[Beowulf] Nehalem and Shanghai code performance for our rzf example
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Joe Landman landman at scalableinformatics.comSat Jan 17 10:16:28 PST 2009
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Kevin Abbey wrote: > Hi Joe, > Can that 9% difference be due to the Intel capability to overclock one > core and turn the others off? Hi Kevin: Not sure. May investigate at some point, but we should see a marked decrease in speedup over 4 threads on 4 cores if this is the case. > Or is does this Intel feature require manual switch somewhere? No 'switches'. Pure gcc, using -O3 flag, nothing "funky" in the code. Joe -- Joseph Landman, Ph.D Founder and CEO Scalable Informatics LLC, email: landman at scalableinformatics.com web : http://www.scalableinformatics.com http://jackrabbit.scalableinformatics.com phone: +1 734 786 8423 x121 fax : +1 866 888 3112 cell : +1 734 612 4615
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