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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Guillaume Smet <guillaume.smet@gmail.com>
Cc: Sven Geisler <sgeisler@aeccom.com>
Cc: Richard Huxton <dev@archonet.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: PostgreSQL and Xeon MP
Date: Thu, 16 Mar 2006 11:34:58 -0500
Message-ID: <17483.1142526898@sss.pgh.pa.us> (raw)
In-Reply-To: <1d4e0c10603160808y6c2f683csb74086b10c3cd40e@mail.gmail.com>
References: <1d4e0c10603160245n55128e86t35431a339afcf8cc@mail.gmail.com>
	<44194A4B.3020106@archonet.com>
	<1d4e0c10603160428s1a3c1f4cocbe8489634524387@mail.gmail.com>
	<441963F4.1010607@aeccom.com>
	<1d4e0c10603160630g7fe945ffo1d723843407ed128@mail.gmail.com>
	<16633.1142522409@sss.pgh.pa.us>
	<1d4e0c10603160808y6c2f683csb74086b10c3cd40e@mail.gmail.com>

"Guillaume Smet" <guillaume.smet@gmail.com> writes:
> You mean strace -p pid with pid on some of the postgres process not on
> the postmaster itself, does you?

Right, pick a couple that are accumulating CPU time.

> Do we need other options?

strace will generate a *whole lot* of output to stderr.  I usually do
something like
	strace -p pid 2>outfile
and then control-C it after a few seconds.

> Which pattern should we expect?

What we want to find out is if there's a lot of select()s and/or
semop()s shown in the result.  Ideally there wouldn't be any, but
I fear that's not what you'll find.

			regards, tom lane

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