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Subject: Re: Multi processors chess question

Author: Robert Hyatt

Date: 08:18:36 03/05/01

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On March 05, 2001 at 03:07:09, Pham Minh Tri wrote:

>Hi all,
>
>If a chess program runs on a computer with N processors, how many times is it
>faster? N times? (compare with the same computer with 1 processor)
>
>Just a curious question because I have no computer with multiprocessor nor
>supercomputer :-(
\

There are two answers.

1.  If the program was written to use a parallel search, then you get one
answer.  I can't speak for everybody, but for the case of Crafty, the formula
is roughly this:

speedup = 1 + (N-1)*.7

where N is the number of cpus you have.

IE for my quad, this comes out to roughly 3.1 times faster using 4 processors.

2.  If the program doesn't know anything about a parallel search, then it will
get no speedup whatsoever no matter how many processors you have.

• Re: Multi processors chess question José de Jesús García Ruvalcaba 08:39:51 03/05/01
  • Re: Multi processors chess question Vincent Diepeveen 13:06:53 03/05/01
    • One more question Pham Minh Tri 16:25:28 03/05/01
      • Re: One more question Robert Hyatt 17:44:14 03/05/01
  • Re: Multi processors chess question Robert Hyatt 10:53:50 03/05/01

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