Re: pg 8.1.3, AIX, huge box, painfully slow.

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Gavin Hamill <gdh(at)laterooms(dot)com>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: pg 8.1.3, AIX, huge box, painfully slow.
Date: 2006-04-07 21:56:49
Message-ID: 17055.1144447009@sss.pgh.pa.us
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Gavin Hamill <gdh(at)laterooms(dot)com> writes:
> There's truss installed which seems to do the same as strace on
> Linux... and here's a wildly non-scientific glance.. I watched the
> 'topas' output (top for AIX) , identified a PID that was doing a lot of
> work, then attached truss to that pid. In addition to lots of send
> (), recv() and lseek()s...

Those are good, they represent real work getting done.

> about once a minute I saw hundreds of calls
> to __semop() interspersed with _select(),

This is not good. Did the semop storms coincide with visible slowdown?
(I'd assume so, but you didn't actually say...)

regards, tom lane

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