Something like object creation, memory allocation, basic arithmetic, or cython calls seems to have become a lot slower recently.
Overall, my Python code using sage runs about 10% slower with 9.0.beta6 than with 8.9. The slowdown seems to be spread evenly across many different functions. But here is a simple example that shows a significant difference: # 8.9 sage: def f(): ....: a = 0 ....: for i in xrange(10^7): ....: a += 1 sage: %time f() CPU times: user 1.27 s, sys: 3 ms, total: 1.28 s Wall time: 1.27 s # 9.0.beta6 sage: def f(): ....: a = 0 ....: for i in range(10^7): ....: a += 1 sage: %time f() CPU times: user 1.71 s, sys: 0 ns, total: 1.71 s Wall time: 1.7 s Note that a similar function running an empty loop is quite a bit *faster* with 9.0.beta6 (as one may have expected with the Python upgrade): ~260 ms vs ~300 ms. Also, sage: %time a = 3**(2**30+1) and other computations using GMP with no back-and-forth with Python run at the same speed with both versions, so GMP/MPIR versions or build options are probably not to blame. Any clue what is going on? -- Marc -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/sage-devel/qrbugi%241h5h%241%40blaine.gmane.org.
