From: Christopher Browne <cbbrowne@acm.org>
Subject: Re: 64-bit vs 32-bit performance ... backwards?
Date: Tue, 13 Jun 2006 08:23:42 -0400
Organization: cbbrowne Computing Inc
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To: pgsql-performance@postgresql.org

Martha Stewart called it a Good Thing when nis@superlativ.dk (Nis Jorgensen) wrote:
> J. Andrew Rogers wrote:
>
>> We have been using PostgreSQL on Opteron servers almost since the
>> Opteron was first released, running both 32-bit and 64-bit versions of
>> Linux.  Both 32-bit and 64-bit versions have been bulletproof for us,
>> with the usual stability I've become accustomed to with both PostgreSQL
>> and Linux.  We have been running nothing but 64-bit versions on
>> mission-critical systems for the last year with zero problems.
>> 
>> The short story is that for us 64-bit PostgreSQL on Opterons is
>> typically something like 20% faster than 32-bit on the same, and *much*
>> faster than P4 Xeon systems they nominally compete with. 
>
> Since you sound like you have done extensive testing:
>
> Do you have any data regarding whether to enable hyperthreading or not?
> I realize that this may be highly dependant on the OS, application and
> number of CPUs, but I would be interested in hearing your
> recommendations (or others').

Um, Hyper-Threading?  On AMD?

Hyper-Threading is a feature only offered by Intel, on some Pentium 4
chips.

It is not offered by AMD.  For our purposes, this is no loss; database
benchmarks have widely shown it to be a performance loser across
various database systems.
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