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Re: x86 vs x86_64

From: Andy Adler
Subject: Re: x86 vs x86_64
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 <address@hidden> 1(613)562-5800x6218

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