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< h1 > dashboard< a class = "headerlink" href = "#dashboard" title = "永久链接至标题" > ¶< / a > < / h1 >
< p > < a class = "reference external" href = "https://arthas.aliyun.com/doc/arthas-tutorials.html?language=cn&id=command-dashboard" > < code class = "docutils literal notranslate" > < span class = "pre" > dashboard< / span > < / code > 在线教程< / a > < / p >
< blockquote >
< div > < p > 当前系统的实时数据面板，按 ctrl+c 退出。< / p >
< / div > < / blockquote >
< p > 当运行在Ali-tomcat时， ， < / p >
< div class = "section" id = "id1" >
< h2 > 参数说明< a class = "headerlink" href = "#id1" title = "永久链接至标题" > ¶< / a > < / h2 >
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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" > [i:]< / td >
< td align = "left" > 刷新实时数据的时间间隔 (ms)， < / td >
< / tr >
< tr >
< td align = "right" > [n:]< / td >
< td align = "left" > 刷新实时数据的次数< / td >
< / tr >
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< div class = "section" id = "id2" >
< h2 > 使用参考< a class = "headerlink" href = "#id2" title = "永久链接至标题" > ¶< / a > < / h2 >
< div class = "highlight-default notranslate" > < pre class = "literal-block" > $ dashboard
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< / pre >
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< h2 > 数据说明< a class = "headerlink" href = "#id3" title = "永久链接至标题" > ¶< / a > < / h2 >
< ul class = "simple" >
< li > < p > ID: Java级别的线程ID， < / p > < / li >
< li > < p > NAME: 线程名< / p > < / li >
< li > < p > GROUP: 线程组名< / p > < / li >
< li > < p > PRIORITY: 线程优先级, 1~10之间的数字， < / p > < / li >
< li > < p > STATE: 线程的状态< / p > < / li >
< li > < p > CPU%: 线程的cpu使用率。比如采样间隔1000ms， ， < / p > < / li >
< li > < p > DELTA_TIME: 上次采样之后线程运行增量CPU时间， < code class = "docutils literal notranslate" > < span class = "pre" > 秒< / span > < / code > < / p > < / li >
< li > < p > TIME: 线程运行总CPU时间， < code class = "docutils literal notranslate" > < span class = "pre" > 分:秒< / span > < / code > < / p > < / li >
< li > < p > INTERRUPTED: 线程当前的中断位状态< / p > < / li >
< li > < p > DAEMON: 是否是daemon线程< / p > < / li >
< / ul >
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< h3 > JVM内部线程< a class = "headerlink" href = "#jvm" title = "永久链接至标题" > ¶< / a > < / h3 >
< p > Java 8之后支持获取JVM内部线程CPU时间， ， （ ）
通过内部线程可以观测到JVM活动， ， < / p >
< ul class = "simple" >
< li > < p > 当JVM 堆(heap)/元数据(metaspace)空间不足或OOM时， < / p > < / li >
< li > < p > 当执行< code class = "docutils literal notranslate" > < span class = "pre" > trace/watch/tt/redefine< / span > < / code > 等命令后， ， < / p > < / li >
< / ul >
< p > JVM内部线程包括下面几种： < / p >
< ul class = "simple" >
< li > < p > JIT编译线程: 如 < code class = "docutils literal notranslate" > < span class = "pre" > C1< / span > < span class = "pre" > CompilerThread0< / span > < / code > , < code class = "docutils literal notranslate" > < span class = "pre" > C2< / span > < span class = "pre" > CompilerThread0< / span > < / code > < / p > < / li >
< li > < p > GC线程: 如< code class = "docutils literal notranslate" > < span class = "pre" > GC< / span > < span class = "pre" > Thread0< / span > < / code > , < code class = "docutils literal notranslate" > < span class = "pre" > G1< / span > < span class = "pre" > Young< / span > < span class = "pre" > RemSet< / span > < span class = "pre" > Sampling< / span > < / code > < / p > < / li >
< li > < p > 其它内部线程: 如< code class = "docutils literal notranslate" > < span class = "pre" > VM< / span > < span class = "pre" > Periodic< / span > < span class = "pre" > Task< / span > < span class = "pre" > Thread< / span > < / code > , < code class = "docutils literal notranslate" > < span class = "pre" > VM< / span > < span class = "pre" > Thread< / span > < / code > , < code class = "docutils literal notranslate" > < span class = "pre" > Service< / span > < span class = "pre" > Thread< / span > < / code > < / p > < / li >
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