From: Josh Berkus <josh@agliodbs.com>
To: pgsql-performance@postgresql.org
Subject: Re: Hyperthreading (was: Two identical systems, radically different performance)
Date: Tue, 09 Oct 2012 13:56:59 -0700
Message-ID: <50748F9B.10008@agliodbs.com> (raw)
In-Reply-To: <CAFwQ8revW5Ez6uCUqPeUFVHh0pdy0OZKv8_nM0SvxHgTM055EQ@mail.gmail.com>
References: <CAFwQ8revW5Ez6uCUqPeUFVHh0pdy0OZKv8_nM0SvxHgTM055EQ@mail.gmail.com>
On 10/9/12 1:12 PM, Craig James wrote:
> I've confirmed that hyperthreading causes a huge drop in performance on a
> 2x4-core Intel Xeon E5620 2.40GHz system. The bottom line is:
>
> ~3200 TPS max with hyperthreading
> ~9000 TPS max without hyprethreading
Oh, interesting! This is the first time I've seen results like this on
a later Linux kernel and processor. I thought Intel had licked the
"hyperthreading penalty".
--
Josh Berkus
PostgreSQL Experts Inc.
http://pgexperts.com
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To: pgsql-performance@postgresql.org
Cc: josh@agliodbs.com
Subject: Re: Hyperthreading (was: Two identical systems, radically different performance)
In-Reply-To: <50748F9B.10008@agliodbs.com>
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