From: Tom Lane <tgl@sss.pgh.pa.us>
To: Gavin Hamill <gdh@laterooms.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: pg 8.1.3, AIX, huge box, painfully slow.
Date: Fri, 07 Apr 2006 17:56:49 -0400
Message-ID: <17055.1144447009@sss.pgh.pa.us> (raw)
In-Reply-To: <20060407223635.9c4a0b38.gdh@laterooms.com>
References: <20060407185823.abe93017.gdh@laterooms.com>
<1144436060.32269.13.camel@state.g2switchworks.com>
<20060407205919.a091da26.gdh@laterooms.com>
<15772.1144440362@sss.pgh.pa.us>
<20060407223635.9c4a0b38.gdh@laterooms.com>
Gavin Hamill <gdh@laterooms.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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To: pgsql-performance@postgresql.org
Cc: tgl@sss.pgh.pa.us, gdh@laterooms.com
Subject: Re: pg 8.1.3, AIX, huge box, painfully slow.
In-Reply-To: <17055.1144447009@sss.pgh.pa.us>
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