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Re: High CPU Utilization

From: Greg Smith <gsmith(at)gregsmith(dot)com>
To: Gregory Stark <stark(at)enterprisedb(dot)com>
Cc: Joe Uhl <joeuhl(at)gmail(dot)com>, pgsql-performance(at)postgresql(dot)org
Subject: Re: High CPU Utilization
Date: 2009-03-17 04:19:25
Message-ID: alpine.GSO.2.01.0903170017410.5259@westnet.com (view raw or flat)
Thread:
Lists: pgsql-performance
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(at)gregsmith(dot)com http://www.gregsmith.com Baltimore, MD

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