Profiling under Linux

From: Jan Wieck <janwieck(at)yahoo(dot)com>
To: PostgreSQL HACKERS <pgsql-hackers(at)postgreSQL(dot)org>
Subject: Profiling under Linux
Date: 2001-12-06 15:04:30
Message-ID: 200112061504.fB6F4Vd02648@saturn.jw.home
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Hi,

I had the same problem with gprof(1) that all the timing
information is zero. Today I found out what's going on.

Under Linux fork(2) resets the ITIMER_PROF. Getting the
itimer before the fork(2) with getitimer(2) and if pid==0
setting it with setitimer(2) to what it was makes profiling
work.

Jan

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