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Subject: Re: Speedups for BitBoard programs on 64-bit machines

Author: Gian-Carlo Pascutto

Date: 13:28:39 06/04/02

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On June 04, 2002 at 16:18:55, Gian-Carlo Pascutto wrote:

>Because you are using a processor that is clocked at twice the clock
>frequency?  Why compare a 1ghz processor to a (nearly) 2ghz processor
>and conclude anything about efficiency there?  Is there anything that
>suggests that the alpha is simply more "efficient"?  To justify that
>clock frequency disparity?
>
>A machine twice as fast (clock freq) _should_ perform just as well as
>a 64 bit machine at 1/2 the frequency...  Less would suggest that the
>32 bit machine simply sucks badly.

I don't agree with the validity of a clock-for-clock comparison,
but if you want to do it anyway, I'll again point to Vincent's
numbers:

At the same clockspeed, Crafty only gets 33% faster on the 64-bits
machine.

When you read this, keep in mind that most applications get _more_
than 33% faster on the 64-bits machine.

--
GCP



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