Author: Jeremiah Penery
Date: 13:31:45 09/15/99
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On September 15, 1999 at 13:46:13, José de Jesús García Ruvalcaba wrote: >On September 14, 1999 at 18:18:46, Jeremiah Penery wrote: > >>On September 14, 1999 at 09:39:58, Robert Hyatt wrote: >> >>>On September 14, 1999 at 09:26:28, James Flanagan wrote: >> >>>>How big should the cache be with 64Mb of RAM? >>>> >>>>Are there any other critical parameters that I need to set to get optimum >>>>performance? >>>> >>> >>> >>>the best you can do is probably hash=48m, hashp=8m. and if you are using >>>compressed tablebases, that won't work. Then you will have to try >>>hash=24m, hashp=8m and cache=8m and see how that does... >> >>With Win98, I wouldn't suggest setting hash=48m, especially if you are running >>ANYTHING else. The OS just eats up way too much memory, and you'll get disk >>paging, which will slow you down a lot. With 64MB on my machine, I usually use >>hash=12m and hashp=4m. It's possible to set hash=24m...Sometimes it works ok >>and sometimes not. Either way, there will be VERY LITTLE difference in >>strength/speed/etc. Bob did an experiment with different hash sizes a while >>back to see the performance impact...Perhaps I can dig it up a little later and >>post it. IIRC, there was no significant difference anywhere between a small >>hash (4m, even?) and a very large one (384m). >> >>Jeremiah > > NPS is not the way to compare crafty's performance with different hashtable >sizes in the same machine. Actually, crafty scores a higher number of nodes with >smaller hash tables, but does less useful work as many of them are repeated. > The search depth reached in the same amount of time is more significative. As >long as you do not swap to disc, the bigger hashtables allow crafty to search >deeper in the same amount of time (or to search to the same depth in less time). >José. I never mentioned NPS. Bob's experiment compared the times to reach ply-N with the different hash sizes. I really need to look this up, however, as I am not 100% sure. Jeremiah
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