Author: Dann Corbit
Date: 16:15:02 01/09/01
Go up one level in this thread
On January 09, 2001 at 08:12:21, Steffen Jakob wrote: >[...] > >>>Setting a flag takes some time especially if its part of a bitset in a data >>>type. I wrote a little example where setting the flags of 160 MB takes 1.75 >>>seconds on my machine. Clearing the whole table with memset() takes 1.02 >>>seconds. I dont know, but if Steend does something additionally it might take 5 >>>seconds (or if the RAM is slower). >> >>Okay, your numbers are not unreasonable. You are still far below Jouni's 5 - 10 >>seconds. I got ~ 0.5 secs to clear 64 MB with memset on my machine. >>I think that you must really do a lot per entry in order to make it take 5-10 >>seconds. Wouldn't you agree to this, Steffen ? > >Yes, you are right. Maybe Steen can give us some information why it takes so >long. > >Greetings, >Steffen. > >P.S.: I once had a discussion with Chrilly about reducing the hash size when you >are low on time and he agreed that this was a good idea (but I dont think that >he added this to Nimzo). When doing EPD analysis with Crafty, if the time control is only a few seconds I get better results (deeper plies, higher NPS) by using a smaller hashsize than for deep analysis. I like 32 megs for 5 seconds, and 320 megs for one hour (machine has 512 megs).
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