Author: Robert Hyatt
Date: 10:44:21 02/07/99
Go up one level in this thread
On February 07, 1999 at 12:30:06, James B. Shearer wrote: >On February 05, 1999 at 17:58:27, Robert Hyatt wrote: > >>On February 05, 1999 at 00:13:59, James B. Shearer wrote: > ><snip> > >>> time=120:00 cpu=99% mat=0 n=436256725 fh=4% nps=60589 >>> ext-> checks=49824007 recaps=1196664 pawns=18327198 1rep=14431267 >>> predicted=0 nodes=436256725 evals=82091710 >>> endgame tablebase-> probes done=0 successful=0 maxd=32 >>> hashing-> trans/ref=32% pawn=1% used=w99% b99% >>>White(41): quit >>>execution complete. >> >> >>this says something is wrong. pawn=1% means you are running about 1/2 the >>speed you normally should. Check the size of hashp as it is either bogus or >>something else is broken. >> >>fh=4% is impossible. That means that in only 4% of the nodes where the search >>fails high it fails high on the first move. The lowest value I have ever seen >>here is 88%, and it is normally above 90%. Is this a stock crafty, or one you >>compiled yourself? IE it is possible that the compiler is breaking something. > > I am using wcrafty_16.3.exe downloaded from your site. I downloaded it >again and the copies were identical. I think hashp is ok, most positions pawn >is circa 95%. Is crafty supposed to be completely determinstic (except for >slight timing differences) on a 1-cpu system? I tried running the 2 hour search >again and the results were a bit different. The moves were the same (with >similar times) but the summary block became: > > time=122:22 cpu=99% mat=0 n=209963723 fh=89% nps=28595 > ext-> checks=21642959 recaps=582085 pawns=10695067 1rep=7462442 > predicted=0 nodes=209963723 evals=34605063 > endgame tablebase-> probes done=0 successful=0 maxd=32 > hashing-> trans/ref=33% pawn=10% used=w99% b99% > > James B. Shearer searches to the same _depth_ should be deterministic. Searches to the same _time_ won't be, although they should be close. pawn hash hits at 10% is _very_ low, it just means you are over-searching the pawn hash table badly which slows things way down (most pawn evaluations are now computed rather than hashed). I normally see 99% pawn hashes all the time here...
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