Author: Ernst A. Heinz
Date: 10:46:21 03/05/98
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On March 05, 1998 at 12:29:24, Albert Silver wrote: >On March 04, 1998 at 08:39:33, Robert Hyatt wrote: > >>On March 04, 1998 at 01:15:54, Jouni Uski wrote: >> >>> >>>>This has to be operator error, because there is *nothing* in win95 that >>>>will cause this behavior, other than setting hash tables a little too >>>>big >>>>and causing swapping... >>>> >>> >>>It is not any operator error. Specially in endgames Genius in dos (/X) >>>mode is often 2X faster, than windows version even with about same >>>hash sixe. >> >>I don't want to get into a heated argument here, but my background is >>operating system development, and I've been in that environment for >>almost >>30 years, and I can't think of a single reason why a program would run >>2x >>slower under win95, if you discount the paging problem. And if you >>discount >>the problem of having multiple applications running and sharing cpu >>resources. >> >>Other than those two things, there is *nothing* I can think of that >>would >>cost you 2x. You ought to run the windows resource monitor to see what >>is >>going on, because I have never seen this outside of the two exceptions >>mentioned above... > >Well, I can't comment on Genius 5 as I don't have it, but I have noticed >a similiar (80% difference on the average) performance hit when running >Mchess 7.01 in DOS as opposed to Win95. I can assure that it is not due >to any TSRs or other software running in the background as if I call up >the special Rebel9 windows shortcut it runs almost identically in speed >as when run in DOS. I have no explanation for it but I can give you test >suite results with the resource monitor's results as well for your >examination. > > Albert A plausible explanation for this strange behavior might be that task switches under Windows NT/95 badly thrash some CPU internals (caches, pipelines, branch prediction units etc.) -- I remember having read some tests which suggest exactly this. Some integer-bound applications therefore seem to run much slower under Windows NT/95 than under DOS. =Ernst=
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