On Sat, Jan 21, 2012 at 10:50, Dominik Szczerba <dominik at itis.ethz.ch>wrote:
> Jed, Barry: thanks for the responses. I was aware of the related FAQ > entry but somehow thought only standard desktop SMPs were concerned. I > never suspected interconnect communication to be better than internal > memory bus... > You are conflating memory bandwidth with network bandwidth. You need memory bandwidth if you have a working set larger than cache, but each socket only has enough memory bandwidth for one or two cores, so adding more cores doesn't speed up your program. Network performance is a separate issue. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20120121/1e7efefa/attachment.htm>
