工具

https://github.com/alibaba/arthas

集成支持采集火焰图
https://github.com/alibaba/arthas/issues/951

  1. ## 启动命令
  2. java -jar arthas-boot.jar
  4. [root@dapr1 bin]# java -jar ../tmp/arthas-boot.jar
  5. [INFO] arthas-boot version: 3.5.1
  6. [INFO] Process 245797 already using port 3658
  7. [INFO] Process 245797 already using port 8563
  8. [INFO] Found existing java process, please choose one and input the serial number of the process, eg : 1. Then hit ENTER.
  9. * [1]: 245797 /export/App/web-launcher.jar
  10. 1
  11. [INFO] arthas home: /export/App/tmp
  12. [INFO] The target process already listen port 3658, skip attach.
  13. [INFO] arthas-client connect 127.0.0.1 3658
  14.   ,---.  ,------. ,--------.,--.  ,--.  ,---.   ,---.                          
  15.  /  O  \ |  .--. ''--.  .--'|  '--'  | /  O  \ '   .-'                         
  16. |  .-.  ||  '--'.'   |  |   |  .--.  ||  .-.  |`.  `-.                         
  17. |  | |  ||  |\  \    |  |   |  |  |  ||  | |  |.-'    |                        
  18. `--' `--'`--' '--'   `--'   `--'  `--'`--' `--'`-----'                         
  21. wiki       https://arthas.aliyun.com/doc                                       
  22. tutorials  https://arthas.aliyun.com/doc/arthas-tutorials.html                 
  23. version    3.5.1                                                               
  24. main_class                                                                     
  25. pid        245797                                                              
  26. time       2021-06-09 07:16:01                                                 
  28. [arthas@245797]$ profiler start         ##开始采集profiler, 默认只采集cpu ，可以通过 参数修改 -e, --event <value>，(cpu, alloc, lock, cache-misses etc.)
  29. Started [cpu] profiling
  30. [arthas@245797]$ profiler status        ##查看状态
  31. [perf] profiling is running for 2 seconds
  32. [arthas@245797]$ profiler status
  33. [perf] profiling is running for 3 seconds
  34. [arthas@245797]$ profiler status
  35. [perf] profiling is running for 4 seconds
  36. [arthas@245797]$ profiler status
  37. [perf] profiling is running for 5 seconds
  38. [arthas@245797]$ profiler stop          ##停止采集profiler
  39. OK
  40. profiler output file: /export/App/bin/arthas-output/20210609-072454.svg         ##生成的火焰图
  42. 通过浏览器查看arthas-output下面的profiler结果
  43. 默认情况下，arthas使用3658端口，则可以打开： http://localhost:3658/arthas-output/ 查看到arthas-output目录下面的profiler结果

profiler命令参数

  1. [arthas@245797]$ profiler --help
  2.  USAGE:                                                                                                                                                                                                                    
  3.    profiler [--allkernel] [--alluser] [-d <value>] [-e <value>] [--exclude <value>] [-f <value>] [--format <value>] [-b <value>] [-h] [--include <value>] [-i <value>] [--threads] action [actionArg]                      
  5.  SUMMARY:                                                                                                                                                                                                                  
  6.    Async Profiler. https://github.com/jvm-profiling-tools/async-profiler                                                                                                                                                   
  8.  EXAMPLES:                                                                                                                                                                                                                 
  9.    profiler start                                                                                                                                                                                                          
  10.    profiler stop                                                                                                                                                                                                           
  11.    profiler list                # list all supported events                                                                                                                                                                
  12.    profiler actions             # list all supported actions                                                                                                                                                               
  13.    profiler start --event alloc                                                                                                                                                                                            
  14.    profiler stop --format svg   # output file format, support svg,html,jfr                                                                                                                                                 
  15.    profiler stop --file /tmp/result.html                                                                                                                                                                                   
  16.    profiler stop --threads                                                                                                                                                                                                 
  17.    profiler start --include 'java/*' --include 'demo/*' --exclude '*Unsafe.park*'                                                                                                                                          
  18.    profiler status                                                                                                                                                                                                         
  19.    profiler resume              # Start or resume profiling without resetting collected data.                                                                                                                              
  20.    profiler getSamples          # Get the number of samples collected during the profiling session                                                                                                                         
  21.    profiler dumpFlat            # Dump flat profile, i.e. the histogram of the hottest methods                                                                                                                             
  22.    profiler dumpCollapsed       # Dump profile in 'collapsed stacktraces' format                                                                                                                                           
  23.    profiler dumpTraces          # Dump collected stack traces                                                                                                                                                              
  24.    profiler execute 'start,framebuf=5000000'      # Execute an agent-compatible profiling command                                                                                                                          
  25.    profiler execute 'stop,file=/tmp/result.svg'   # Execute an agent-compatible profiling command                                                                                                                          
  27.  WIKI:                                                                                                                                                                                                                     
  28.    https://arthas.aliyun.com/doc/profiler                                                                                                                                                                                  
  30.  OPTIONS:                                                                                                                                                                                                                  
  31.      --allkernel                                                          include only kernel-mode events                                                                                                                  
  32.      --alluser                                                            include only user-mode events                                                                                                                    
  33.  -d, --duration <value>                                                   run profiling for <duration> seconds                                                                                                             
  34.  -e, --event <value>                                                      which event to trace (cpu, alloc, lock, cache-misses etc.), default value is cpu                                                                 
  35.      --exclude <value>                                                    exclude stack traces containing PATTERN, for example: '*Unsafe.park*'                                                                            
  36.  -f, --file <value>                                                       dump output to <filename>                                                                                                                        
  37.      --format <value>                                                     dump output file format(svg, html, jfr), default valut is svg                                                                                    
  38.  -b, --framebuf <value>                                                   size of the buffer for stack frames (default: 1'000'000)                                                                                         
  39.  -h, --help                                                               this help                                                                                                                                        
  40.      --include <value>                                                    include stack traces containing PATTERN, for example: 'java/*'                                                                                   
  41.  -i, --interval <value>                                                   sampling interval in ns (default: 10'000'000, i.e. 10 ms)                                                                                        
  42.      --threads                                                            profile different threads separately                                                                                                             
  43.  <action>                                                                 Action to execute                                                                                                                                
  44.  <actionArg>                                                              Attribute name pattern.

命令行工具

https://github.com/jvm-profiling-tools/async-profiler
https://github.com/brendangregg/FlameGraph

生成火焰图

  1. 进入async-profiler那个项目的目录
  3. ./profiler.sh -d 60 -o collapsed -f /tmp/test_01.txt ${pid}
  5. -d表示的是持续时长，后面60代表持续采集时间60s，-o表示的是采集规范，这里用的是collapsed，-f后面的路径，表示的是数据采集后生成的数据存放的文件路径（这里放在了/tmp/test_01.txt），${pid}表示的是采集目标进程的pid

生成svg

  1. perl flamegraph.pl --colors=java /tmp/test_01.txt > test_01.svg
  3. 因为是perl文件，这里使用perl指令运行该文件，后面--colors表示着色风格，这里是java，后面的是数据文件的路径，这里是刚刚上面生成的那个文件/tmp/test_01.txt，最后的test_01.svg就是最终生成的火焰图文件存放的路径和文件命名，这里是命名为test_01.svg并保存在当前路径，运行后看到该文件已经存在于当前目录下
  6. 生成文件后，下载，使用浏览器打开