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Planet Python PyMT

Python: is X is better than Y ? Round 3, pure python VS cython

Round 3: pure python drawing VS cython

Benchmark code :

s = time.time()
for x in xrange(10000):
   drawRectangle(0, 0, 50, 50)
print 'result=', time.time() - s

Let’s take the Python version of simplified drawRectangle():

def drawRectangle(x, y, w, h):
   glBegin(GL_QUADS)
   glVertex2f(x, y)
   glVertex2f(x + w, y)
   glVertex2f(x + w, y + h)
   glVertex2f(x, y + h)
   glEnd()

I got the result on poor graphics card: average ~1.1268s

Let’s rewrite in Cython:

cdef extern from "GL/gl.h":
   ctypedef float         GLfloat
   ctypedef unsigned int  GLenum
   int GL_QUADS
   cdef void glBegin(GLenum mode)
   cdef void glEnd()
   cdef void glVertex2f(GLfloat x, GLfloat y)
def drawRectangle(float x, float y, float w, float h):
   glBegin(GL_QUADS)
   glVertex2f(x, y)
   glVertex2f(x + w, y)
   glVertex2f(x + w, y + h)
   glVertex2f(x, y + h)
   glEnd()

And the result : average ~0.0325s

PyMT Impact: rewriting graphx package 🙂

EDIT:
On a NVIDIA 9800 GT: with 1000000 (instead of 10000):

  • Python: 16.1
  • Python -O: 17.2
  • Python -OO: 16.9
  • Cython: 0.29

Very weird about -O / -OO…

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