Re: blas bindings, why are they so much slower the C?
patperry at stanford.edu
Thu Jul 24 19:22:34 EDT 2008
Last month Anatoly Yakovenko published some disturbing numbers about
the Haskell BLAS bindings I wrote being significantly slower than
using plain C. I wanted to let everyone know that I've closed the
performance gap, and now for doing ten million dot products, the
overhead for using Haskell instead of C is about 0.6 seconds on my
machine, regardless of the size of the vectors. The next version will
incorporate the changes. If you can't wait for a formal release, the
darcs repository is at http://www-stat.stanford.edu/~patperry/code/blas/
Anyone interested in more details can check out my blog:
Thanks everyone for the input on this (especially Anatoly). If any
else finds any performance discrepancies, please let me know and I
will do whatever I can to fix them.
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