Using Cython, psyco and other tricks to make Python run faster

This is a good post showing how “perrygeo” uses Cython to speed up a pure Python function. The comments also discuss alternatives and options:

• Using psyco instead of Cython
• Using optimization flags for gcc
• Using xxx instead of math.xxx

http://www.perrygeo.net/wordpress/?p=116

There are also the official Cython docs, and the Cython basic tutorial (hello world of cython)

xxx instead of math.xxx

I tried a simple benchmark of math.cos versus cos()

import math
from math import cos, pi
import time as t

ten_mill = 10000000

def do_mathcos():
    print 'do math.cos'
    x = math.pi
    i = ten_mill
    t0 = t.time()
    while(i):
        x = math.cos(x)
        i -= 1
    print t.time() - t0

def do_cos():
    print 'do cos'
    x = pi
    i = ten_mill
    t0 = t.time()
    while(i):
        x = cos(x)
        i -= 1
    print t.time() - t0

do_mathcos()
do_cos()

# OUTPUT:
# do math.cos
# 1.95301318169
# do cos
# 1.49543499947

So about 25% speedup, just by using:

from math import cos
# and calling cos()

Instead of:

import math
# and calling math.cos()