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Started [cpu] profiling
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < / div > < / div > < div class = "custom-container tip" > < p class = "custom-container-title" > 提示< / p > < p > 默认情况下，生成的是 cpu 的火焰图，即 event 为< code > cpu< / code > 。可以用< code > --event< / code > 参数指定其他性能分析模式，见下文。< / p > < / div > < h2 id = "获取已采集的-sample-的数量" tabindex = "-1" > < a class = "header-anchor" href = "#获取已采集的-sample-的数量" aria-hidden = "true" > #< / a > 获取已采集的 sample 的数量< / h2 > < div class = "language-text ext-text line-numbers-mode" > < pre class = "language-text" > < code > $ profiler getSamples
23
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < / div > < / div > < h2 id = "查看-profiling-状态" tabindex = "-1" > < a class = "header-anchor" href = "#查看-profiling-状态" aria-hidden = "true" > #< / a > 查看 profiling 状态< / h2 > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > $ profiler status
< span class = "token punctuation" > [< / span > cpu< span class = "token punctuation" > ]< / span > profiling is running < span class = "token keyword" > for< / span > < span class = "token number" > 4< / span > seconds
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < / div > < / div > < p > 可以查看当前 profiler 在采样哪种< code > event< / code > 和采样时间。< / p > < h2 id = "查看-profiler-自身的内存占用" tabindex = "-1" > < a class = "header-anchor" href = "#查看-profiler-自身的内存占用" aria-hidden = "true" > #< / a > 查看 profiler 自身的内存占用< / h2 > < div class = "language-text ext-text line-numbers-mode" > < pre class = "language-text" > < code > $ profiler meminfo
Call trace storage: 10244 KB
Dictionaries: 72 KB
Code cache: 12890 KB
------------------------------
Total: 23206 KB
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < / div > < / div > < h2 id = "停止-profiler" tabindex = "-1" > < a class = "header-anchor" href = "#停止-profiler" aria-hidden = "true" > #< / a > 停止 profiler< / h2 > < h3 id = "生成火焰图格式结果" tabindex = "-1" > < a class = "header-anchor" href = "#生成火焰图格式结果" aria-hidden = "true" > #< / a > 生成火焰图格式结果< / h3 > < p > 默认情况下，结果是 < a href = "https://github.com/BrendanGregg/FlameGraph" target = "_blank" rel = "noopener noreferrer" > Flame Graph< span > < svg class = "external-link-icon" xmlns = "http://www.w3.org/2000/svg" aria-hidden = "true" focusable = "false" x = "0px" y = "0px" viewbox = "0 0 100 100" width = "15" height = "15" > < path fill = "currentColor" d = "M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z" > < / path > < polygon fill = "currentColor" points = "45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9" > < / polygon > < / svg > < span class = "external-link-icon-sr-only" > 在新窗口打开< / span > < / span > < / a > 格式的 < code > html< / code > 文件，也可以用 < code > -o< / code > 或 < code > --format< / code > 参数指定其他内容格式，包括 flat、traces、collapsed、flamegraph、tree、jfr。< / p > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > $ profiler stop < span class = "token parameter variable" > --format< / span > flamegraph
profiler output file: /tmp/test/arthas-output/20211207-111550.html
OK
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < / div > < / div > < p > 在< code > --file< / code > 参数指定的文件名后缀为 < code > html< / code > 或 < code > jfr< / code > 时，文件格式可以被推断出来。比如< code > --file /tmp/result.html< / code > 将自动生成火焰图。< / p > < h2 id = "通过浏览器查看-arthas-output-下面的-profiler-结果" tabindex = "-1" > < a class = "header-anchor" href = "#通过浏览器查看-arthas-output-下面的-profiler-结果" aria-hidden = "true" > #< / a > 通过浏览器查看 arthas-output 下面的 profiler 结果< / h2 > < p > 默认情况下， < a href = "http://localhost:3658/arthas-output/" target = "_blank" rel = "noopener noreferrer" > http://localhost:3658/arthas-output/< span > < svg class = "external-link-icon" xmlns = "http://www.w3.org/2000/svg" aria-hidden = "true" focusable = "false" x = "0px" y = "0px" viewbox = "0 0 100 100" width = "15" height = "15" > < path fill = "currentColor" d = "M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z" > < / path > < polygon fill = "currentColor" points = "45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9" > < / polygon > < / svg > < span class = "external-link-icon-sr-only" > 在新窗口打开< / span > < / span > < / a > 查看到< code > arthas-output< / code > 目录下面的 profiler 结果：< / p > < p > < img src = "/images/arthas-output.jpg" alt = "" > < / p > < p > 点击可以查看具体的结果：< / p > < p > < img src = "/images/arthas-output-svg.jpg" alt = "" > < / p > < div class = "custom-container tip" > < p class = "custom-container-title" > 提示< / p > < p > 如果是 chrome 浏览器，可能需要多次刷新。< / p > < / div > < h2 id = "profiler-支持的-events" tabindex = "-1" > < a class = "header-anchor" href = "#profiler-支持的-events" aria-hidden = "true" > #< / a > profiler 支持的 events< / h2 > < p > 在不同的平台，不同的 OS 下面，支持的 events 各有不同。比如在 macos 下面：< / p > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > $ profiler list
Basic events:
cpu
alloc
lock
wall
itimer
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < / div > < / div > < p > 在 linux 下面< / p > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > $ 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
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < / div > < / div > < p > 如果遇到 OS 本身的权限/配置问题，然后缺少部分 event， < a href = "https://github.com/jvm-profiling-tools/async-profiler" target = "_blank" rel = "noopener noreferrer" > async-profiler 的文档< span > < svg class = "external-link-icon" xmlns = "http://www.w3.org/2000/svg" aria-hidden = "true" focusable = "false" x = "0px" y = "0px" viewbox = "0 0 100 100" width = "15" height = "15" > < path fill = "currentColor" d = "M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z" > < / path > < polygon fill = "currentColor" points = "45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9" > < / polygon > < / svg > < span class = "external-link-icon-sr-only" > 在新窗口打开< / span > < / span > < / a > 。< / p > < p > 可以使用 < code > check< / code > action 测试某个 event 是否可用，此 action 的参数格式与 start 一致。< / p > < p > 可以用< code > --event< / code > 参数指定要采样的事件，比如 < code > alloc< / code > 表示分析内存分配情况：< / p > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > $ profiler start < span class = "token parameter variable" > --event< / span > alloc
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < / div > < / div > < h2 id = "恢复采样" tabindex = "-1" > < a class = "header-anchor" href = "#恢复采样" aria-hidden = "true" > #< / a > 恢复采样< / h2 > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > $ profiler resume
Started < span class = "token punctuation" > [< / span > cpu< span class = "token punctuation" > ]< / span > profiling
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < / div > < / div > < p > < code > start< / code > 和< code > resume< / code > 的区别是：< code > start< / code > 会清除已有的分析结果重新开始，< code > resume< / code > 则会保留已有的结果，将新的分析结果附加到已有结果中。< / p > < p > 通过执行< code > profiler getSamples< / code > 可以查看 samples 的数量来验证。< / p > < h2 id = "dump-分析结果" tabindex = "-1" > < a class = "header-anchor" href = "#dump-分析结果" aria-hidden = "true" > #< / a > Dump 分析结果< / h2 > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > $ profiler dump
OK
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < / div > < / div > < p > < code > dump< / code > action 将性能分析的结果保存到默认文件或指定的文件中，但 profiling 过程不会停止。例如，如果使用 < code > start< / code > action 启动 profiling， < code > dump< / code > action， < code > dump< / code > action， < / p > < h2 id = "使用execute来执行复杂的命令" tabindex = "-1" > < a class = "header-anchor" href = "#使用execute来执行复杂的命令" aria-hidden = "true" > #< / a > 使用< code > execute< / code > 来执行复杂的命令< / h2 > < p > 比如开始采样：< / p > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > profiler execute < span class = "token string" > ' start,framebuf=5000000' < / span >
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < / div > < / div > < p > 停止采样，并保存到指定文件里：< / p > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > profiler execute < span class = "token string" > ' stop,file=/tmp/result.html' < / span >
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < / div > < / div > < p > 具体的格式参考： < a href = "https://github.com/async-profiler/async-profiler/blob/v2.9/src/arguments.cpp#L52" target = "_blank" rel = "noopener noreferrer" > arguments.cpp< span > < svg class = "external-link-icon" xmlns = "http://www.w3.org/2000/svg" aria-hidden = "true" focusable = "false" x = "0px" y = "0px" viewbox = "0 0 100 100" width = "15" height = "15" > < path fill = "currentColor" d = "M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z" > < / path > < polygon fill = "currentColor" points = "45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9" > < / polygon > < / svg > < span class = "external-link-icon-sr-only" > 在新窗口打开< / span > < / span > < / a > < / p > < h2 id = "查看所有支持的-action" tabindex = "-1" > < a class = "header-anchor" href = "#查看所有支持的-action" aria-hidden = "true" > #< / a > 查看所有支持的 action< / h2 > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > $ profiler actions
Supported Actions: < span class = "token punctuation" > [< / span > resume, dumpCollapsed, getSamples, start, list, version, execute, meminfo, stop, load, dumpFlat, dump, actions, dumpTraces, status, check< span class = "token punctuation" > ]< / span >
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < / div > < / div > < h2 id = "查看版本" tabindex = "-1" > < a class = "header-anchor" href = "#查看版本" aria-hidden = "true" > #< / a > 查看版本< / h2 > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > $ profiler version
Async-profiler < span class = "token number" > 2.9< / span > built on May < span class = "token number" > 8< / span > < span class = "token number" > 2023< / span >
Copyright < span class = "token number" > 2016< / span > -2021 Andrei Pangin
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < / div > < / div > < h2 id = "配置-java-栈深度" tabindex = "-1" > < a class = "header-anchor" href = "#配置-java-栈深度" aria-hidden = "true" > #< / a > 配置 Java 栈深度< / h2 > < p > 可以使用 < code > -j< / code > 或 < code > --jstackdepth< / code > 选项指定最大 Java 栈深度。如果指定值大于默认值 2048， ， ， ： < / p > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > profiler start < span class = "token parameter variable" > -j< / span > < span class = "token number" > 256< / span >
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < / div > < / div > < h2 id = "各线程分别进行-profiling" tabindex = "-1" > < a class = "header-anchor" href = "#各线程分别进行-profiling" aria-hidden = "true" > #< / a > 各线程分别进行 profiling< / h2 > < p > 可以使用 < code > -t< / code > 或 < code > --threads< / code > 标志选项令 profiling 对各线程分别进行，每个栈轨迹都会以指示单个线程的帧结束。< / p > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > profiler start < span class = "token parameter variable" > -t< / span >
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < / div > < / div > < h2 id = "配置-include-exclude-来过滤数据" tabindex = "-1" > < a class = "header-anchor" href = "#配置-include-exclude-来过滤数据" aria-hidden = "true" > #< / a > 配置 include/exclude 来过滤数据< / h2 > < p > 如果应用比较复杂，生成的内容很多，想只关注部分 stack traces， < code > --include/--exclude< / code > 过滤 stack traces， < code > --include< / code > 表示定义的匹配表达式必须出现在 stack traces， < code > --exclude< / code > 表示定义的匹配表达式一定不会出现在 stack traces。 匹配表达式可以以< code > *< / code > 开始或者结束,< code > *< / code > 表示任何（可能为空）字符序列。 比如< / p > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > profiler stop < span class = "token parameter variable" > --include< / span > < span class = "token string" > ' java/*' < / span > < span class = "token parameter variable" > --include< / span > < span class = "token string" > ' com/demo/*' < / span > < span class = "token parameter variable" > --exclude< / span > < span class = "token string" > ' *Unsafe.park*' < / span >
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < / div > < / div > < blockquote > < p > < code > --include/--exclude< / code > 都支持多次设置，但是需要配置在命令行的最后。也可使用短参数格式 < code > -I/-X< / code > 。 注意< code > --include/--exclude< / code > 只支持在< code > stop< / code > action或者带有< code > -d< / code > /< code > --duration< / code > 参数的< code > start< / code > action中指定， < / p > < / blockquote > < h2 id = "指定执行时间" tabindex = "-1" > < a class = "header-anchor" href = "#指定执行时间" aria-hidden = "true" > #< / a > 指定执行时间< / h2 > < p > 比如，希望 profiler 执行 300 秒自动结束，可以用 < code > -d< / code > /< code > --duration< / code > 参数为 collect action 指定时间：< / p > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > profiler collect < span class = "token parameter variable" > --duration< / span > < span class = "token number" > 300< / span >
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < / div > < / div > < h2 id = "生成-jfr-格式结果" tabindex = "-1" > < a class = "header-anchor" href = "#生成-jfr-格式结果" aria-hidden = "true" > #< / a > 生成 jfr 格式结果< / h2 > < blockquote > < p > 注意， < code > start< / code > 时配置。如果是在< code > stop< / code > 时指定，则不会生效。< / p > < / blockquote > < div class = "language-text ext-text line-numbers-mode" > < pre class = "language-text" > < code > profiler start --file /tmp/test.jfr
profiler start -o jfr
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < / div > < / div > < p > < code > file< / code > 参数支持一些变量：< / p > < ul > < li > 时间戳： < code > --file /tmp/test-%t.jfr< / code > < / li > < li > 进程 ID： < code > --file /tmp/test-%p.jfr< / code > < / li > < / ul > < p > 生成的结果可以用支持 jfr 格式的工具来查看。比如：< / p > < ul > < li > JDK Mission Control ： < / li > < li > JProfiler ： < / li > < / ul > < h2 id = "控制分析结果的格式" tabindex = "-1" > < a class = "header-anchor" href = "#控制分析结果的格式" aria-hidden = "true" > #< / a > 控制分析结果的格式< / h2 > < p > 使用 < code > -s< / code > 选项将结果中的 Fully qualified name 替换为简单名称，如 < code > demo.MathGame.main< / code > 替换为 < code > MathGame.main< / code > 。使用 < code > -g< / code > 选项指定输出方法签名，如 < code > demo.MathGame.main< / code > 替换为 < code > demo.MathGame.main([Ljava/lang/String;)V< / code > 。此外还有许多可调整分析结果格式的选项，可参考 < a href = "https://github.com/async-profiler/async-profiler#readme" target = "_blank" rel = "noopener noreferrer" > async-profiler 的 README 文档< span > < svg class = "external-link-icon" xmlns = "http://www.w3.org/2000/svg" aria-hidden = "true" focusable = "false" x = "0px" y = "0px" viewbox = "0 0 100 100" width = "15" height = "15" > < path fill = "currentColor" d = "M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z" > < / path > < polygon fill = "currentColor" points = "45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9" > < / polygon > < / svg > < span class = "external-link-icon-sr-only" > 在新窗口打开< / span > < / span > < / a > 以及 < a href = "https://github.com/async-profiler/async-profiler/discussions" target = "_blank" rel = "noopener noreferrer" > async-profiler 的 Github Discussions< span > < svg class = "external-link-icon" xmlns = "http://www.w3.org/2000/svg" aria-hidden = "true" focusable = "false" x = "0px" y = "0px" viewbox = "0 0 100 100" width = "15" height = "15" > < path fill = "currentColor" d = "M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z" > < / path > < polygon fill = "currentColor" points = "45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9" > < / polygon > < / svg > < span class = "external-link-icon-sr-only" > 在新窗口打开< / span > < / span > < / a > 等材料。< / p > < p > 例如，以下命令中，< code > -s< / code > 将输出中的类名称指定为简短格式，< code > -g< / code > 显示方法的完整签名，< code > -a< / code > 标注出 Java 方法，< code > -l< / code > 为原生方法增加库名称，< code > --title< / code > 为生成火焰图页面指定标题，< code > --minwidth< / code > 将过滤火焰图中宽度为 15% 以下的帧，< code > --reverse< / code > 将火焰图倒置。< / p > < div class = "language-text ext-text line-numbers-mode" > < pre class = "language-text" > < code > profiler stop -s -g -a -l --title < flametitle> --minwidth 15 --reverse
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < / div > < / div > < h2 id = "生成的火焰图里的-unknown" tabindex = "-1" > < a class = "header-anchor" href = "#生成的火焰图里的-unknown" aria-hidden = "true" > #< / a > 生成的火焰图里的 unknown< / h2 > < ul > < li > https://github.com/jvm-profiling-tools/async-profiler/discussions/409< / li > < / ul > < h2 id = "配置-locks-allocations-模式的阈值" tabindex = "-1" > < a class = "header-anchor" href = "#配置-locks-allocations-模式的阈值" aria-hidden = "true" > #< / a > 配置 locks/allocations 模式的阈值< / h2 > < p > 当使用 lock 或 alloc event 进行 profiling 时，可以使用 < code > --lock< / code > 或 < code > --alloc< / code > 配置阈值，比如下列命令：< / p > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > profiler start < span class = "token parameter variable" > -e< / span > lock < span class = "token parameter variable" > --lock< / span > 10ms
profiler start < span class = "token parameter variable" > -e< / span > alloc < span class = "token parameter variable" > --alloc< / span > 2m
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < / div > < / div > < p > 会记录竞争时间超过 10ms 的锁（如果不指定时间单位，则使用 ns 为单位），或者以 2MB 的单位记录对内存的分配。< / p > < h2 id = "配置-jfr-块" tabindex = "-1" > < a class = "header-anchor" href = "#配置-jfr-块" aria-hidden = "true" > #< / a > 配置 JFR 块< / h2 > < p > 当使用 JFR 作为输出格式时，可以使用 < code > --chunksize< / code > 或 < code > --chunktime< / code > 配置单个 JFR 块的大致容量（以 byte 为单位，默认 100 MB） （ < / p > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > profiler start < span class = "token parameter variable" > -f< / span > profile.jfr < span class = "token parameter variable" > --chunksize< / span > 100m < span class = "token parameter variable" > --chunktime< / span > 1h
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < / div > < / div > < h2 id = "将线程按照调度策略分组" tabindex = "-1" > < a class = "header-anchor" href = "#将线程按照调度策略分组" aria-hidden = "true" > #< / a > 将线程按照调度策略分组< / h2 > < p > 可以使用 < code > --sched< / code > 标志选项将输出结果按照 Linux 线程调度策略分组，策略包括 BATCH/IDLE/OTHER。例如： < / p > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > profiler start < span class = "token parameter variable" > --sched< / span >
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < / div > < / div > < p > 火焰图的倒数第二行会标记不同的调度策略。< / p > < h2 id = "仅用未销毁对象构建内存分析结果" tabindex = "-1" > < a class = "header-anchor" href = "#仅用未销毁对象构建内存分析结果" aria-hidden = "true" > #< / a > 仅用未销毁对象构建内存分析结果< / h2 > < p > 使用 < code > --live< / code > 标志选项在内存分析结果中仅保留那些在分析过程结束时仍未被 JVM 回收的对象。该选项在排查 Java 堆内存泄露问题时比较有用。< / p > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > profiler start < span class = "token parameter variable" > --live< / span >
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < / div > < / div > < h2 id = "配置收集-c-栈帧的方法" tabindex = "-1" > < a class = "header-anchor" href = "#配置收集-c-栈帧的方法" aria-hidden = "true" > #< / a > 配置收集 C 栈帧的方法< / h2 > < p > 使用 < code > --cstack MODE< / code > 配置收集 native 帧的方法。候选模式有 fp (Frame Pointer), dwarf (DWARF unwind info), lbr (Last Branch Record, 从 Linux 4.1 在 Haswell 可用), and no (不收集 native 栈帧).< / p > < p > 默认情况下， < / p > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > profiler < span class = "token parameter variable" > --cstack< / span > fp
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < / div > < / div > < p > 此命令将收集 native 栈帧的 Frame Pointer 信息。< / p > < h2 id = "当指定-native-函数执行时开始-停止-profiling" tabindex = "-1" > < a class = "header-anchor" href = "#当指定-native-函数执行时开始-停止-profiling" aria-hidden = "true" > #< / a > 当指定 native 函数执行时开始/停止 profiling< / h2 > < p > 使用 < code > --begin function< / code > 和 < code > --end function< / code > 选项在指定 native 函数被执行时让 profiling 过程启动或终止。主要用途是分析特定的 JVM 阶段，比如 GC 和安全点。需要使用特定 JVM 实现中的 native 函数名，比如 HotSpot JVM 中的 < code > SafepointSynchronize::begin< / code > 和 < code > SafepointSynchronize::end< / code > 。< / p > < h3 id = "time-to-safepoint-profiling" tabindex = "-1" > < a class = "header-anchor" href = "#time-to-safepoint-profiling" aria-hidden = "true" > #< / a > Time-to-safepoint profiling< / h3 > < p > 选项 < code > --ttsp< / code > 实际上是 < code > --begin SafepointSynchronize::begin --end RuntimeService::record_safepoint_synchronized< / code > 的一个别名。它是一种约束而不是独立的 event 类型。无论选择哪种 event， < / p > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > profiler start < span class = "token parameter variable" > --begin< / span > SafepointSynchronize::begin < span class = "token parameter variable" > --end< / span > RuntimeService::record_safepoint_synchronized
profiler < span class = "token parameter variable" > --ttsp< / span >
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < / div > < / div > < h2 id = "使用-profiler-记录的-event-生成-jfr-文件" tabindex = "-1" > < a class = "header-anchor" href = "#使用-profiler-记录的-event-生成-jfr-文件" aria-hidden = "true" > #< / a > 使用 profiler 记录的 event 生成 JFR 文件< / h2 > < p > 用 < code > --jfrsync CONFIG< / code > 选项可以指定配置启动 Java Flight Recording， ， < / p > < p > < code > CONFIG< / code > 选项可以是 < code > profile< / code > ，表示使用在 < code > $JAVA_HOME/lib/jfr< / code > 目录下预置的“profile”配置， ） ， < a href = "https://docs.oracle.com/en/java/javase/17/docs/specs/man/jcmd.html" target = "_blank" rel = "noopener noreferrer" > JFR.start 命令的 settings 选项< span > < svg class = "external-link-icon" xmlns = "http://www.w3.org/2000/svg" aria-hidden = "true" focusable = "false" x = "0px" y = "0px" viewbox = "0 0 100 100" width = "15" height = "15" > < path fill = "currentColor" d = "M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z" > < / path > < polygon fill = "currentColor" points = "45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9" > < / polygon > < / svg > < span class = "external-link-icon-sr-only" > 在新窗口打开< / span > < / span > < / a > 相同的格式。< / p > < p > 比如， ： < / p > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > profiler start < span class = "token parameter variable" > -e< / span > cpu < span class = "token parameter variable" > --jfrsync< / span > profile < span class = "token parameter variable" > -f< / span > combined.jfr
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < / div > < / div > < h2 id = "周期性保存结果" tabindex = "-1" > < a class = "header-anchor" href = "#周期性保存结果" aria-hidden = "true" > #< / a > 周期性保存结果< / h2 > < p > 使用 < code > --loop TIME< / code > 可以持续运行 profiler 并周期性保存结果。选项格式可以是具体时间 hh:mm:ss 或以秒、分钟、小时或天计算的时间间隔。需要确保指定的输出文件名中包含时间戳，否则每次输出的结果都会覆盖上次保存的结果。以下命令持续执行 profiling 并将每个小时内的记录保存到一个 jfr 文件中。< / p > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > profiler start < span class = "token parameter variable" > --loop< / span > 1h < span class = "token parameter variable" > -f< / span > /var/log/profile-%t.jfr
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < / div > < / div > < h2 id = "timeout-选项" tabindex = "-1" > < a class = "header-anchor" href = "#timeout-选项" aria-hidden = "true" > #< / a > < code > --timeout< / code > 选项< / h2 > < p > 这个选项指定 profiling 自动在多久后停止。该选项和 < code > --loop< / code > 选项的格式一致，可以是时间点，也可以是一个时间间隔。这两个选项都是用于 < code > start< / code > action 而不是 < code > collect< / code > action 的。可参考 < a href = "https://github.com/async-profiler/async-profiler/discussions/789" target = "_blank" rel = "noopener noreferrer" > async-profiler Github Discussions< span > < svg class = "external-link-icon" xmlns = "http://www.w3.org/2000/svg" aria-hidden = "true" focusable = "false" x = "0px" y = "0px" viewbox = "0 0 100 100" width = "15" height = "15" > < path fill = "currentColor" d = "M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z" > < / path > < polygon fill = "currentColor" points = "45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9" > < / polygon > < / svg > < span class = "external-link-icon-sr-only" > 在新窗口打开< / span > < / span > < / a > 了解更多信息。< / p > < / div > <!-- [ --> <!-- ] --> < / div > < footer class = "page-meta right-menu-padding" data-v-fdd717e0 > < div class = "meta-item edit-link" > < a class = "external-link meta-item-label" href = "https://github.com/alibaba/arthas/edit/master/site/docs/doc/profiler.md" rel = "noopener noreferrer" target = "_blank" aria-label = "在 GitHub 上编辑此页" > <!-- [ --> <!-- ] --> < span > 在 GitHub 上编辑此页< / span > < span > < svg class = "external-link-icon" xmlns = "http://www.w3.org/2000/svg" aria-hidden = "true" focusable = "false" x = "0px" y = "0px" viewbox = "0 0 100 100" width = "15" height = "15" > < path fill = "currentColor" d = "M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z" > < / path > < polygon fill = "currentColor" points = "45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9" > < / polygon > < / svg > < span class = "external-link-icon-sr-only" > 在新窗口打开< / span > < / span > <!-- [ --> <!-- ] --> < / a > < / div > < div class = "meta-item last-updated" > < span class = "meta-item-label" > Last Updated: < / span > <!-- --> < / div > < div class = "meta-item contributors" > < span class = "meta-item-label" > 贡献者: < / span > < span class = "meta-item-info" > <!-- [ --> <!-- [ --> < span class = "contributor" title = "email: wenchenghuang@mail.bnu.edu.cn" > Winson Huang< / span > <!-- [ --> , <!-- ] --> <!-- ] --> <!-- [ --> < span class = "contributor" title = "email: hengyunabc@gmail.com" > hengyunabc< / span > <!-- [ --> , <!-- ] --> <!-- ] --> <!-- [ --> < span class = "contributor" title = "email: hengyunabc@users.noreply.github.com" > hengyunabc< / span > <!-- [ --> , <!-- ] --> <!-- ] --> <!-- [ --> < span class = "contributor" title = "email: 68638598+Allan-QLB@users.noreply.github.com" > Allan-QLB< / span > <!-- [ --> , <!-- ] --> <!-- ] --> <!-- [ --> < span class = "contributor" title = "email: i@fatpandac.com" > Fatpandac< / span > <!-- [ --> , <!-- ] --> <!-- ] --> <!-- [ --> < span class = "contributor" title = "email: 983433479@qq.com" > 汪吉< / span > <!-- [ --> , <!-- ] --> <!-- ] --> <!-- [ --> < span class = "contributor" title = "email: hollowman186@vip.qq.com" > Hollow Man< / span > <!-- --> <!-- ] --> <!-- ] --> < / span > < / div > < / footer > < nav class = "page-nav right-menu-padding" data-v-fdd717e0 > < p class = "inner" > < span class = "prev" > < a href = "/doc/perfcounter.html" class = "" aria-label = "perfcounter" > <!-- [ --> <!-- ] --> perfcounter <!-- [ --> <!-- ] --> < / a > < / span > < span class = "next" > < a href = "/doc/pwd.html" class = "" aria-label = "pwd" > <!-- [ --> <!-- ] --> pwd <!-- [ --> <!-- ] --> < / a > < / span > < / p > < / nav > <!-- [ --> <!-- ] --> < / main > <!-- ] --> < / div > <!-- --> <!-- ] --> < / div >
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