Author: Thomas Mayer
Date: 05:43:37 12/20/03
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Hi Vincent, >I did 2 experiments: > >experiment A) I ran diep at 460 processors with 115MB hashtable *in total* >experiment B) Same diep version at 460 processors with 115GB hashtables. > >Note hashtable means transpositiontable here. Each processor had local 4.2MB >pawnhashtable and each processor had local 32MB evaluation table. > >MB = 10^6 , GB = 10^9 >#probes = 4 >entrysize = 16 bytes >position = r4rk1/p1q1nppp/b2b4/2nP4/1P3p2/P1N2N2/B1P3PP/R1BQK2R w KQ - > >What is the expected outcome? well, there are several unclear facts - e.g. how to usage of 460 processors is different to the usage of 1 processor etc. Anyway, let's try a guess and take the idea of Christoph Theron that hashtable doubling is about 7 Elo... We have 10 doublings, so 70 Elos expected... Doubling in speed is expected with around 60 Elos... So I expect a speedup of about 120-150%... How far am I away ?! :) Greets, Thomas
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