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From: Craig Ringer <craig@postnewspapers.com.au>
To: Aren Cambre <aren@arencambre.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Postgres refusing to use >1 core
Date: Wed, 11 May 2011 09:35:01 +0800
Message-ID: <4DC9E7C5.9080309@postnewspapers.com.au> (raw)
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On 11/05/11 05:34, Aren Cambre wrote:

> Using one thread, the app can do about 111 rows per second, and it's
> only exercising 1.5 of 8 CPU cores while doing this. 12,000,000 rows /
> 111 rows per second ~= 30 hours.

I don't know how I missed that. You ARE maxing out one cpu core, so
you're quite right that you need more threads unless you can make your
single worker more efficient.

Why not just spawn more copies of your program and have them work on
ranges of the data, though? Might that not be simpler than juggling
threading schemes?

--
Craig Ringer

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