Following today call, here are two tools I use when profiling.

# Sysprof

A system wide profiler.

http://www.daimi.au.dk/~sandmann/sysprof/

To install on Ubuntu:

aptitude install sysprof-module-source sysprof
m-a a-i sysprof-module


# Callgrind

A profiler tool for valgrind.

http://valgrind.org/info/tools.html#callgrind

Nice description of usage here, including the use of callgrind_control:
http://blog.bepointbe.be/index.php/2008/10/19/30-a-bit-of-plasma-profiling

Aurélien

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