Edward Grace wrote:
N.B. The final timing of qi_parse against itself is zero percent within the nominal precision. At first I thought the 1000% speedup of qi_parse was a fake due to some compiler shenanigans. Now I don't think so. I think it really is that much faster for small buffers! Note that this timing experiment took ~6mins.
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Same results - actually better since the experiment is quicker and the 95th percentile range is therefore narrower. Obviously I'm suspicious that something funny's going on - would you expect it to be capable of being ~10x faster?
Interesting... It seems that spatial locality strongly favors optimized Spirit code very well -- best when the data structure can reside fully in the cache. Try bumping the size incrementally and I expect a big dip in performance at a certain point. Regards, -- Joel de Guzman http://www.boostpro.com http://spirit.sf.net