From: Greg Smith <gsmith@gregsmith.com>
To: Gregory Stark <stark@enterprisedb.com>
Cc: Joe Uhl <joeuhl@gmail.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: High CPU Utilization
Date: Tue, 17 Mar 2009 00:19:25 -0400 (EDT)
Message-ID: <alpine.GSO.2.01.0903170017410.5259@westnet.com> (raw)
In-Reply-To: <87d4ch0z4z.fsf@oxford.xeocode.com>
References: <8609D1C0-3ECD-4A4F-B9C6-1FC8496EDC7A@gmail.com>
<200903161252.22202@hal.medialogik.com>
<5F9840B1-D080-4F3A-81D4-57E8F1DB0955@gmail.com>
<alpine.GSO.2.01.0903161621230.3428@westnet.com>
<87d4ch0z4z.fsf@oxford.xeocode.com>
On Tue, 17 Mar 2009, Gregory Stark wrote:
> Hm, well the tests I ran for posix_fadvise were actually on a Perc5 -- though
> who knows if it was the same under the hood -- and I saw better performance
> than this. I saw about 4MB/s for a single drive and up to about 35MB/s for 15
> drives. However this was using linux md raid-0, not hardware raid.
Right, it's the hardware RAID on the Perc5 I think people mainly complain
about. If you use it in JBOD mode and let the higher performance CPU in
your main system drive the RAID functions it's not so bad.
--
* Greg Smith gsmith@gregsmith.com http://www.gregsmith.com Baltimore, MD
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To: pgsql-performance@postgresql.org
Cc: gsmith@gregsmith.com, stark@enterprisedb.com, joeuhl@gmail.com
Subject: Re: High CPU Utilization
In-Reply-To: <alpine.GSO.2.01.0903170017410.5259@westnet.com>
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