:0.025 false false
+34 http-nio-8080-ClientPoller main 5 RUNNABLE 0.0 0.000 0:0.016 false true
+23 http-nio-8080-BlockPoller main 5 RUNNABLE 0.0 0.000 0:0.011 false true
+-1 VM Thread - -1 - 0.0 0.000 0:0.032 false true
+-1 Service Thread - -1 - 0.0 0.000 0:0.006 false true
+-1 GC Thread#5 - -1 - 0.0 0.000 0:0.043 false true
+Memory used total max usage GC
+heap 36M 70M 4096M 0.90% gc.g1_young_generation.count 12
+g1_eden_space 6M 18M -1 33.33% 86
+g1_old_gen 30M 50M 4096M 0.74% gc.g1_old_generation.count 0
+g1_survivor_space 491K 2048K -1 24.01% gc.g1_old_generation.time(ms) 0
+nonheap 66M 69M -1 96.56%
+codeheap_'non-nmethods' 1M 2M 5M 22.39%
+metaspace 46M 47M -1 98.01%
+Runtime
+os.name Mac OS X
+os.version 10.15.4
+java.version 15
+java.home /Library/Java/JavaVirtualMachines/jdk-15.jdk/Contents/Home
+systemload.average 10.68
+processors 8
+uptime 272s
ID: Java级别的线程ID，注意这个ID不能跟jstack中的nativeID一一对应
ID: Java级别的线程ID，注意这个ID不能跟jstack中的nativeID一一对应。
NAME: 线程名
GROUP: 线程组名
PRIORITY: 线程优先级, 1~10之间的数字，越大表示优先级越高
STATE: 线程的状态
CPU%: 线程消耗的cpu占比，采样100ms，将所有线程在这100ms内的cpu使用量求和，再算出每个线程的cpu使用占比。
TIME: 线程运行总时间，数据格式为分：秒
CPU%: 线程的cpu使用率。比如采样间隔1000ms，某个线程的增量cpu时间为100ms，则cpu使用率=100/1000=10%
DELTA_TIME: 上次采样之后线程运行增量CPU时间，数据格式为秒
TIME: 线程运行总CPU时间，数据格式为分:秒
INTERRUPTED: 线程当前的中断位状态
DAEMON: 是否是daemon线程
Java 8之后支持获取JVM内部线程CPU时间，这些线程只有名称和CPU时间，没有ID及状态等信息（显示ID为-1）。 +通过内部线程可以观测到JVM活动，如GC、JIT编译等占用CPU情况，方便了解JVM整体运行状况。
+当JVM 堆(heap)/元数据(metaspace)空间不足或OOM时，可以看到GC线程的CPU占用率明显高于其他的线程。
当执行trace/watch/tt/redefine等命令后，可以看到JIT线程活动变得更频繁。因为JVM热更新class字节码时清除了此class相关的JIT编译结果，需要重新编译。
JVM内部线程包括下面几种：
+JIT编译线程: 如 C1 CompilerThread0, C2 CompilerThread0
GC线程: 如GC Thread0, G1 Young RemSet Sampling
其它内部线程: 如VM Periodic Task Thread, VM Thread, Service Thread
$ dashboard
-ID NAME GROUP PRIORITY STATE %CPU TIME INTERRUPTED DAEMON
-889 RMI TCP Connection(15)-30.10.166. RMI Runtime 9 RUNNABLE 48 0:5 false true
-1077 Timer-for-arthas-dashboard-0 system 9 RUNNABLE 24 0:0 false true
-1074 as-selector-daemon system 9 RUNNABLE 12 0:0 false true
-284 JMX server connection timeout 284 RMI Runtime 9 TIMED_WAITI 8 0:3 false true
-16 Timer-1 main 5 TIMED_WAITI 5 0:9 false true
-47 Pandora pandora-qos-reporter Pool main 5 TIMED_WAITI 0 0:0 false true
-48 JmonitorClient-CheckThread Pool [ main 5 TIMED_WAITI 0 0:0 false true
-49 JmonitorClient-HeartBeat Pool [Th main 5 TIMED_WAITI 0 0:0 false true
-50 JmonitorClient-ReaderThread Pool main 5 TIMED_WAITI 0 0:0 false true
-957 RMI TCP Connection(16)-30.10.166. RMI Runtime 9 RUNNABLE 0 0:2 false true
-51 JmonitorClient-WriterThread Pool main 5 TIMED_WAITI 0 0:0 false true
-52 ContainerBackgroundProcessor[Stan main 5 TIMED_WAITI 0 0:0 false true
-53 http-bio-8080-Acceptor-0 main 5 RUNNABLE 0 0:2 false true
-54 http-bio-8080-AsyncTimeout main 5 TIMED_WAITI 0 0:0 false true
-11 GC Daemon system 2 TIMED_WAITI 0 0:0 false true
-Memory used total max usage GC
-heap 59M 223M 1820M 3.26% gc.ps_scavenge.count 118
-ps_eden_space 14M 114M 668M 2.11% gc.ps_scavenge.time(ms) 1890
-ps_survivor_space 6M 6M 6M 96.08% gc.ps_marksweep.count 5
-ps_old_gen 39M 103M 1365M 2.86% gc.ps_marksweep.time(ms) 1140
-nonheap 234M 240M 0M 97.46%
-code_cache 46M 47M 240M 19.49%
-metaspace 167M 172M 0M 97.36%
-Runtime Tomcat
-os.name Mac OS X connector http-bio-8080
-os.version 10.10.5 QPS 0.00
-java.version 1.8.0_60 RT(ms) 1.13
-java.home error/s 0.00
- received/s 0B
-systemload.average 3.44 sent/s 0B
-processors 4 threadpool http-bio-8080
-uptime 16020s busy 0
+ID NAME GROUP PRIORITY STATE %CPU DELTA_TIME TIME INTERRUPTE DAEMON
+-1 C2 CompilerThread0 - -1 - 1.55 0.077 0:8.684 false true
+53 Timer-for-arthas-dashboard-07b system 5 RUNNABLE 0.08 0.004 0:0.004 false true
+22 scheduling-1 main 5 TIMED_WAI 0.06 0.003 0:0.287 false false
+-1 C1 CompilerThread0 - -1 - 0.06 0.003 0:2.171 false true
+-1 VM Periodic Task Thread - -1 - 0.03 0.001 0:0.092 false true
+49 arthas-NettyHttpTelnetBootstra system 5 RUNNABLE 0.02 0.001 0:0.156 false true
+16 Catalina-utility-1 main 1 TIMED_WAI 0.0 0.000 0:0.029 false false
+-1 G1 Young RemSet Sampling - -1 - 0.0 0.000 0:0.019 false true
+17 Catalina-utility-2 main 1 WAITING 0.0 0.000 0:0.025 false false
+34 http-nio-8080-ClientPoller main 5 RUNNABLE 0.0 0.000 0:0.016 false true
+23 http-nio-8080-BlockPoller main 5 RUNNABLE 0.0 0.000 0:0.011 false true
+-1 VM Thread - -1 - 0.0 0.000 0:0.032 false true
+-1 Service Thread - -1 - 0.0 0.000 0:0.006 false true
+-1 GC Thread#5 - -1 - 0.0 0.000 0:0.043 false true
+Memory used total max usage GC
+heap 36M 70M 4096M 0.90% gc.g1_young_generation.count 12
+g1_eden_space 6M 18M -1 33.33% 86
+g1_old_gen 30M 50M 4096M 0.74% gc.g1_old_generation.count 0
+g1_survivor_space 491K 2048K -1 24.01% gc.g1_old_generation.time(ms) 0
+nonheap 66M 69M -1 96.56%
+codeheap_'non-nmethods' 1M 2M 5M 22.39%
+metaspace 46M 47M -1 98.01%
+Runtime
+os.name Mac OS X
+os.version 10.15.4
+java.version 15
+java.home /Library/Java/JavaVirtualMachines/jdk-15.jdk/Contents/Home
+systemload.average 10.68
+processors 8
+uptime 272s
GROUP: thread group name
PRIORITY: thread priority, ranged from 1 to 10. The greater number, the higher priority
STATE: thread state
CPU%: the ratio of CPU usage for the thread, sampled every 100ms
TIME: total running time in minute:second format
CPU%: the ratio of CPU usage for the thread. For example, the sampling interval is 1000ms, and the incremental cpu time +of a thread is 100ms, then the cpu usage rate=100/1000=10%
DELTA_TIME: incremental CPU time of thread running after the last sampling in second format
TIME: total CPU time of the thread in minute:second format
INTERRUPTED: the thread interruption state
DAEMON: daemon thread or not
After Java 8, it is supported to obtain the CPU time of JVM internal threads. These threads only have the name and CPU time, +without ID and status information (display ID is -1).
+JVM activities can be observed through internal threads, such as GC, JIT compilation, etc., to perceive the overall status of JVM.
+When the JVM heap/metaspace space is insufficient or OOM, it can be seen that the CPU usage of the GC threads is +significantly higher than other threads.
After executing commands such as trace/watch/tt/redefine, you can see that JIT threads activities become more frequent.
+Because the JIT compilation data related to this class is cleared when the JVM hot update the class bytecode, it needs to be recompiled.
JVM internal threads include the following:
+JIT compilation thread: such as C1 CompilerThread0, C2 CompilerThread0
GC thread: such as GC Thread0, G1 Young RemSet Sampling
Other internal threads: such asVM Periodic Task Thread, VM Thread, Service Thread
<value>]-+How the CPU ratios are calculated?
+
-CPU ratio for a given thread is the CPU time it takes divided by the total CPU time within a specified interval period. It is calculated in the following way: sample CPU times for all the thread by callingjava.lang.management.ThreadMXBean#getThreadCpuTimefirst, then sleep for a period (the default value is 100ms, which can be specified by-i), then sample CPU times again. By this, we can get the time cost for this period for each thread, then come up with the ratio.
-Note: this operation consumes CPU time too (getThreadCpuTimeis time-consuming), therefore it is possible to observe Arthas’s thread appears in the list. To avoid this, try to increase sample interval, for example: 5000 ms.
-If you’d like to check the CPU ratios from the very beginning of the Java process, show-busy-java-threads can come to help.+How the CPU ratios are calculated?¶
+The cpu ratios here is similar to the thread
+%CPUof the linux commandtop -H -p <pid>. During a sampling interval, +the ratio of the incremental cpu time of each thread in the current JVM to the sampling interval time.++Working principle description:
++
+- +
Do the first sampling, get the CPU time of all threads ( by calling
java.lang.management.ThreadMXBean#getThreadCpuTime()and +sun.management.HotspotThreadMBean.getInternalThreadCpuTimes())- +
Sleep and wait for an interval (the default is 200ms, the interval can be specified by
-i)- +
Do the second sampling, get the CPU time of all threads, compare the two sampling data, and calculate the incremental CPU time of each thread
- +
Thread CPU usage ratio=Thread increment CPU time/Sampling interval time* 100%++Note: this operation consumes CPU time too (
+getThreadCpuTimeis time-consuming), therefore it is possible to observe Arthas’s thread appears in the list. To avoid this, try to increase sample interval, for example: 5000 ms.+Another way to view the thread cpu usage of the Java process, show-busy-java-threads can come to help.
@@ -275,54 +296,66 @@ If you’d like to check the CPU ratios from the very beginning of the Java proc-+List the top n busiest threads with detailed stack trace¶
+"VM Periodic Task Thread" [Internal] cpuUsage=0.07% deltaTime=0ms time=584ms$ 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) +"C1 CompilerThread0" [Internal] cpuUsage=1.63% deltaTime=3ms time=1170ms - Number of locked synchronizers = 1 - - java.util.concurrent.ThreadPoolExecutor$Worker@6cd0b6f8 +"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) -"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)+
+- +
Without thread ID, including
[Internal]means JVM internal thread, refer to the introduction of dashboard command.- +
cpuUsageis the CPU usage of the thread during the sampling interval, consistent with the data of the dashboard command.- +
deltaTimeis the incremental CPU time of the thread during the sampling interval. If it is less than 1ms, it will be rounded and displayed as 0ms.- +
timeThe total CPU time of thread.Note: The thread stack is acquired at the end of the second sampling, which does not indicate that the thread is +processing the same task during the sampling interval. It is recommended that the interval time should not be too long. +The larger the interval time, the more inaccurate.
+You can try to specify different intervals according to the specific situation and observe the output results.
-+List all threads’ info when no options provided¶
++List first page threads’ info when no options provided¶
+By default, they are arranged in descending order of CPU increment time, and only the first page of data is displayed.
+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$ 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+thread –all, show all matching threads¶
+Display all matching threads. Sometimes it is necessary to obtain all the thread data of the JVM for analysis.
+thread id, show the running stack for the target thread¶
$ thread 1 @@ -382,6 +415,10 @@ ID NAME GROUP PRIORITY STA+thread -i, specify the sampling interval¶
++
- +
thread -i 1000: Count the thread cpu time of the last 1000ms.- +
thread -n 3 -i 1000: List the 3 busiest thread stacks in 1000msdiff --git a/en/trace.html b/en/trace.html index d22bb9b13..a60f58c16 100644 --- a/en/trace.html +++ b/en/trace.html @@ -8,7 +8,7 @@ -$ thread -n 3 -i 1000 "as-command-execute-daemon" Id=4759 cpuUsage=23% RUNNABLE at sun.management.ThreadImpl.dumpThreads0(Native Method) @@ -405,13 +442,11 @@ ID NAME GROUP PRIORITY STAthread –state , view the special state theads¶
+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[arthas@28114]$ thread --state WAITING -Threads Total: 15, NEW: 0, RUNNABLE: 7, BLOCKED: 0, WAITING: 5, TIMED_WAITING: 3, TERMINATED: 0 -ID NAME GROUP PRIORITY STATE %CPU TIME INTERRU DAEMON -198 AsyncAppender-Worker-arth system 9 WAITING 0 0:0 false true -3 Finalizer system 8 WAITING 0 0:0 false true -14 RMI Scheduler(0) system 9 WAITING 0 0:0 false true -2 Reference Handler system 10 WAITING 0 0:0 false true -204 pool-8-thread-1 system 5 WAITING 0 0:0 false falsetrace — Arthas 3.4.1 documentation +trace — Arthas 3.4.2 documentation @@ -73,7 +73,7 @@- 3.4.1 + 3.4.2diff --git a/en/tt.html b/en/tt.html index 5362d3bf0..3edf383a5 100644 --- a/en/tt.html +++ b/en/tt.html @@ -8,7 +8,7 @@ -tt — Arthas 3.4.1 documentation +tt — Arthas 3.4.2 documentation @@ -73,7 +73,7 @@- 3.4.1 + 3.4.2diff --git a/en/vmoption.html b/en/vmoption.html index 8b04a4aea..a32b1bc88 100644 --- a/en/vmoption.html +++ b/en/vmoption.html @@ -8,7 +8,7 @@ -vmoption — Arthas 3.4.1 documentation +vmoption — Arthas 3.4.2 documentation @@ -73,7 +73,7 @@- 3.4.1 + 3.4.2diff --git a/en/watch.html b/en/watch.html index bb9591dc1..087ca1840 100644 --- a/en/watch.html +++ b/en/watch.html @@ -8,7 +8,7 @@ -watch — Arthas 3.4.1 documentation +watch — Arthas 3.4.2 documentation @@ -73,7 +73,7 @@- 3.4.1 + 3.4.2diff --git a/en/web-console.html b/en/web-console.html index 828f7cd37..9fb0b67f1 100644 --- a/en/web-console.html +++ b/en/web-console.html @@ -8,7 +8,7 @@ -Web Console — Arthas 3.4.1 documentation +Web Console — Arthas 3.4.2 documentation @@ -73,7 +73,7 @@- 3.4.1 + 3.4.2diff --git a/genindex.html b/genindex.html index 727b2b135..673b34133 100644 --- a/genindex.html +++ b/genindex.html @@ -9,7 +9,7 @@ -索引 — Arthas 3.4.1 文档 +索引 — Arthas 3.4.2 文档 @@ -73,7 +73,7 @@- 3.4.1 + 3.4.2diff --git a/getstatic.html b/getstatic.html index 2e2e3383a..1e8c81e10 100644 --- a/getstatic.html +++ b/getstatic.html @@ -8,7 +8,7 @@ -getstatic — Arthas 3.4.1 文档 +getstatic — Arthas 3.4.2 文档 @@ -74,7 +74,7 @@- 3.4.1 + 3.4.2diff --git a/grep.html b/grep.html index 2520cbb1e..c627aad12 100644 --- a/grep.html +++ b/grep.html @@ -8,7 +8,7 @@ -grep — Arthas 3.4.1 文档 +grep — Arthas 3.4.2 文档 @@ -74,7 +74,7 @@- 3.4.1 + 3.4.2diff --git a/groovy.html b/groovy.html index 1d871399e..6a1404fa9 100644 --- a/groovy.html +++ b/groovy.html @@ -8,7 +8,7 @@ -groovy — Arthas 3.4.1 文档 +groovy — Arthas 3.4.2 文档 @@ -72,7 +72,7 @@- 3.4.1 + 3.4.2diff --git a/heapdump.html b/heapdump.html index b775c7856..5a68ff2c0 100644 --- a/heapdump.html +++ b/heapdump.html @@ -8,7 +8,7 @@ -heapdump — Arthas 3.4.1 文档 +heapdump — Arthas 3.4.2 文档 @@ -74,7 +74,7 @@- 3.4.1 + 3.4.2diff --git 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\ No newline at end of file diff --git a/sm.html b/sm.html index fccafdc72..24746b03d 100644 --- a/sm.html +++ b/sm.html @@ -8,7 +8,7 @@ -sm — Arthas 3.4.1 文档 +sm — Arthas 3.4.2 文档 @@ -74,7 +74,7 @@- 3.4.1 + 3.4.2diff --git a/spring-boot-starter.html b/spring-boot-starter.html index b23de13df..59d885b0b 100644 --- a/spring-boot-starter.html +++ b/spring-boot-starter.html @@ -8,7 +8,7 @@ -Arthas Spring Boot Starter — Arthas 3.4.1 文档 +Arthas Spring Boot Starter — Arthas 3.4.2 文档 @@ -74,7 +74,7 @@- 3.4.1 + 3.4.2diff --git a/stack.html b/stack.html index 50863db2c..aa211d3f4 100644 --- a/stack.html +++ b/stack.html @@ -8,7 +8,7 @@ -stack — Arthas 3.4.1 文档 +stack — Arthas 3.4.2 文档 @@ -74,7 +74,7 @@- 3.4.1 + 3.4.2diff --git a/start-arthas.html b/start-arthas.html index 373357435..6204515d8 100644 --- a/start-arthas.html +++ b/start-arthas.html @@ -8,7 +8,7 @@ -启动 Arthas — Arthas 3.4.1 文档 +启动 Arthas — Arthas 3.4.2 文档 @@ -72,7 +72,7 @@- 3.4.1 + 3.4.2diff --git a/sysenv.html b/sysenv.html index 8243540eb..6ede31144 100644 --- a/sysenv.html +++ b/sysenv.html @@ -8,7 +8,7 @@ -sysenv — Arthas 3.4.1 文档 +sysenv — Arthas 3.4.2 文档 @@ -74,7 +74,7 @@- 3.4.1 + 3.4.2diff --git a/sysprop.html b/sysprop.html index f47dfe6ec..ee488ed05 100644 --- a/sysprop.html +++ b/sysprop.html @@ -8,7 +8,7 @@ -sysprop — Arthas 3.4.1 文档 +sysprop — Arthas 3.4.2 文档 @@ -74,7 +74,7 @@- 3.4.1 + 3.4.2diff --git a/tee.html b/tee.html index b8e982bb5..c75f3a21d 100644 --- a/tee.html +++ b/tee.html @@ -8,7 +8,7 @@ -tee — Arthas 3.4.1 文档 +tee — Arthas 3.4.2 文档 @@ -74,7 +74,7 @@- 3.4.1 + 3.4.2diff --git a/thread.html b/thread.html index d54898ed7..fccec93c5 100644 --- a/thread.html +++ b/thread.html @@ -8,7 +8,7 @@ -thread — Arthas 3.4.1 文档 +thread — Arthas 3.4.2 文档 @@ -74,7 +74,7 @@- 3.4.1 + 3.4.2@@ -111,10 +111,15 @@- dashboard
- thread
- 参数说明
-- 使用参考
+
- cpu使用率是如何统计出来的？
++
+- 工作原理说明：
+- 使用参考
- 支持一键展示当前最忙的前N个线程并打印堆栈：
-- 当没有参数时，显示所有线程的信息。
-- thread id， 显示指定线程的运行堆栈
+- 当没有参数时，显示第一页线程的信息
+- thread –all, 显示所有匹配的线程
+- thread id, 显示指定线程的运行堆栈
- thread -b, 找出当前阻塞其他线程的线程
- thread -i, 指定采样时间间隔
- thread –state ，查看指定状态的线程
@@ -263,78 +268,98 @@+ [i -<value>]指定cpu占比统计的采样间隔，单位为毫秒 +指定cpu使用率统计的采样间隔，单位为毫秒，默认值为200 ++ -[--all] +显示所有匹配的线程 --cpu占比是如何统计出来的？
--+这里的cpu统计的是，一段采样间隔内，当前JVM里各个线程所占用的cpu时间占总cpu时间的百分比。其计算方法为： -首先进行一次采样，获得所有线程的cpu的使用时间(调用的是
-java.lang.management.ThreadMXBean#getThreadCpuTime这个接口)，然后睡眠一段时间，默认100ms，可以通过-i参数指定，然后再采样一次，最后得出这段时间内各个线程消耗的cpu时间情况，最后算出百分比。+cpu使用率是如何统计出来的？¶
+这里的cpu使用率与linux 命令
+top -H -p <pid>的线程%CPU类似，一段采样间隔时间内，当前JVM里各个线程的增量cpu时间与采样间隔时间的比例。+工作原理说明：¶
++
- +
首先第一次采样，获取所有线程的CPU时间(调用的是
java.lang.management.ThreadMXBean#getThreadCpuTime()及sun.management.HotspotThreadMBean.getInternalThreadCpuTimes()接口)- +
然后睡眠等待一个间隔时间（默认为200ms，可以通过
-i指定间隔时间）- +
再次第二次采样，获取所有线程的CPU时间，对比两次采样数据，计算出每个线程的增量CPU时间
- +
线程CPU使用率 = 线程增量CPU时间 / 采样间隔时间 * 100%
注意： 这个统计也会产生一定的开销（JDK这个接口本身开销比较大），因此会看到as的线程占用一定的百分比，为了降低统计自身的开销带来的影响，可以把采样间隔拉长一些，比如5000毫秒。
--如果想看从Java进程启动开始到现在的cpu占比情况：可以使用show-busy-java-threads这个脚本
+另外一种查看Java进程的线程cpu使用率方法：可以使用show-busy-java-threads这个脚本
-使用参考¶
--支持一键展示当前最忙的前N个线程并打印堆栈：¶
--$ 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)-当没有参数时，显示所有线程的信息。¶
-+$ 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使用参考¶
+++支持一键展示当前最忙的前N个线程并打印堆栈：¶
++$ 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$Worker.run(ThreadPoolExecutor.java:628) + at java.base@11.0.7/java.lang.Thread.run(Thread.java:834) + +"VM Periodic Task Thread" [Internal] cpuUsage=0.07% deltaTime=0ms time=584ms+
+- +
没有线程ID，包含
[Internal]表示为JVM内部线程，参考dashboard命令的介绍。- +
cpuUsage为采样间隔时间内线程的CPU使用率，与dashboard命令的数据一致。- +
deltaTime为采样间隔时间内线程的增量CPU时间，小于1ms时被取整显示为0ms。- +
time线程运行总CPU时间。注意：线程栈为第二采样结束时获取，不能表明采样间隔时间内该线程都是在处理相同的任务。建议间隔时间不要太长，可能间隔时间越大越不准确。 +可以根据具体情况尝试指定不同的间隔时间，观察输出结果。
+++当没有参数时，显示第一页线程的信息¶
+默认按照CPU增量时间降序排列，只显示第一页数据。
+++$ 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+thread –all, 显示所有匹配的线程¶
+显示所有匹配线程信息，有时需要获取全部JVM的线程数据进行分析。
-thread id， 显示指定线程的运行堆栈¶
+thread id, 显示指定线程的运行堆栈¶
$ thread 1 "main" Id=1 WAITING on java.util.concurrent.CountDownLatch$Sync@29fafb28 at sun.misc.Unsafe.park(Native Method) @@ -392,6 +417,10 @@ ID NAME GROUP PRIORITY STAthread -i, 指定采样时间间隔¶
++
- +
thread -i 1000: 统计最近1000ms内的线程CPU时间。- +
thread -n 3 -i 1000: 列出1000ms内最忙的3个线程栈diff --git a/trace.html b/trace.html index a888c3fbd..ea104afd2 100644 --- a/trace.html +++ b/trace.html @@ -8,7 +8,7 @@ -$ thread -n 3 -i 1000 "as-command-execute-daemon" Id=4759 cpuUsage=23% RUNNABLE at sun.management.ThreadImpl.dumpThreads0(Native Method) @@ -415,13 +444,11 @@ ID NAME GROUP PRIORITY STAthread –state ，查看指定状态的线程¶
+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[arthas@28114]$ thread --state WAITING -Threads Total: 15, NEW: 0, RUNNABLE: 7, BLOCKED: 0, WAITING: 5, TIMED_WAITING: 3, TERMINATED: 0 -ID NAME GROUP PRIORITY STATE %CPU TIME INTERRU DAEMON -198 AsyncAppender-Worker-arth system 9 WAITING 0 0:0 false true -3 Finalizer system 8 WAITING 0 0:0 false true -14 RMI Scheduler(0) system 9 WAITING 0 0:0 false true -2 Reference Handler system 10 WAITING 0 0:0 false true -204 pool-8-thread-1 system 5 WAITING 0 0:0 false falsetrace — Arthas 3.4.1 文档 +trace — Arthas 3.4.2 文档 @@ -74,7 +74,7 @@- 3.4.1 + 3.4.2diff --git a/tt.html b/tt.html index 48f29a03f..b9b8e1abc 100644 --- a/tt.html +++ b/tt.html @@ -8,7 +8,7 @@ -tt — Arthas 3.4.1 文档 +tt — Arthas 3.4.2 文档 @@ -74,7 +74,7 @@- 3.4.1 + 3.4.2diff --git a/vmoption.html b/vmoption.html index e92600920..37239992e 100644 --- a/vmoption.html +++ b/vmoption.html @@ -8,7 +8,7 @@ -vmoption — Arthas 3.4.1 文档 +vmoption — Arthas 3.4.2 文档 @@ -74,7 +74,7 @@- 3.4.1 + 3.4.2diff --git a/watch.html b/watch.html index 4fc814949..2622404fd 100644 --- a/watch.html +++ b/watch.html @@ -8,7 +8,7 @@ -watch — Arthas 3.4.1 文档 +watch — Arthas 3.4.2 文档 @@ -74,7 +74,7 @@- 3.4.1 + 3.4.2diff --git a/web-console.html b/web-console.html index bacc75f73..685c6f669 100644 --- a/web-console.html +++ b/web-console.html @@ -8,7 +8,7 @@ -Web Console — Arthas 3.4.1 文档 +Web Console — Arthas 3.4.2 文档 @@ -74,7 +74,7 @@- 3.4.1 + 3.4.2