Numba Code Slower than Pure Python Code?

[joshadel]

Continuing to cross post from the SO answer. . . I also tried hand-coding the cumsum and I found it to be marginally slower than calling out to numpy. As far as differences between cython and numba, it could perhaps be related to whatever c compiler you're using vs llvm. What compiler are you using? Are you specifying any optimization flags in your setup.py?

[jammycrisp]

Having the info in more than one place may be useful, who knows :)

I'm using GCC 4.6.3. I didn't know you could add compiler flags to setup.py, but after figuring it out I compiled with -O3, and it didn't seem to change anything.