Re: Tons of free RAM. Can't make it go away.

From: Claudio Freire <klaussfreire(at)gmail(dot)com>
To: sthomas(at)optionshouse(dot)com
Cc: "pgsql-performance(at)postgresql(dot)org" <pgsql-performance(at)postgresql(dot)org>
Subject: Re: Tons of free RAM. Can't make it go away.
Date: 2012-10-22 17:53:32
Message-ID: CAGTBQpZt76_VwcSAXUSZWRu9c=E4V4mgVA9Y8a-d0cY+ycaYfQ@mail.gmail.com
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On Mon, Oct 22, 2012 at 2:49 PM, Shaun Thomas <sthomas(at)optionshouse(dot)com> wrote:
>> Maybe there's just nothing to put inside?
>> How big is your database? How much of it gets accessed?
>
>
> Trust me, there's plenty. We have a DB that's 6x larger than RAM that's
> currently experiencing 6000TPS, and according to iostat, anywhere from
> 20-60% disk utilization that's mostly reads.
>
> It's pretty aggressively keeping that 14GB free, and it's driving me nuts.
> :)

Did you check the kernel's zone_reclaim_mode ?

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