Thursday 14 April 2011

OProfile

Install Oprofile you will need to kernel-debuginfo first
#yum install kernel-debuginfo-$(uname -r)

#yum install -y oprofile oprofile-gui

Add the following to rc.local when profiling
Setup Oprofile for kernel profiling
#opcontrol --setup --vmlinux=/usr/lib/debug/lib/modules/$(uname -r)/vmlinux
OR
Setup Oprofile for non kernel profiling
#opcontrol --setup  --no-vmlinux
THEN
Check available events
#opcontrol --list-events

Clear the data and start to profile
#opcontrol --reset
#opcontrol --start

#Dump the data to a file and stop the profiling
#opcontrol --dump
#opcontrol --stop

Get the information
#opreport

Get report for sepcific binary
#opreport -l /bin/bash

For the kernel use
 #opreport -l /usr/lib/debug/lib/modules/$(uname -r)/vmlinux

Run the following to unload Oprofile
#opcontrol --deinit

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