Computer Chess Club Archives




Subject: Re: typical nps on single cpus

Author: Dave Gomboc

Date: 00:16:33 02/14/00

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On February 13, 2000 at 17:44:43, Dan Newman wrote:

>On February 13, 2000 at 12:20:21, Will Singleton wrote:
>>On February 13, 2000 at 06:57:16, Dan Newman wrote:
>>>On February 13, 2000 at 03:35:50, Will Singleton wrote:
>>>>I am always interested in the nps kibitzed by programs playing on ICC.  You can
>>>>never be sure as to the accuracy, since one can fiddle with the numbers.  But I
>>>>was surprised the other day to see an amateur program getting in excess of 1
>>>>million nps on a 700mhz machine.  Many amateur progs get around 100knps or less.
>>>>Just wondering.  Anybody get close to or more than 1000 nps per mhz?
>>>Shrike gets about that.  A month or so ago it was hitting 530 knps on a
>>>PIII/500, but now it's down to 490 after adding a bunch of eval.  (These
>>>figures are average over WAC.)  It maxes out at about 750 knps--when there's
>>>only one pawn left :).  So I guess I'm at about 980 nps/MHz and going down...
>>What do you do to get that speed?  Bitboards, slim eval, anything else?
>Well, I tend to unroll loops, and avoid if-tests where possible.  I use
>switch statements to select just the right piece of code in the move
>generators and make/undo and thus avoid a lot of if-tests.  My code
>is rather bloated as a result: about 11,000 LOC with the comments stripped

How much faster do you think a switch is than using virtual dispatch?


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