[Insight-developers] The Memory Consistency Problem, something everyone should know...

[Bradley Lowekamp]

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 
blowekamp at mail.nih.gov



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