What's an FPU?
On Tue, Apr 26, 2011 at 11:40 PM, Mihai Badoiu <mbad...@gmail.com> wrote: > Hi, > I have terrible performance for multiplication when one number gets very > close to zero. I'm using cython by writing the following code: > cdef int i > cdef double x = 1.0 > for 0 <= i < 10000000: > x *= 0.8 > #x += 0.01 > print x > This code runs much much slower (20+ times slower) with the line x += 0.01 > uncommented. I looked at the deassembled code and it looks correct. > Moreover, it's just a few lines and by writing a C code (without python on > top), I get the same code, but it's much faster. I've also tried using sse, > but I get exactly the same behavior. The best candidate that I see so far > is that Python sets up the FPU in a different state than C. > Any advice on how to solve this performance problem? > thanks! > -- > http://mail.python.org/mailman/listinfo/python-list > > -- http://mail.python.org/mailman/listinfo/python-list