On Montag 19 Oktober 2009, Michael Rule wrote: > I'm convinced that I need a prefix scan that gives me access to the > resultant prefix scanned array. > > so, for example, using addition, I would like a function that takes : > 1 1 1 1 1 1 1 1 1 1 > to > 0 1 2 3 4 5 6 7 8 9 > > It seems like this data should be generated as an intermeidiate step in > executing a ReductionKernel. I have not been able to figure out how this > data is accessed by browsing the GPUArray documentation. Am I missing > something obvious ?
Parallel Prefix Scan is presently not implemented in PyCUDA. While reduction is related, the scan is actually a somewhat different animal. PScan would be a most welcome addition to PyCUDA, however. Mark Harris has written a good introduction on how to implement it: http://is.gd/4rXq0 If you decide to follow Mark's guide, almost half your work is already done for you--reduction occurs as part of the prefix scan, so you'll be able to recycle a fair bit of code. HTH, Andreas
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