From: Ulrich <ulrich.mierendorff@gmx.net>
To: Scott Marlowe <scott.marlowe@gmail.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: More shared_buffers instead of effective_cache_size?
Date: Thu, 04 Sep 2008 22:01:33 +0200
Message-ID: <48C03E9D.60508@gmx.net> (raw)
In-Reply-To: <dcc563d10809041249w5ff1ed59pd8964da5e3d605e7@mail.gmail.com>
References: <48C035E2.3070407@gmx.net>
<dcc563d10809041230h751129c4o93d68c083b8c72e9@mail.gmail.com>
<48C0395C.4000806@gmx.net>
<dcc563d10809041249w5ff1ed59pd8964da5e3d605e7@mail.gmail.com>
Scott Marlowe wrote:
> On Thu, Sep 4, 2008 at 1:39 PM, Ulrich <ulrich.mierendorff@gmx.net> wrote:
>
>>> I wouldn't set shared_buffers that high
>>> just because things like vacuum and sorts need memory too
>>>
>> Okay, I understand that vacuum uses memory, but I thought sorts are done in
>> work_mem? I am only sorting the result of one query which will never return
>> more than 500 rows.
>>
>
> You can probably play with larger shared memory, but I'm betting that
> the fact that you're running under a VM is gonna weigh eveything down
> a great deal, to the point that you're tuning is going to have minimal
> effect.
>
Hmm... Why do you think so? Is there a reason for it or do other people
have problems with virtual servers and databases?
I have reserved cpu power and reserved ram (okay, not much, but it is
reserved ;-) ), the only thing I dont have is reserved file-cache.
-Ulrich
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To: pgsql-performance@postgresql.org
Cc: ulrich.mierendorff@gmx.net, scott.marlowe@gmail.com
Subject: Re: More shared_buffers instead of effective_cache_size?
In-Reply-To: <48C03E9D.60508@gmx.net>
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