import{_ as r,a as d}from"./arthas-output-svg.30f64f53.js";import{_ as t,o as l,c as o,a as e,b as n,e as a,d as i,r as c}from"./app.977e81c1.js";const p={},h=e("h1",{id:"profiler",tabindex:"-1"},[e("a",{class:"header-anchor",href:"#profiler","aria-hidden":"true"},"#"),a(" profiler")],-1),u={href:"https://arthas.aliyun.com/doc/arthas-tutorials.html?language=cn&id=command-profiler",target:"_blank",rel:"noopener noreferrer"},v=e("code",null,"profiler",-1),m=a("\u5728\u7EBF\u6559\u7A0B"),b={class:"custom-container tip"},f=e("p",{class:"custom-container-title"},"\u63D0\u793A",-1),g=a("\u4F7F\u7528"),_={href:"https://github.com/jvm-profiling-tools/async-profiler",target:"_blank",rel:"noopener noreferrer"},x=a("async-profiler"),k=a("\u751F\u6210\u706B\u7130\u56FE"),y=e("p",null,[e("code",null,"profiler"),a(" \u547D\u4EE4\u652F\u6301\u751F\u6210\u5E94\u7528\u70ED\u70B9\u7684\u706B\u7130\u56FE\u3002\u672C\u8D28\u4E0A\u662F\u901A\u8FC7\u4E0D\u65AD\u7684\u91C7\u6837\uFF0C\u7136\u540E\u628A\u6536\u96C6\u5230\u7684\u91C7\u6837\u7ED3\u679C\u751F\u6210\u706B\u7130\u56FE\u3002")],-1),j=e("p",null,[e("code",null,"profiler"),a(" \u547D\u4EE4\u57FA\u672C\u8FD0\u884C\u7ED3\u6784\u662F "),e("code",null,"profiler action [actionArg]")],-1),J=e("code",null,"profiler",-1),S=a(" \u547D\u4EE4\u7684\u683C\u5F0F\u57FA\u672C\u4E0E\u4E0A\u6E38\u9879\u76EE "),F={href:"https://github.com/async-profiler/async-profiler",target:"_blank",rel:"noopener noreferrer"},M=a("async-profiler"),R=a(" \u4FDD\u6301\u4E00\u81F4\uFF0C\u8BE6\u7EC6\u7684\u4F7F\u7528\u65B9\u5F0F\u53EF\u53C2\u8003\u4E0A\u6E38\u9879\u76EE\u7684 README\u3001Github Disscussions \u4EE5\u53CA\u5176\u4ED6\u6587\u6863\u8D44\u6599\u3002"),B=i(`

\u53C2\u6570\u8BF4\u660E

\u53C2\u6570\u540D\u79F0	\u53C2\u6570\u8BF4\u660E
action	\u8981\u6267\u884C\u7684\u64CD\u4F5C
actionArg	\u5C5E\u6027\u540D\u6A21\u5F0F
[i:]	\u91C7\u6837\u95F4\u9694\uFF08\u5355\u4F4D\uFF1Ans\uFF09\uFF08\u9ED8\u8BA4\u503C\uFF1A10'000'000\uFF0C\u5373 10 ms\uFF09
[f:]	\u5C06\u8F93\u51FA\u8F6C\u50A8\u5230\u6307\u5B9A\u8DEF\u5F84
[d:]	\u8FD0\u884C\u8BC4\u6D4B\u6307\u5B9A\u79D2
[e:]	\u8981\u8DDF\u8E2A\u54EA\u4E2A\u4E8B\u4EF6\uFF08cpu, alloc, lock, cache-misses \u7B49\uFF09\uFF0C\u9ED8\u8BA4\u662F cpu

\u542F\u52A8 profiler

$ profiler start
Started [cpu] profiling

\u63D0\u793A

\u9ED8\u8BA4\u60C5\u51B5\u4E0B\uFF0C\u751F\u6210\u7684\u662F cpu \u7684\u706B\u7130\u56FE\uFF0C\u5373 event \u4E3Acpu\u3002\u53EF\u4EE5\u7528--event\u53C2\u6570\u6307\u5B9A\u5176\u4ED6\u6027\u80FD\u5206\u6790\u6A21\u5F0F\uFF0C\u89C1\u4E0B\u6587\u3002

\u83B7\u53D6\u5DF2\u91C7\u96C6\u7684 sample \u7684\u6570\u91CF

$ profiler getSamples
23

\u67E5\u770B profiling \u72B6\u6001

$ profiler status
[cpu] profiling is running for 4 seconds

\u53EF\u4EE5\u67E5\u770B\u5F53\u524D profiler \u5728\u91C7\u6837\u54EA\u79CDevent\u548C\u91C7\u6837\u65F6\u95F4\u3002

\u67E5\u770B profiler \u81EA\u8EAB\u7684\u5185\u5B58\u5360\u7528

$ profiler meminfo
Call trace storage:   10244 KB
      Dictionaries:      72 KB
        Code cache:   12890 KB
------------------------------
             Total:   23206 KB

\u505C\u6B62 profiler

\u751F\u6210\u706B\u7130\u56FE\u683C\u5F0F\u7ED3\u679C

`,14),C=a("\u9ED8\u8BA4\u60C5\u51B5\u4E0B\uFF0C\u7ED3\u679C\u662F "),w={href:"https://github.com/BrendanGregg/FlameGraph",target:"_blank",rel:"noopener noreferrer"},G=a("Flame Graph"),$=a(" \u683C\u5F0F\u7684 "),D=e("code",null,"html",-1),E=a(" \u6587\u4EF6\uFF0C\u4E5F\u53EF\u4EE5\u7528 "),L=e("code",null,"-o",-1),A=a(" \u6216 "),N=e("code",null,"--format",-1),V=a(" \u53C2\u6570\u6307\u5B9A\u5176\u4ED6\u5185\u5BB9\u683C\u5F0F\uFF0C\u5305\u62EC flat\u3001traces\u3001collapsed\u3001flamegraph\u3001tree\u3001jfr\u3002"),O=i(`

$ profiler stop --format flamegraph
profiler output file: /tmp/test/arthas-output/20211207-111550.html
OK

\u5728--file\u53C2\u6570\u6307\u5B9A\u7684\u6587\u4EF6\u540D\u540E\u7F00\u4E3A html \u6216 jfr \u65F6\uFF0C\u6587\u4EF6\u683C\u5F0F\u53EF\u4EE5\u88AB\u63A8\u65AD\u51FA\u6765\u3002\u6BD4\u5982--file /tmp/result.html \u5C06\u81EA\u52A8\u751F\u6210\u706B\u7130\u56FE\u3002

\u901A\u8FC7\u6D4F\u89C8\u5668\u67E5\u770B arthas-output \u4E0B\u9762\u7684 profiler \u7ED3\u679C

`,3),z=a("\u9ED8\u8BA4\u60C5\u51B5\u4E0B\uFF0Carthas \u4F7F\u7528 3658 \u7AEF\u53E3\uFF0C\u5219\u53EF\u4EE5\u6253\u5F00\uFF1A "),I={href:"http://localhost:3658/arthas-output/",target:"_blank",rel:"noopener noreferrer"},T=a("http://localhost:3658/arthas-output/"),K=a(" \u67E5\u770B\u5230"),q=e("code",null,"arthas-output",-1),H=a("\u76EE\u5F55\u4E0B\u9762\u7684 profiler \u7ED3\u679C\uFF1A"),P=i('

\u70B9\u51FB\u53EF\u4EE5\u67E5\u770B\u5177\u4F53\u7684\u7ED3\u679C\uFF1A

\u63D0\u793A

\u5982\u679C\u662F chrome \u6D4F\u89C8\u5668\uFF0C\u53EF\u80FD\u9700\u8981\u591A\u6B21\u5237\u65B0\u3002

profiler \u652F\u6301\u7684 events

\u5728\u4E0D\u540C\u7684\u5E73\u53F0\uFF0C\u4E0D\u540C\u7684 OS \u4E0B\u9762\uFF0C\u652F\u6301\u7684 events \u5404\u6709\u4E0D\u540C\u3002\u6BD4\u5982\u5728 macos \u4E0B\u9762\uFF1A

$ profiler list
Basic events:
  cpu
  alloc
  lock
  wall
  itimer

\u5728 linux \u4E0B\u9762

$ profiler list
Basic events:
  cpu
  alloc
  lock
  wall
  itimer
Java method calls:
  ClassName.methodName
Perf events:
  page-faults
  context-switches
  cycles
  instructions
  cache-references
  cache-misses
  branch-instructions
  branch-misses
  bus-cycles
  L1-dcache-load-misses
  LLC-load-misses
  dTLB-load-misses
  rNNN
  pmu/event-descriptor/
  mem:breakpoint
  trace:tracepoint
  kprobe:func
  uprobe:path

`,9),U=a("\u5982\u679C\u9047\u5230 OS \u672C\u8EAB\u7684\u6743\u9650/\u914D\u7F6E\u95EE\u9898\uFF0C\u7136\u540E\u7F3A\u5C11\u90E8\u5206 event\uFF0C\u53EF\u4EE5\u53C2\u8003 "),W={href:"https://github.com/jvm-profiling-tools/async-profiler",target:"_blank",rel:"noopener noreferrer"},X=a("async-profiler \u7684\u6587\u6863"),Q=a("\u3002"),Y=i(`

\u53EF\u4EE5\u4F7F\u7528 check action \u6D4B\u8BD5\u67D0\u4E2A event \u662F\u5426\u53EF\u7528\uFF0C\u6B64 action \u7684\u53C2\u6570\u683C\u5F0F\u4E0E start \u4E00\u81F4\u3002

\u53EF\u4EE5\u7528--event\u53C2\u6570\u6307\u5B9A\u8981\u91C7\u6837\u7684\u4E8B\u4EF6\uFF0C\u6BD4\u5982 alloc \u8868\u793A\u5206\u6790\u5185\u5B58\u5206\u914D\u60C5\u51B5\uFF1A

$ profiler start --event alloc

\u6062\u590D\u91C7\u6837

$ profiler resume
Started [cpu] profiling

start\u548Cresume\u7684\u533A\u522B\u662F\uFF1Astart\u4F1A\u6E05\u9664\u5DF2\u6709\u7684\u5206\u6790\u7ED3\u679C\u91CD\u65B0\u5F00\u59CB\uFF0Cresume\u5219\u4F1A\u4FDD\u7559\u5DF2\u6709\u7684\u7ED3\u679C\uFF0C\u5C06\u65B0\u7684\u5206\u6790\u7ED3\u679C\u9644\u52A0\u5230\u5DF2\u6709\u7ED3\u679C\u4E2D\u3002

\u901A\u8FC7\u6267\u884Cprofiler getSamples\u53EF\u4EE5\u67E5\u770B samples \u7684\u6570\u91CF\u6765\u9A8C\u8BC1\u3002

Dump \u5206\u6790\u7ED3\u679C

$ profiler dump
OK

dump action \u5C06\u6027\u80FD\u5206\u6790\u7684\u7ED3\u679C\u4FDD\u5B58\u5230\u9ED8\u8BA4\u6587\u4EF6\u6216\u6307\u5B9A\u7684\u6587\u4EF6\u4E2D\uFF0C\u4F46 profiling \u8FC7\u7A0B\u4E0D\u4F1A\u505C\u6B62\u3002\u4F8B\u5982\uFF0C\u5982\u679C\u4F7F\u7528 start action \u542F\u52A8 profiling\uFF0C5 \u79D2\u540E\u6267\u884C dump action\uFF0C2 \u79D2\u540E\u518D\u6B21\u6267\u884C dump action\uFF0C\u5C06\u4F1A\u5F97\u5230 2 \u4E2A\u7ED3\u679C\u6587\u4EF6\uFF0C\u7B2C\u4E00\u4E2A\u6587\u4EF6\u5305\u62EC 0~5 \u79D2\u7684\u5206\u6790\u7ED3\u679C\uFF0C\u7B2C\u4E8C\u4E2A\u6587\u4EF6\u5305\u62EC 0~7 \u79D2\u7684\u5206\u6790\u7ED3\u679C\u3002

\u4F7F\u7528`execute`\u6765\u6267\u884C\u590D\u6742\u7684\u547D\u4EE4

\u6BD4\u5982\u5F00\u59CB\u91C7\u6837\uFF1A

profiler execute 'start,framebuf=5000000'

\u505C\u6B62\u91C7\u6837\uFF0C\u5E76\u4FDD\u5B58\u5230\u6307\u5B9A\u6587\u4EF6\u91CC\uFF1A

profiler execute 'stop,file=/tmp/result.html'

`,15),Z=a("\u5177\u4F53\u7684\u683C\u5F0F\u53C2\u8003\uFF1A "),ee={href:"https://github.com/async-profiler/async-profiler/blob/v2.9/src/arguments.cpp#L52",target:"_blank",rel:"noopener noreferrer"},ae=a("arguments.cpp"),se=i(`

\u67E5\u770B\u6240\u6709\u652F\u6301\u7684 action

$ profiler actions
Supported Actions: [resume, dumpCollapsed, getSamples, start, list, version, execute, meminfo, stop, load, dumpFlat, dump, actions, dumpTraces, status, check]

\u67E5\u770B\u7248\u672C

$ profiler version
Async-profiler 2.9 built on May  8 2023
Copyright 2016-2021 Andrei Pangin

\u914D\u7F6E Java \u6808\u6DF1\u5EA6

\u53EF\u4EE5\u4F7F\u7528 -j \u6216 --jstackdepth \u9009\u9879\u6307\u5B9A\u6700\u5927 Java \u6808\u6DF1\u5EA6\u3002\u5982\u679C\u6307\u5B9A\u503C\u5927\u4E8E\u9ED8\u8BA4\u503C 2048\uFF0C\u8BE5\u9009\u9879\u4F1A\u88AB\u5FFD\u7565\u3002\u5F53\u4F60\u4E0D\u5E0C\u671B\u770B\u5230\u7279\u522B\u6DF1\u7684\u6808\u8F68\u8FF9\u7684\u65F6\u5019\uFF0C\u8FD9\u4E2A\u9009\u9879\u4F1A\u5F88\u6709\u7528\uFF0C\u4EE5\u4E0B\u662F\u4E00\u4E2A\u4F7F\u7528\u6837\u4F8B\uFF1A

profiler start -j 256

\u5404\u7EBF\u7A0B\u5206\u522B\u8FDB\u884C profiling

\u53EF\u4EE5\u4F7F\u7528 -t \u6216 --threads \u6807\u5FD7\u9009\u9879\u4EE4 profiling \u5BF9\u5404\u7EBF\u7A0B\u5206\u522B\u8FDB\u884C\uFF0C\u6BCF\u4E2A\u6808\u8F68\u8FF9\u90FD\u4F1A\u4EE5\u6307\u793A\u5355\u4E2A\u7EBF\u7A0B\u7684\u5E27\u7ED3\u675F\u3002

profiler start -t

\u914D\u7F6E include/exclude \u6765\u8FC7\u6EE4\u6570\u636E

\u5982\u679C\u5E94\u7528\u6BD4\u8F83\u590D\u6742\uFF0C\u751F\u6210\u7684\u5185\u5BB9\u5F88\u591A\uFF0C\u60F3\u53EA\u5173\u6CE8\u90E8\u5206 stack traces\uFF0C\u53EF\u4EE5\u901A\u8FC7 --include/--exclude \u8FC7\u6EE4 stack traces\uFF0C--include \u8868\u793A\u5B9A\u4E49\u7684\u5339\u914D\u8868\u8FBE\u5F0F\u5FC5\u987B\u51FA\u73B0\u5728 stack traces\uFF0C\u76F8\u53CD --exclude \u8868\u793A\u5B9A\u4E49\u7684\u5339\u914D\u8868\u8FBE\u5F0F\u4E00\u5B9A\u4E0D\u4F1A\u51FA\u73B0\u5728 stack traces\u3002 \u5339\u914D\u8868\u8FBE\u5F0F\u53EF\u4EE5\u4EE5*\u5F00\u59CB\u6216\u8005\u7ED3\u675F,* \u8868\u793A\u4EFB\u4F55\uFF08\u53EF\u80FD\u4E3A\u7A7A\uFF09\u5B57\u7B26\u5E8F\u5217\u3002 \u6BD4\u5982

profiler stop --include 'java/*' --include 'com/demo/*' --exclude '*Unsafe.park*'

--include/--exclude \u90FD\u652F\u6301\u591A\u6B21\u8BBE\u7F6E\uFF0C\u4F46\u662F\u9700\u8981\u914D\u7F6E\u5728\u547D\u4EE4\u884C\u7684\u6700\u540E\u3002\u4E5F\u53EF\u4F7F\u7528\u77ED\u53C2\u6570\u683C\u5F0F -I/-X\u3002 \u6CE8\u610F--include/--exclude\u53EA\u652F\u6301\u5728stopaction\u6216\u8005\u5E26\u6709-d/--duration\u53C2\u6570\u7684startaction\u4E2D\u6307\u5B9A\uFF0C\u5426\u5219\u4E0D\u751F\u6548\u3002

\u6307\u5B9A\u6267\u884C\u65F6\u95F4

\u6BD4\u5982\uFF0C\u5E0C\u671B profiler \u6267\u884C 300 \u79D2\u81EA\u52A8\u7ED3\u675F\uFF0C\u53EF\u4EE5\u7528 -d/--duration \u53C2\u6570\u4E3A collect action \u6307\u5B9A\u65F6\u95F4\uFF1A

profiler collect --duration 300

\u751F\u6210 jfr \u683C\u5F0F\u7ED3\u679C

\u6CE8\u610F\uFF0Cjfr \u53EA\u652F\u6301\u5728 start\u65F6\u914D\u7F6E\u3002\u5982\u679C\u662F\u5728stop\u65F6\u6307\u5B9A\uFF0C\u5219\u4E0D\u4F1A\u751F\u6548\u3002

profiler start --file /tmp/test.jfr
profiler start -o jfr

file\u53C2\u6570\u652F\u6301\u4E00\u4E9B\u53D8\u91CF\uFF1A

\u65F6\u95F4\u6233\uFF1A --file /tmp/test-%t.jfr
\u8FDB\u7A0B ID\uFF1A --file /tmp/test-%p.jfr

\u751F\u6210\u7684\u7ED3\u679C\u53EF\u4EE5\u7528\u652F\u6301 jfr \u683C\u5F0F\u7684\u5DE5\u5177\u6765\u67E5\u770B\u3002\u6BD4\u5982\uFF1A

JDK Mission Control \uFF1A https://github.com/openjdk/jmc
JProfiler \uFF1A https://github.com/alibaba/arthas/issues/1416

\u63A7\u5236\u5206\u6790\u7ED3\u679C\u7684\u683C\u5F0F

`,25),ne=a("\u4F7F\u7528 "),ie=e("code",null,"-s",-1),re=a(" \u9009\u9879\u5C06\u7ED3\u679C\u4E2D\u7684 Fully qualified name \u66FF\u6362\u4E3A\u7B80\u5355\u540D\u79F0\uFF0C\u5982 "),de=e("code",null,"demo.MathGame.main",-1),te=a(" \u66FF\u6362\u4E3A "),le=e("code",null,"MathGame.main",-1),oe=a("\u3002\u4F7F\u7528 "),ce=e("code",null,"-g",-1),pe=a(" \u9009\u9879\u6307\u5B9A\u8F93\u51FA\u65B9\u6CD5\u7B7E\u540D\uFF0C\u5982 "),he=e("code",null,"demo.MathGame.main",-1),ue=a(" \u66FF\u6362\u4E3A "),ve=e("code",null,"demo.MathGame.main([Ljava/lang/String;)V",-1),me=a("\u3002\u6B64\u5916\u8FD8\u6709\u8BB8\u591A\u53EF\u8C03\u6574\u5206\u6790\u7ED3\u679C\u683C\u5F0F\u7684\u9009\u9879\uFF0C\u53EF\u53C2\u8003 "),be={href:"https://github.com/async-profiler/async-profiler#readme",target:"_blank",rel:"noopener noreferrer"},fe=a("async-profiler \u7684 README \u6587\u6863"),ge=a(" \u4EE5\u53CA "),_e={href:"https://github.com/async-profiler/async-profiler/discussions",target:"_blank",rel:"noopener noreferrer"},xe=a("async-profiler \u7684 Github Discussions"),ke=a(" \u7B49\u6750\u6599\u3002"),ye=i(`

\u4F8B\u5982\uFF0C\u4EE5\u4E0B\u547D\u4EE4\u4E2D\uFF0C-s \u5C06\u8F93\u51FA\u4E2D\u7684\u7C7B\u540D\u79F0\u6307\u5B9A\u4E3A\u7B80\u77ED\u683C\u5F0F\uFF0C-g \u663E\u793A\u65B9\u6CD5\u7684\u5B8C\u6574\u7B7E\u540D\uFF0C-a \u6807\u6CE8\u51FA Java \u65B9\u6CD5\uFF0C-l \u4E3A\u539F\u751F\u65B9\u6CD5\u589E\u52A0\u5E93\u540D\u79F0\uFF0C--title \u4E3A\u751F\u6210\u706B\u7130\u56FE\u9875\u9762\u6307\u5B9A\u6807\u9898\uFF0C--minwidth \u5C06\u8FC7\u6EE4\u706B\u7130\u56FE\u4E2D\u5BBD\u5EA6\u4E3A 15% \u4EE5\u4E0B\u7684\u5E27\uFF0C--reverse \u5C06\u706B\u7130\u56FE\u5012\u7F6E\u3002

profiler stop -s -g -a -l --title <flametitle> --minwidth 15 --reverse

\u751F\u6210\u7684\u706B\u7130\u56FE\u91CC\u7684 unknown

https://github.com/jvm-profiling-tools/async-profiler/discussions/409

\u914D\u7F6E locks/allocations \u6A21\u5F0F\u7684\u9608\u503C

\u5F53\u4F7F\u7528 lock \u6216 alloc event \u8FDB\u884C profiling \u65F6\uFF0C\u53EF\u4EE5\u4F7F\u7528 --lock \u6216 --alloc \u914D\u7F6E\u9608\u503C\uFF0C\u6BD4\u5982\u4E0B\u5217\u547D\u4EE4\uFF1A

profiler start -e lock --lock 10ms
profiler start -e alloc --alloc 2m

\u4F1A\u8BB0\u5F55\u7ADE\u4E89\u65F6\u95F4\u8D85\u8FC7 10ms \u7684\u9501\uFF08\u5982\u679C\u4E0D\u6307\u5B9A\u65F6\u95F4\u5355\u4F4D\uFF0C\u5219\u4F7F\u7528 ns \u4E3A\u5355\u4F4D\uFF09\uFF0C\u6216\u8005\u4EE5 2MB \u7684\u5355\u4F4D\u8BB0\u5F55\u5BF9\u5185\u5B58\u7684\u5206\u914D\u3002

\u914D\u7F6E JFR \u5757

\u5F53\u4F7F\u7528 JFR \u4F5C\u4E3A\u8F93\u51FA\u683C\u5F0F\u65F6\uFF0C\u53EF\u4EE5\u4F7F\u7528 --chunksize \u6216 --chunktime \u914D\u7F6E\u5355\u4E2A JFR \u5757\u7684\u5927\u81F4\u5BB9\u91CF\uFF08\u4EE5 byte \u4E3A\u5355\u4F4D\uFF0C\u9ED8\u8BA4 100 MB\uFF09\u548C\u65F6\u95F4\u9650\u5236\uFF08\u9ED8\u8BA4\u503C\u4E3A 1 \u5C0F\u65F6\uFF09\uFF0C\u6BD4\u5982\uFF1A

profiler start -f profile.jfr --chunksize 100m --chunktime 1h

\u5C06\u7EBF\u7A0B\u6309\u7167\u8C03\u5EA6\u7B56\u7565\u5206\u7EC4

\u53EF\u4EE5\u4F7F\u7528 --sched \u6807\u5FD7\u9009\u9879\u5C06\u8F93\u51FA\u7ED3\u679C\u6309\u7167 Linux \u7EBF\u7A0B\u8C03\u5EA6\u7B56\u7565\u5206\u7EC4\uFF0C\u7B56\u7565\u5305\u62EC BATCH/IDLE/OTHER\u3002\u4F8B\u5982\uFF1A

profiler start --sched

\u706B\u7130\u56FE\u7684\u5012\u6570\u7B2C\u4E8C\u884C\u4F1A\u6807\u8BB0\u4E0D\u540C\u7684\u8C03\u5EA6\u7B56\u7565\u3002

\u4EC5\u7528\u672A\u9500\u6BC1\u5BF9\u8C61\u6784\u5EFA\u5185\u5B58\u5206\u6790\u7ED3\u679C

\u4F7F\u7528 --live \u6807\u5FD7\u9009\u9879\u5728\u5185\u5B58\u5206\u6790\u7ED3\u679C\u4E2D\u4EC5\u4FDD\u7559\u90A3\u4E9B\u5728\u5206\u6790\u8FC7\u7A0B\u7ED3\u675F\u65F6\u4ECD\u672A\u88AB JVM \u56DE\u6536\u7684\u5BF9\u8C61\u3002\u8BE5\u9009\u9879\u5728\u6392\u67E5 Java \u5806\u5185\u5B58\u6CC4\u9732\u95EE\u9898\u65F6\u6BD4\u8F83\u6709\u7528\u3002

profiler start --live

\u914D\u7F6E\u6536\u96C6 C \u6808\u5E27\u7684\u65B9\u6CD5

\u4F7F\u7528 --cstack MODE \u914D\u7F6E\u6536\u96C6 native \u5E27\u7684\u65B9\u6CD5\u3002\u5019\u9009\u6A21\u5F0F\u6709 fp (Frame Pointer), dwarf (DWARF unwind info), lbr (Last Branch Record, \u4ECE Linux 4.1 \u5728 Haswell \u53EF\u7528), and no (\u4E0D\u6536\u96C6 native \u6808\u5E27).

\u9ED8\u8BA4\u60C5\u51B5\u4E0B\uFF0CC \u6808\u5E27\u4F1A\u51FA\u73B0\u5728 cpu\u3001itimer\u3001wall-clock\u3001perf-events \u6A21\u5F0F\u4E2D\uFF0C\u800C Java \u7EA7\u522B\u7684 event \u6BD4\u5982 alloc \u548C lock \u53EA\u6536\u96C6 Java stack\u3002

profiler --cstack fp

\u6B64\u547D\u4EE4\u5C06\u6536\u96C6 native \u6808\u5E27\u7684 Frame Pointer \u4FE1\u606F\u3002

\u5F53\u6307\u5B9A native \u51FD\u6570\u6267\u884C\u65F6\u5F00\u59CB/\u505C\u6B62 profiling

\u4F7F\u7528 --begin function \u548C --end function \u9009\u9879\u5728\u6307\u5B9A native \u51FD\u6570\u88AB\u6267\u884C\u65F6\u8BA9 profiling \u8FC7\u7A0B\u542F\u52A8\u6216\u7EC8\u6B62\u3002\u4E3B\u8981\u7528\u9014\u662F\u5206\u6790\u7279\u5B9A\u7684 JVM \u9636\u6BB5\uFF0C\u6BD4\u5982 GC \u548C\u5B89\u5168\u70B9\u3002\u9700\u8981\u4F7F\u7528\u7279\u5B9A JVM \u5B9E\u73B0\u4E2D\u7684 native \u51FD\u6570\u540D\uFF0C\u6BD4\u5982 HotSpot JVM \u4E2D\u7684 SafepointSynchronize::begin \u548C SafepointSynchronize::end\u3002

Time-to-safepoint profiling

\u9009\u9879 --ttsp \u5B9E\u9645\u4E0A\u662F --begin SafepointSynchronize::begin --end RuntimeService::record_safepoint_synchronized \u7684\u4E00\u4E2A\u522B\u540D\u3002\u5B83\u662F\u4E00\u79CD\u7EA6\u675F\u800C\u4E0D\u662F\u72EC\u7ACB\u7684 event \u7C7B\u578B\u3002\u65E0\u8BBA\u9009\u62E9\u54EA\u79CD event\uFF0Cprofiler \u90FD\u53EF\u4EE5\u6B63\u5E38\u5DE5\u4F5C\uFF0C\u4F46\u53EA\u6709 VM \u64CD\u4F5C\u548C safepoint request \u4E4B\u95F4\u7684\u4E8B\u4EF6\u4F1A\u88AB\u8BB0\u5F55\u4E0B\u6765\u3002

profiler start --begin SafepointSynchronize::begin --end RuntimeService::record_safepoint_synchronized
profiler --ttsp

\u4F7F\u7528 profiler \u8BB0\u5F55\u7684 event \u751F\u6210 JFR \u6587\u4EF6

\u7528 --jfrsync CONFIG \u9009\u9879\u53EF\u4EE5\u6307\u5B9A\u914D\u7F6E\u542F\u52A8 Java Flight Recording\uFF0C\u8F93\u51FA\u7684 jfr \u6587\u4EF6\u4F1A\u5305\u542B\u6240\u6709\u5E38\u89C4\u7684 JFR event\uFF0C\u4F46\u91C7\u6837\u7684\u6765\u6E90\u662F\u7531 profiler \u63D0\u4F9B\u7684\u3002

`,30),je=e("code",null,"CONFIG",-1),Je=a(" \u9009\u9879\u53EF\u4EE5\u662F "),Se=e("code",null,"profile",-1),Fe=a("\uFF0C\u8868\u793A\u4F7F\u7528\u5728 "),Me=e("code",null,"$JAVA_HOME/lib/jfr",-1),Re=a(" \u76EE\u5F55\u4E0B\u9884\u7F6E\u7684\u201Cprofile\u201D\u914D\u7F6E\uFF0C\u4E5F\u53EF\u4EE5\u662F\u81EA\u5B9A\u4E49\u7684 JFR \u914D\u7F6E\u6587\u4EF6\uFF08.jfc\uFF09\uFF0C\u6B64\u9009\u9879\u7684\u503C\u91C7\u7528\u4E0E "),Be={href:"https://docs.oracle.com/en/java/javase/17/docs/specs/man/jcmd.html",target:"_blank",rel:"noopener noreferrer"},Ce=a("JFR.start \u547D\u4EE4\u7684 settings \u9009\u9879"),we=a(" \u76F8\u540C\u7684\u683C\u5F0F\u3002"),Ge=i(`

\u6BD4\u5982\uFF0C\u4EE5\u4E0B\u547D\u4EE4\u4F7F\u7528\u201Cprofile\u201D\u914D\u7F6E\u542F\u52A8 JFR\uFF1A

profiler start -e cpu --jfrsync profile -f combined.jfr

\u5468\u671F\u6027\u4FDD\u5B58\u7ED3\u679C

\u4F7F\u7528 --loop TIME \u53EF\u4EE5\u6301\u7EED\u8FD0\u884C profiler \u5E76\u5468\u671F\u6027\u4FDD\u5B58\u7ED3\u679C\u3002\u9009\u9879\u683C\u5F0F\u53EF\u4EE5\u662F\u5177\u4F53\u65F6\u95F4 hh:mm:ss \u6216\u4EE5\u79D2\u3001\u5206\u949F\u3001\u5C0F\u65F6\u6216\u5929\u8BA1\u7B97\u7684\u65F6\u95F4\u95F4\u9694\u3002\u9700\u8981\u786E\u4FDD\u6307\u5B9A\u7684\u8F93\u51FA\u6587\u4EF6\u540D\u4E2D\u5305\u542B\u65F6\u95F4\u6233\uFF0C\u5426\u5219\u6BCF\u6B21\u8F93\u51FA\u7684\u7ED3\u679C\u90FD\u4F1A\u8986\u76D6\u4E0A\u6B21\u4FDD\u5B58\u7684\u7ED3\u679C\u3002\u4EE5\u4E0B\u547D\u4EE4\u6301\u7EED\u6267\u884C profiling \u5E76\u5C06\u6BCF\u4E2A\u5C0F\u65F6\u5185\u7684\u8BB0\u5F55\u4FDD\u5B58\u5230\u4E00\u4E2A jfr \u6587\u4EF6\u4E2D\u3002

profiler start --loop 1h -f /var/log/profile-%t.jfr

`--timeout` \u9009\u9879

`,6),$e=a("\u8FD9\u4E2A\u9009\u9879\u6307\u5B9A profiling \u81EA\u52A8\u5728\u591A\u4E45\u540E\u505C\u6B62\u3002\u8BE5\u9009\u9879\u548C "),De=e("code",null,"--loop",-1),Ee=a(" \u9009\u9879\u7684\u683C\u5F0F\u4E00\u81F4\uFF0C\u53EF\u4EE5\u662F\u65F6\u95F4\u70B9\uFF0C\u4E5F\u53EF\u4EE5\u662F\u4E00\u4E2A\u65F6\u95F4\u95F4\u9694\u3002\u8FD9\u4E24\u4E2A\u9009\u9879\u90FD\u662F\u7528\u4E8E "),Le=e("code",null,"start",-1),Ae=a(" action \u800C\u4E0D\u662F "),Ne=e("code",null,"collect",-1),Ve=a(" action \u7684\u3002\u53EF\u53C2\u8003 "),Oe={href:"https://github.com/async-profiler/async-profiler/discussions/789",target:"_blank",rel:"noopener noreferrer"},ze=a("async-profiler Github Discussions"),Ie=a(" \u4E86\u89E3\u66F4\u591A\u4FE1\u606F\u3002");function Te(Ke,qe){const s=c("ExternalLinkIcon");return l(),o("div",null,[h,e("p",null,[e("a",u,[v,m,n(s)])]),e("div",b,[f,e("p",null,[g,e("a",_,[x,n(s)]),k])]),y,j,e("p",null,[J,S,e("a",F,[M,n(s)]),R]),B,e("p",null,[C,e("a",w,[G,n(s)]),$,D,E,L,A,N,V]),O,e("p",null,[z,e("a",I,[T,n(s)]),K,q,H]),P,e("p",null,[U,e("a",W,[X,n(s)]),Q]),Y,e("p",null,[Z,e("a",ee,[ae,n(s)])]),se,e("p",null,[ne,ie,re,de,te,le,oe,ce,pe,he,ue,ve,me,e("a",be,[fe,n(s)]),ge,e("a",_e,[xe,n(s)]),ke]),ye,e("p",null,[je,Je,Se,Fe,Me,Re,e("a",Be,[Ce,n(s)]),we]),Ge,e("p",null,[$e,De,Ee,Le,Ae,Ne,Ve,e("a",Oe,[ze,n(s)]),Ie])])}const Ue=t(p,[["render",Te],["__file","profiler.html.vue"]]);export{Ue as default};

# \u53C2\u6570\u8BF4\u660E

# \u542F\u52A8 profiler

# \u83B7\u53D6\u5DF2\u91C7\u96C6\u7684 sample \u7684\u6570\u91CF

# \u67E5\u770B profiling \u72B6\u6001

# \u67E5\u770B profiler \u81EA\u8EAB\u7684\u5185\u5B58\u5360\u7528

# \u505C\u6B62 profiler

# \u751F\u6210\u706B\u7130\u56FE\u683C\u5F0F\u7ED3\u679C

# \u901A\u8FC7\u6D4F\u89C8\u5668\u67E5\u770B arthas-output \u4E0B\u9762\u7684 profiler \u7ED3\u679C

# profiler \u652F\u6301\u7684 events

# \u6062\u590D\u91C7\u6837

# Dump \u5206\u6790\u7ED3\u679C

# \u4F7F\u7528execute\u6765\u6267\u884C\u590D\u6742\u7684\u547D\u4EE4

# \u67E5\u770B\u6240\u6709\u652F\u6301\u7684 action

# \u67E5\u770B\u7248\u672C

# \u914D\u7F6E Java \u6808\u6DF1\u5EA6

# \u5404\u7EBF\u7A0B\u5206\u522B\u8FDB\u884C profiling

# \u914D\u7F6E include/exclude \u6765\u8FC7\u6EE4\u6570\u636E

# \u6307\u5B9A\u6267\u884C\u65F6\u95F4

# \u751F\u6210 jfr \u683C\u5F0F\u7ED3\u679C

# \u63A7\u5236\u5206\u6790\u7ED3\u679C\u7684\u683C\u5F0F

# \u751F\u6210\u7684\u706B\u7130\u56FE\u91CC\u7684 unknown

# \u914D\u7F6E locks/allocations \u6A21\u5F0F\u7684\u9608\u503C

# \u914D\u7F6E JFR \u5757

# \u5C06\u7EBF\u7A0B\u6309\u7167\u8C03\u5EA6\u7B56\u7565\u5206\u7EC4

# \u4EC5\u7528\u672A\u9500\u6BC1\u5BF9\u8C61\u6784\u5EFA\u5185\u5B58\u5206\u6790\u7ED3\u679C

# \u914D\u7F6E\u6536\u96C6 C \u6808\u5E27\u7684\u65B9\u6CD5

# \u5F53\u6307\u5B9A native \u51FD\u6570\u6267\u884C\u65F6\u5F00\u59CB/\u505C\u6B62 profiling

# Time-to-safepoint profiling

# \u4F7F\u7528 profiler \u8BB0\u5F55\u7684 event \u751F\u6210 JFR \u6587\u4EF6

# \u5468\u671F\u6027\u4FDD\u5B58\u7ED3\u679C

# --timeout \u9009\u9879