From: Joshua Berkus <josh@agliodbs.com>
To: Dave Crooke <dcrooke@gmail.com>
Cc: postgres performance list <pgsql-performance@postgresql.org>
Subject: Re: Linux machine aggressively clearing cache
Date: Wed, 28 Mar 2012 13:37:38 -0500 (CDT)
Message-ID: <807948699.229132.1332959858793.JavaMail.root@mail-1.01.com> (raw)
In-Reply-To: <CALi4UpjQSQ3FeShXsLRkG8p5cyuRpJLzy7_hmLr0DRsZ_qVK+A@mail.gmail.com>
> This may just be a typo, but if you really did create write (dirty)
> block device cache by writing the pg_dump file somewhere, then that
> is what it's supposed to do ;)
The pgdump was across the network. So the only caching on the machine was read caching.
> Read cache of course does not need to be flushed and can simply be
> dumped when the memory is needed, and so Linux will keep more or
> less unlimited amounts of read cache until it needs the memory for
> something else ....
Right, that's the normal behavior. Except not on this machine.
--Josh
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To: pgsql-performance@postgresql.org
Cc: josh@agliodbs.com, dcrooke@gmail.com
Subject: Re: Linux machine aggressively clearing cache
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