From: Dave Cramer <pg@fastcrypt.com>
To: Merlin Moncure <mmoncure@gmail.com>
Cc: Joshua D. Drake <jd@commandprompt.com>
Cc: Guillaume Cottenceau <gc@mnc.ch>
Cc: pgsql-performance@postgresql.org
Subject: Re: increasing shared buffers: how much should be removed
Date: Tue, 5 Sep 2006 14:12:46 -0400
Message-ID: <B911FAAF-EC82-41B3-B6FD-7C3D06C9061F@fastcrypt.com> (raw)
In-Reply-To: <b42b73150609050631o71806eer6a2467e2355ddcea@mail.gmail.com>
References: <87veo7a5dn.fsf@meuh.mnc.lan>
<b42b73150609011249p612ccd27gbb5ee4db9b5b10f4@mail.gmail.com>
<E3AD303F-06FE-4034-A176-3F532720A386@fastcrypt.com>
<44F8CF32.9040606@commandprompt.com>
<b42b73150609050631o71806eer6a2467e2355ddcea@mail.gmail.com>
On 5-Sep-06, at 9:31 AM, Merlin Moncure wrote:
> On 9/1/06, Joshua D. Drake <jd@commandprompt.com> wrote:
>> >>
>> >> I think 'shared buffers' is one of the most overrated settings
>> from a
>> >> performance standpoint. however you must ensure there is
>> enough for
>> >> things the server does besides caching. It used to be a bigger
>> deal
>> >> than it is in modern versionf of postgresql modern operating
>> systems.
>>
>> Previous to 8.1 I would agree with you, but as of 8.1 it is
>> probably the
>> most underrated.
>
> really? what are the relative advantages of raising shared buffers? I
> was thinking maybe there might be less context switches in high load
> environments...I'm really curious what you have to say here.
Have you tried it ? The results are quite dramatic.
So if shared buffers aren't the first tool you reach for, what is ?
>
> merlin
>
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To: pgsql-performance@postgresql.org
Cc: pg@fastcrypt.com, mmoncure@gmail.com, jd@commandprompt.com, gc@mnc.ch
Subject: Re: increasing shared buffers: how much should be removed
In-Reply-To: <B911FAAF-EC82-41B3-B6FD-7C3D06C9061F@fastcrypt.com>
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