From: Luke Lonergan <llonergan@greenplum.com>
To: Greg Stark <gsstark@mit.edu>
To: Joshua Marsh <icub3d@gmail.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Hardware/OS recommendations for large databases (
Date: Thu, 17 Nov 2005 22:07:54 -0800
Message-ID: <BFA2AFBA.13FC4%llonergan@greenplum.com> (raw)
In-Reply-To: <87zmo2pmas.fsf@stark.xeocode.com>
Greg,
On 11/17/05 9:17 PM, "Greg Stark" <gsstark@mit.edu> wrote:
> Ok, a more productive point: it's not really the size of the database that
> controls whether you're I/O bound or CPU bound. It's the available I/O
> bandwidth versus your CPU speed.
Postgres + Any x86 CPU from 2.4GHz up to Opteron 280 is CPU bound after
110MB/s of I/O. This is true of Postgres 7.4, 8.0 and 8.1.
A $1,000 system with one CPU and two SATA disks in a software RAID0 will
perform exactly the same as a $80,000 system with 8 dual core CPUs and the
world's best SCSI RAID hardware on a large database for decision support
(what the poster asked about).
Regards,
- Luke
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To: pgsql-performance@postgresql.org
Cc: llonergan@greenplum.com, gsstark@mit.edu, icub3d@gmail.com
Subject: Re: Hardware/OS recommendations for large databases (
In-Reply-To: <BFA2AFBA.13FC4%llonergan@greenplum.com>
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