之前说过用idea自带的工具生成火焰图，但是idea是在本地的，在机器上如何生成呢？
我觉得方法有很多，这里用arthas工具简单搞一搞
Arthas官网地址
下载Arthas
如果在机器上要下载整个包，arthas-boot.jar需要依赖其他的jar包
操作
进入到jvm进程中
~/software/arthas/ java -jar arthas-boot.jar
[INFO] JAVA_HOME: /Library/Java/JavaVirtualMachines/zulu-8.jdk/Contents/Home/jre
[INFO] arthas-boot version: 3.6.9
[INFO] Found existing java process, please choose one and input the serial number of the process, eg : 1. Then hit ENTER.
* [1]: 2033
[2]: 2070 org.jetbrains.idea.maven.server.RemoteMavenServer36
[3]: 2118 math-game.jar
[4]: 2072 org.jetbrains.jps.cmdline.Launcher
3
[INFO] Try to attach process 2118
Picked up JAVA_TOOL_OPTIONS:
[INFO] Attach process 2118 success.
[INFO] arthas-client connect 127.0.0.1 3658
,---. ,------. ,--------.,--. ,--. ,---. ,---.
/ O \ | .--. ''--. .--'| '--' | / O \ ' .-'
| .-. || '--'.' | | | .--. || .-. |`. `-.
| | | || |\ \ | | | | | || | | |.-' |
`--' `--'`--' '--' `--' `--' `--'`--' `--'`-----'
wiki https://arthas.aliyun.com/doc
tutorials https://arthas.aliyun.com/doc/arthas-tutorials.html
version 3.6.9
main_class demo.MathGame
pid 2118
time 2023-07-15 12:55:44
[arthas@2118]$
开始采集
[arthas@2118]$ profiler start
Profiling started
[arthas@2118]$
[arthas@2118]$
[arthas@2118]$ profiler getSamples
22
[arthas@2118]$
[arthas@2118]$ profiler status
Profiling is running for 52 seconds
[arthas@2118]$
[arthas@2118]$ profiler stop --format html
OK
profiler output file: /Users/lixi/software/arthas/arthas-output/20230715-125705.html
[arthas@2118]$
[arthas@2118]$
查看
open /Users/lixi/software/arthas/arthas-output/20230715-125705.html
选择 main 方法
总结
方法很简单，主要用到的命令
profiler start
profiler status
profiler stop --format html
