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Re: Advice sought : new database server

From: Jeff Janes <jeff(dot)janes(at)gmail(dot)com>
To: Ants Aasma <ants(dot)aasma(at)eesti(dot)ee>
Cc: Merlin Moncure <mmoncure(at)gmail(dot)com>, Craig James <cjames(at)emolecules(dot)com>, Rory Campbell-Lange <rory(at)campbell-lange(dot)net>, Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com>, pgsql-performance(at)postgresql(dot)org
Subject: Re: Advice sought : new database server
Date: 2012-03-08 16:03:42
Message-ID: CAMkU=1wu-FNJaz6=cec47D9Y7P5OYXFb_fxX1BuLz_AMbJ-Pyg@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-performance
On Thu, Mar 8, 2012 at 4:43 AM, Ants Aasma <ants(dot)aasma(at)eesti(dot)ee> wrote:
> On Wed, Mar 7, 2012 at 10:18 PM, Merlin Moncure <mmoncure(at)gmail(dot)com> wrote:
>> those numbers are stupendous for 8 drive sata.  how much shared
>> buffers do you have?
>
> Couple of things to notice:
> 1) The benchmark can run fully in memory, although not 100% in shared_buffers.
> 2) These are 100k transaction runs, meaning that probably no
> checkpointing was going on.
> 3) Given the amount of memory in the server, with  dirty flush
> settings the OS will do mostly sequential writes.
>
> Just ran a quick test. With synchronous_commit=off to simulate a BBU I
> have no trouble hitting 11k tps on a single SATA disk.

fsync=off might be a better way to simulate a BBU.

Cheers,

Jeff

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