Re: understanding postgres issues/bottlenecks

From: "Merlin Moncure" <mmoncure(at)gmail(dot)com>
To: "Stefano Nichele" <stefano(dot)nichele(at)gmail(dot)com>
Cc: "Scott Marlowe" <scott(dot)marlowe(at)gmail(dot)com>, pgsql-performance(at)postgresql(dot)org
Subject: Re: understanding postgres issues/bottlenecks
Date: 2009-01-08 12:45:48
Message-ID: b42b73150901080445s106b6818w8aba7955a319327a@mail.gmail.com
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On Thu, Jan 8, 2009 at 3:36 AM, Stefano Nichele
<stefano(dot)nichele(at)gmail(dot)com> wrote:
> Find !
>
> Dell CERC SATA RAID 2 PCI SATA 6ch
>
> Running lspci -v:
>
> 03:09.0 RAID bus controller: Adaptec AAC-RAID (rev 01)
> Subsystem: Dell CERC SATA RAID 2 PCI SATA 6ch (DellCorsair)

IIRC that's the 'perc 6ir' card...no write caching. You are getting
killed with syncs. If you can restart the database, you can test with
fsync=off comparing load to confirm this. (another way is to compare
select only vs regular transactions on pgbench).

merlin

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