| From: | Merlin Moncure <mmoncure(at)gmail(dot)com> |
|---|---|
| To: | Kevin Goess <kgoess(at)bepress(dot)com> |
| Cc: | "pgsql-general(at)postgresql(dot)org" <pgsql-general(at)postgresql(dot)org> |
| Subject: | Re: free RAM not being used for page cache |
| Date: | 2014-07-30 18:49:32 |
| Message-ID: | CAHyXU0wPjYkmOt-CJCC=Kk4aPS9S=agmed2dZYsopUp4OuwDJA@mail.gmail.com |
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| Lists: | pgsql-general |
On Wed, Jul 30, 2014 at 12:51 PM, Kevin Goess <kgoess(at)bepress(dot)com> wrote:
> A couple months ago we upgraded the RAM on our database servers from 48GB to
> 64GB. Immediately afterwards the new RAM was being used for page cache,
> which is what we want, but that seems to have dropped off over time, and
> there's currently actually like 12GB of totally unused RAM.
>
> http://s76.photobucket.com/user/kgoesspb/media/db1-mem-historical.png.html
>
> Is that expected? Is there a setting we need to tune for that? We have
> 400GB of databases on this box, so I know it's not all fitting in that
> 49.89GB.
could be a numa issue. Take a look at:
http://frosty-postgres.blogspot.com/2012/08/postgresql-numa-and-zone-reclaim-mode.html
merlin
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