可以监控指定进程的文件IO操作：pt-ioprofile

y37f 10年前

pt-ioprofile，可以监控指定进程的文件IO操作，统计出读写文件的次数、大小和耗时。当使用iotop发现某进程有超出预期的大量IO操作，可以用这个脚本定位具体访问的文件。

Usage 

pt-ioprofile [OPTIONS] [FILE]
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pt-ioprofile does two things: 1) get lsof+strace for -s seconds, 2) aggregate the result. If you specify a FILE, then step 1) is not performed.

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RISKS

WARNING: pt-ioprofile freezes the server and may crash the process, or make it perform badly after detaching, or leave it in a sleeping state! Before using this tool, please:

  • Read the tool’s documentation
  • Review the tool’s known “BUGS”
  • Test the tool on a non-production server
  • Backup your production server and verify the backups
pt-ioprofile should be considered an intrusive tool, and should not be used on production servers unless you understand and accept the risks.
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DESCRIPTION

pt-ioprofile usesstraceandlsofto watch a process’s IO and print out a table of files and I/O activity. By default, it watches the mysqld process for 30 seconds. The output is like: 

Tue Dec 27 15:33:57 PST 2011  Tracing process ID 1833       total read write      lseek  ftruncate filename    0.000150   0.000029   0.000068   0.000038   0.000015 /tmp/ibBE5opS
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项目主页：http://www.open-open.com/lib/view/home/1426412292646

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