Author: Frank Quisinsky
Date: 14:13:04 01/14/04
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On January 14, 2004 at 17:00:51, Gian-Carlo Pascutto wrote: >The problem you are seeing is because any Windows versions prior to >Windows 2003 Server do not understand hyperthreading correctly (even the >claimed 'hyperthreading aware' Windows XP!). > >As a result, when you set MT=2, the two processes get randomly >scheduled between the 4 processors, including the case where >both processes are running on the same physical CPU. > >Use MT=4 or disable Hyperthreading, or upgrade OS. > >-- >GCP Hi Gian-Carlo, thanks for your information! I will try it tomorrow with newer Xeons 3.2 L3 and Windows 2003 Server! Shortly: If I read your answer ... That's means that I can set on Dual Xeon for SMP Eng - SMP Eng with ponder _not_ MT=2 ?! Right is (if I understand): SMP Eng - SMP Eng with ponder ... I have to set MT=1 and I have to set Hyper-Threading under Windows XP SP1 = off ?! Under Windows 2003 Server: SMP Eng - SMP Eng with ponder ... I have to set MT=2 and I can set Hyper-Threading = on !? ... MT setting in the case of Crafty! I will try it in the night with your engine too! Best Frank
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