Author: Ernst A. Heinz
Date: 05:56:06 03/14/98
Go up one level in this thread
On March 13, 1998 at 17:40:31, Robert Hyatt wrote: > >I also meant to add that I have been running an interesting experiment >for the past 2 weeks. I have been running *identical* copies of Crafty, >using *identical* books and everything (including hash size) with the >only difference being the hardware. Crafty is still on the P6/200 that >it always. Scrappy is on a PII/300, which reports itself to be 1.41 >times faster than the P6/200. > >After about 700 games played by each on ICC, Crafty has been hanging in >at >2700-2750 on ICC. Scrappy has been consistently at 2900-3000. I'm not >quite sure what to make of this, because that 41% faster doesn't >translate >into that big a change. But, yet, I have gotten comments from computer >operators (IE Max running ZarkovX) that "scrappy is a real problem for >us >where we were playing even or winning slightly more than 50%". I've >gotten >the same response from folks that are running other programs (ie genius >5 on >a PII/333 for example.) > >So this fritz situation could be caused by lots of things, including the >SSDF just *happening* to test it on the machine it runs the very best >on. > >I'll report back with more data, but both crafty and scrappy have been >playing the same "pool" from Roman to Dlugy to Shirov to the usual >programs >like ZarkovX, WchessX, Genius, Fritz and others. So *something* is >going >on here. I have observed something similar when playing "DarkThought" on >= 500MHz Alphas with 256MB RAM against good commercial programs (Fritz 3 & 5, Genius 3 & 5, Rebel 8 & 9, Shredder 1) on a 233MHz AMD K6 with 64MB RAM. Especially in (semi-) endgame positions with reduced material a speed difference of 50% or more coupled with a large hash table often buys at least one other ply of search depth which seems to turn many losses into draws and draws into wins. In more complex middlegame positions, however, the overall effects of increased search speed and larger hash tables are not that sharply visible. =Ernst=
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