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Old January 17th 04, 02:19 AM
Haj Trikolonialopolous
 
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Default -DSMP slower on single CPU machine

why would crafty be slower without -DSMP on a single cpu machine than
with it? That's counter-intuitive.
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Old January 17th 04, 02:22 AM
Haj Trikolonialopolous
 
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Default -DSMP slower on single CPU machine

Haj Trikolonialopolous wrote:

why would crafty be slower without -DSMP on a single cpu machine than
with it? That's counter-intuitive.



nevermind, it probably was the -DSINGULAR that slowed it down instead.
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Old January 17th 04, 03:33 AM
Robert Hyatt
 
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Default -DSMP slower on single CPU machine

Haj Trikolonialopolous wrote:
why would crafty be slower without -DSMP on a single cpu machine than
with it? That's counter-intuitive.


Pure luck. Omitting -DSMP slightly changes some of the code since the
SMP code is not compiled in. And sometimes, it serendipitously changes
the memory layout and slows down or speeds up the code, but not by very
much...


--
Robert M. Hyatt, Ph.D. Computer and Information Sciences
University of Alabama at Birmingham
(205) 934-2213 136A Campbell Hall
(205) 934-5473 FAX Birmingham, AL 35294-1170
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Old January 17th 04, 03:33 AM
Robert Hyatt
 
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Default -DSMP slower on single CPU machine

Haj Trikolonialopolous wrote:
Haj Trikolonialopolous wrote:


why would crafty be slower without -DSMP on a single cpu machine than
with it? That's counter-intuitive.



nevermind, it probably was the -DSINGULAR that slowed it down instead.


That will absolutely do it.



--
Robert M. Hyatt, Ph.D. Computer and Information Sciences
University of Alabama at Birmingham
(205) 934-2213 136A Campbell Hall
(205) 934-5473 FAX Birmingham, AL 35294-1170
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