On Sun, Jul 19, 2015 at 4:57 PM, Jason Moore <moorepa...@gmail.com> wrote: > I just tried this out with jacobian() and subs() over the commits since > 0.7.3 to master. It's showing me that the new caching is the killer > slowdown: > > https://github.com/sympy/sympy/commit/a63005e4 > > I've submitted a PR to Björn's repo: > https://github.com/bjodah/sympy_benchmarks_bjodah/pull/1/files > > I'm assuming it uses fastcache because I have it installed, but maybe not. > I'm not sure how to control for dependencies yet.
I modified your benchmark to first do the substitution for symbols, only then do the Jacobian: https://github.com/sympy/symengine/commit/2ababdb89e6c6db04d4a5df3e30185b824de9c0c Here are the results: certik@redhawk:~/repos/symengine/benchmarks(py)$ python kane2.py Setup Converting to SymEngine... SymPy Jacobian: Total time: 0.155253887177 s SymEngine Jacobian: Total time: 0.00277400016785 s Speedup: 55.97x I played with the cache size, it makes no difference. Your original benchmark ran about 1s on my machine, with SYMPY_CACHE_SIZE=5000 it took about 0.9s. So you can speedup SymPy itself just by using symbols instead of functions by a factor of 5.8x. Btw, I tested that the result that I get from symengine is exactly the same as in sympy (https://github.com/sympy/symengine/commit/2ababdb89e6c6db04d4a5df3e30185b824de9c0c#diff-e423f8edd8641c702513b2ea9c10eaecR32). How did you generate the benchmark? Can you generate a bit larger matrix? Once the symengine benchmark runs in about 1s, then I can try to speed it up (because I would see the result in the timing more easily). Ondrej -- You received this message because you are subscribed to the Google Groups "sympy" group. To unsubscribe from this group and stop receiving emails from it, send an email to sympy+unsubscr...@googlegroups.com. To post to this group, send email to sympy@googlegroups.com. Visit this group at http://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/CADDwiVDf9OLX1H3dS2Ugnr1bH%2BX-Q_dOziwWGB7asUWDCvUJ4Q%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
