Author: Amir Ban
Date: 03:06:13 06/05/03
Go up one level in this thread
On June 04, 2003 at 22:24:59, Robert Hyatt wrote: >On June 04, 2003 at 18:32:43, Amir Ban wrote: > >>On June 04, 2003 at 14:54:30, Anson T J wrote: >> >>>Has anyone noticed if you do engine matches with Junior 8 / Deep Junior 8, ZX, >>>YY (any of them). If you set 1 thread per engine (on a dual machine), they share >>>1 cpu with a net cpu usage of 50% !! >>> >>>Deep Fritz 7, Shredder 7 / 7.04 and all other SMP engines I know of don't have >>>this problem. >>> >>>I guess the Junior 8 engines fix the affinity of the single cpu setup meaning in >>>an engine match or tournament they share the same cpu instead of using one each. >>> >> >>Didn't think of this, damn. >> >> >>>Any fixes known? >>> >> >>The problem should come up whenever running one DJ version against another with >>no. of threads set to less than no. of processors. I can't think of any >>workaround. I should get rid of processor affinity in that case. >> >>Amir > > >What's the reason for doing this? The O/S should handle this by itself and >avoid flipping a single process back and forth between physical processors, >without the program itself being involved in the decision... Maybe. The general considerations of an o/s are not the same as of a chess engine. On the particular o/s and time I tried it seemed worth doing. Amir
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