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Re: buffer assertion tripping under repeat pgbench load

From: Bruce Momjian <bruce(at)momjian(dot)us>
To: Greg Smith <greg(at)2ndQuadrant(dot)com>
Cc: Greg Stark <stark(at)mit(dot)edu>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>,Simon Riggs <simon(at)2ndquadrant(dot)com>,Andres Freund <andres(at)2ndquadrant(dot)com>,PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: buffer assertion tripping under repeat pgbench load
Date: 2013-01-15 19:11:23
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Lists: pgsql-hackers
On Sun, Jan 13, 2013 at 12:34:07AM -0500, Greg Smith wrote:
> On 12/26/12 7:23 PM, Greg Stark wrote:
> >It's also possible it's a bad cpu, not bad memory. If it affects
> >decrement or increment in particular it's possible that the pattern of
> >usage on LocalRefCount is particularly prone to triggering it.
> This looks to be the winning answer.  It turns out that under
> extended multi-hour loads at high concurrency, something related to
> CPU overheating was occasionally flipping a bit.  One round of
> compressed air for all the fans/vents, a little tweaking of the fan
> controls, and now the system goes >24 hours with no problems.

Odd your system didn't report the problem to you.

  Bruce Momjian  <bruce(at)momjian(dot)us>

  + It's impossible for everything to be true. +

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