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Re: Linux mis-reporting memory

From: Gregory Stark <stark(at)enterprisedb(dot)com>
To: "Csaba Nagy" <nagy(at)ecircle-ag(dot)com>
Cc: "Decibel!" <decibel(at)decibel(dot)org>, <pgsql-performance(at)postgresql(dot)org>
Subject: Re: Linux mis-reporting memory
Date: 2007-09-21 09:43:07
Message-ID: 87r6ksuzf8.fsf@oxford.xeocode.com (view raw or flat)
Thread:
Lists: pgsql-performance
"Csaba Nagy" <nagy(at)ecircle-ag(dot)com> writes:

> On Fri, 2007-09-21 at 09:03 +0100, Gregory Stark wrote:
>> >> Mem:  32945280k total, 32871832k used,    73448k free,   247432k buffers
>> >> Swap:  1951888k total,    42308k used,  1909580k free, 30294300k cached
>> >
>> It seems to imply Linux is paging out sysV shared memory. In fact some of
>> Heikki's tests here showed that Linux would do precisely that.
>
> But then why is it not reporting that in the "Swap: used" section ? It
> only reports 42308k used swap. 

Hm, good point.

The other possibility is that Postgres just hasn't even touched a large part
of its shared buffers. 

-- 
  Gregory Stark
  EnterpriseDB          http://www.enterprisedb.com

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