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profiler
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===
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> 使用[async-profiler](https://github.com/jvm-profiling-tools/async-profiler)生成火焰图
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`profiler` 命令支持生成应用热点的火焰图。本质上是通过不断的采样，然后把收集到的采样结果生成火焰图。
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`profiler` 命令基本运行结构是 `profiler action [actionArg]`
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### 启动profiler
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```
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$ profiler start
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Started [cpu] profiling
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```
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> 默认情况下，生成的是cpu的火焰图，即event为`cpu`。可以用`--event`参数来指定。
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### 获取已采集的sample的数量
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```
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$ profiler getSamples
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23
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```
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### 查看profiler状态
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```bash
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$ profiler status
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[cpu] profiling is running for 4 seconds
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```
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可以查看当前profiler在采样哪种`event`和采样时间。
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### 停止profiler
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#### 生成svg格式结果
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```
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$ profiler stop
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profiler output file: /tmp/demo/arthas-output/20191125-135546.svg
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OK
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```
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默认情况下，生成的结果保存到应用的`工作目录`下的`arthas-output`目录。可以通过 `--file`参数来指定输出结果路径。比如：
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```bash
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$ profiler stop --file /tmp/output.svg
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profiler output file: /tmp/output.svg
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OK
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```
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#### 生成html格式结果
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默认情况下，结果文件是`svg`格式，如果想生成`html`格式，可以用`--format`参数指定：
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```bash
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$ profiler stop --format html
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profiler output file: /tmp/test/arthas-output/20191125-143329.html
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OK
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```
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或者在`--file`参数里用文件名指名格式。比如`--file /tmp/result.html` 。
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### 通过浏览器查看arthas-output下面的profiler结果
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默认情况下，arthas使用3658端口，则可以打开： [http://localhost:3658/arthas-output/](http://localhost:3658/arthas-output/) 查看到`arthas-output`目录下面的profiler结果：
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点击可以查看具体的结果：
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> 如果是chrome浏览器，可能需要多次刷新。
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### profiler支持的events
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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：
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```bash
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$ profiler list
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Basic events:
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cpu
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alloc
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lock
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wall
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itimer
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```
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在linux下面
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```bash
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$ profiler list
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Basic events:
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cpu
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alloc
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lock
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wall
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itimer
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Perf events:
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page-faults
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context-switches
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cycles
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instructions
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cache-references
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cache-misses
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branches
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branch-misses
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bus-cycles
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L1-dcache-load-misses
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LLC-load-misses
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dTLB-load-misses
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mem:breakpoint
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trace:tracepoint
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```
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如果遇到OS本身的权限/配置问题，然后缺少部分event，可以参考`async-profiler`本身文档：[async-profiler](https://github.com/jvm-profiling-tools/async-profiler)
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可以用`--event`参数指定要采样的事件，比如对`alloc`事件进入采样：
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```bash
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$ profiler start --event alloc
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```
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### 恢复采样
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```bash
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$ profiler resume
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Started [cpu] profiling
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```
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`start`和`resume`的区别是：`start`是新开始采样，`resume`会保留上次`stop`时的数据。
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通过执行`profiler getSamples`可以查看samples的数量来验证。
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### 使用`execute`来执行复杂的命令
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比如开始采样：
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```bash
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profiler execute 'start'
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```
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停止采样，并保存到指定文件里：
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```bash
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profiler execute 'stop,file=/tmp/result.svg'
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```
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具体的格式参考： [arguments.cpp#L34](https://github.com/jvm-profiling-tools/async-profiler/blob/v1.6/src/arguments.cpp#L34)
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### 查看所有支持的action
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```bash
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$ profiler actions
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Supported Actions: [resume, dumpCollapsed, getSamples, start, list, execute, version, stop, load, dumpFlat, actions, dumpTraces, status]
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```
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### 查看版本
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```bash
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$ profiler version
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Async-profiler 1.6 built on Sep 9 2019
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Copyright 2019 Andrei Pangin
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```
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