After digging a little further I think this problem may better be called "False Sharing" and there is a wikipedia page about it: http://en.wikipedia.org/wiki/False_sharing
Additionally the common cache block size for intel processors is 64 words. And the caching protocols should maintain this consistently between processors if shared. Brad On Mar 16, 2012, at 3:16 PM, Lowekamp, Bradley (NIH/NLM/LHC) [C] wrote: > Hello, > > I have just made the StatisticsImageFilter go ~58X faster on my multi-core > platform for large data, by fixing the cache thrashing which was going on: > > http://review.source.kitware.com/#/c/4771/1 > > When adjacent memory is modified by different processors, it must maintain > consistency across the cores. This is of non-trivial expense then considered > on the per-pixel level. If anyone is looking for an example case of bad cache > thrashing I think this it about as good as you can do. > > I am just sending this e-mail to make sure everyone is on the look out for > this type of problem, and will take a note (Jira?) of where similar > enhancements can occur. > > > Thanks for keeping an eye out, > Brad > > ======================================================== > Bradley Lowekamp > Medical Science and Computing for > Office of High Performance Computing and Communications > National Library of Medicine > [email protected] > > > > _______________________________________________ > Powered by www.kitware.com > > Visit other Kitware open-source projects at > http://www.kitware.com/opensource/opensource.html > > Kitware offers ITK Training Courses, for more information visit: > http://kitware.com/products/protraining.php > > Please keep messages on-topic and check the ITK FAQ at: > http://www.itk.org/Wiki/ITK_FAQ > > Follow this link to subscribe/unsubscribe: > http://www.itk.org/mailman/listinfo/insight-developers
_______________________________________________ Powered by www.kitware.com Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Kitware offers ITK Training Courses, for more information visit: http://kitware.com/products/protraining.php Please keep messages on-topic and check the ITK FAQ at: http://www.itk.org/Wiki/ITK_FAQ Follow this link to subscribe/unsubscribe: http://www.itk.org/mailman/listinfo/insight-developers
