http://www.open-sharedroot.org/faq/troubleshooting-guide/performance-analysis-and-tuning/oprofile

oprofile

a low-overhead system-wide profiler

Resources

Mini Howto

From linux-cluster mailing list

  1. Obtain a script called "opreport_module" in Will's people page; put it into /tmp and chmod +x.
  2. opcontrol --init
  3. opcontrol --setup --vmlinux=/usr/lib/debug/lib/modules/`uname -r`/vmlinux
  4. opcontrol --start
  5. (run your ls here)
  6. opcontrol --dump
  7. opcontrol --shutdown
  8. opreport --long-filenames (pipe this output to a file and email me)
  9. /tmp/opreport_module /gfs (pipe this output to a file and email me).

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