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Is there a reasonable number of pawn hash entries?
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Lucas Braesch



Joined: 31 May 2010
Posts: 1756
PostPost subject: Re: Is there a reasonable number of pawn hash entries?    Posted: Mon Jul 16, 2012 1:06 pm Reply to topic Reply with quote
Kempelen wrote:
Daniel Shawul wrote:
I did a test on 5 bratko kopec positions for 20 secs each. There is almost no improvement from additional pawn hash entries. The smallest number of entries I tried was 32k ~ 0.8MB and it is so far the best. Look at the nps figure for each of the positions below. Ofcourse the result will depend on time control used. I think smaller pawn hash table is good idea as most of it can reside in cache.


After doing some tests I arrive to conclude that 65535 entries is the best for my engine fast games.

Surely you mean 65536 ? If it's not a power of two you'll have to do a dichotomic search which is a waste of time. I also use 0x10000 = 65536 pawn hash entries.
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Subject Author Date/Time
Is there a reasonable number of pawn hash entries? Fermin Serrano Tue Jul 10, 2012 9:24 pm
      Re: Is there a reasonable number of pawn hash entries? Robert Hyatt Tue Jul 10, 2012 11:20 pm
            Re: Is there a reasonable number of pawn hash entries? Lucas Braesch Fri Jul 13, 2012 4:08 am
                  Re: Is there a reasonable number of pawn hash entries? Vincent Diepeveen Sat Jul 14, 2012 9:54 am
      Re: Is there a reasonable number of pawn hash entries? Vincent Diepeveen Tue Jul 10, 2012 11:49 pm
      Re: Is there a reasonable number of pawn hash entries? Daniel Shawul Thu Jul 12, 2012 2:41 am
            Re: Is there a reasonable number of pawn hash entries? Fermin Serrano Mon Jul 16, 2012 12:03 pm
                  Re: Is there a reasonable number of pawn hash entries? Lucas Braesch Mon Jul 16, 2012 1:06 pm
                        Re: Is there a reasonable number of pawn hash entries? Fermin Serrano Mon Jul 16, 2012 1:47 pm
                  Re: Is there a reasonable number of pawn hash entries? Daniel Shawul Tue Jul 17, 2012 11:18 am
      Re: Is there a reasonable number of pawn hash entries? Marcel van Kervinck Sat Jul 14, 2012 10:46 am
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