From help-request at octave dot org Mon Jan  9 21:35:13 2006
Subject: Re: x86 vs x86_64
From: Andy Adler <adler at site dot uOttawa dot ca>
To: "Dmitri A. Sergatskov" <dasergatskov at gmail dot com>
cc: Octave Help <help at octave dot org>
Date: Mon, 9 Jan 2006 22:32:24 -0500 (EST)

On Mon, 9 Jan 2006, Dmitri A. Sergatskov wrote:

> I have an Athlon64 computer which has both 32 and 64- bit of FedoraCore4
> distributions installed. I run some benchmarks, and while 64-bit
> usually outperform
> 32-bit by 5 to 15 % , the a^1000 benchmark runs more than 50% slower.
> E.g for 3000x3000 random matrix:
> 64-bit -- 2.133 seconds, 32-bit -- 1.309 seconds.
>
> Is there some obvious reason for that? Or we just assume that this is
> a quirk (due to an immaturity) of 64-bit compiler?

Could you give some more details on octave
 - what version?
 - does it use ATLAS?
 - do you know what compiler?

--
Andy Adler <adler at site dot uOttawa dot ca> 1(613)562-5800x6218



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