Re: PostgreSQL 9.3 abd CentOS 7 memory usage

From: Jeff Frost <jeff(at)pgexperts(dot)com>
To: Elías David <elias(dot)moreno(dot)tec(at)gmail(dot)com>
Cc: pgsql-admin <pgsql-admin(at)postgresql(dot)org>
Subject: Re: PostgreSQL 9.3 abd CentOS 7 memory usage
Date: 2014-10-12 17:56:10
Message-ID: DC19871B-9A9D-474C-8C7F-87521D2579FB@pgexperts.com
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On Oct 12, 2014, at 10:33 AM, Elías David <elias(dot)moreno(dot)tec(at)gmail(dot)com> wrote:

> I know that shared memory usage in postgres was changed on 9.3 from sys v to posix so changing things like shmmax and the like aren't needed anymore (although we've trying changing those to no effect)
>
> We've even seen out of memory errors on postgres logs a few times when the server is just using something like 8GB out of 128GB of ram
>
> Has anyone experienced a similar issue or have seen weird memory usage patrons with CentOS 7?
>

Any chance zone reclaim mode is enabled?

cat /proc/sys/vm/zone_reclaim_mode

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