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Subject: Re: Darkthought

Author: Ernst A. Heinz

Date: 04:19:50 06/29/99

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On June 29, 1999 at 07:04:13, Vincent Diepeveen wrote:

>On June 29, 1999 at 06:45:35, Ernst A. Heinz wrote:
>
>>Talking about preparation for the WCCC, I like to tell you a little
>>secret. We were not able to do *any* special preparation because Markus
>>finishes his M.Sc. at the end of July and I focused on writing my Ph.D.
>>during the last months. The version of "DarkThought" that participated
>>in Paderborn was at least 9 month old and is essentially equivalent to
>>the one which played the test games listed on our WWW pages (see URL
>>http://wwwipd.ira.uka.de/Tichy/DarkThought/). The program was mostly
>>out of book after 4 moves or so which is actually not so bad as it may
>>sound at first glance.
>>
>>=Ernst=
>
>Hello Ernst,
>
>I heart you ran on a 21264 chip. How fast is this chip and what
>do you think of it?

We ran on a 500MHz Alpha-21264 which is about 10% faster for "DarkThought"
than the 767MHz Alpha-21164a we had in Paris. Hence, our hardware speed
hardly increased at all since the Paris WMCC while that of all PC programs
at least doubled since then.

The Alpha-21264 is a nice CPU -- and it will be even nicer as soon as
the bit-find and population-count instructions are implemented on-chip
in the next stepping of the CPU (EV67/EV68). Performance-wise, the 500MHz
Alpha-21264 is not much faster than 500MHz/600MHz P-IIIs, K6-3s, or K7s
on SPECint95.

=Ernst=



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