Author: Eugene Nalimov
Date: 09:42:41 10/13/99
Go up one level in this thread
On October 13, 1999 at 10:17:59, Robert Hyatt wrote: >On October 13, 1999 at 08:54:43, Jouni Uski wrote: > >>On October 13, 1999 at 08:09:13, Robert Hyatt wrote: >> >>>On October 13, 1999 at 01:10:30, Harald Faber wrote: >>> >>>>On October 13, 1999 at 01:04:05, Jouni Uski wrote: >>>> >>>>>Yes from latest SSDF list You see that Hiarcs7.32 with tablebases is only >>>>>2 points over Hiarcs7 without them. Hmm. Not much benefit from 100+ MB packed >>>>>data... >>>>> >>>>>Jouni >>>> >>>>Argh!!! >>>>The question is how much below would Hiarcs7.32 be WITHOUT the tablebases... >>> >>> >>>Even more important, how would _other_ programs do? Hiarcs has an apparently >>>very conservative approach to probing in the search, based on some numbers that >>>were posted here recently. It is not surprising that tablebases don't make any >>>difference given that circumstance. >> >>Bob. I just installed Crafty 16.15 (TB version) under Fritz5.32. It's >>unbelievable how Crafty can access TB dynamically (in search) without slowing >>NPS much. >>How is this possible? I remember when I tested same thing with Mchess 7 NPS >>go down to about 1knps (it was P90 PC then). >> >>Jouni > >Several things. (1) Eugene's buffering code is quite good; (2) if you only >probe _after_ a capture, and only when pieces <= 5, the probes aren't done >a ridiculous number of times. (3) I did a _lot_ of testing to find a way to >steadily increase the depth at which probes occur without smashing the search >back to 1K nps as you mentioned. (4) My indexing schema is optimized for probing by chess programs - I am trying to increase locality of references. That helps a lot, as after first probe there are good chances that block that was read contains results for second, third, ... probes. Eugene >And don't forget that a CD will kill me. And if you really want to see it >probe, try 10K rpm LVDS drives at 80 mbytes/second transfer rate.
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