[Pyrex] Pyrex method 10x slower than Python, any hints why?

[David Chiang]

Hello all, when I compare this method
   
     def estimate(self, r):
         sum = 0.0
         for i in xrange(r.e.arity()+1):
            cost = lookup_words(self.ngram, None, [r.e.getchunk(i)], 1, 0, self.mapdigits, self.ceiling) 
             sum = sum + cost
                                                                                  
         return sum
   
   against a Pyrex equivalent
   
       def estimate(self, rule.Rule r):
           cdef float sum, cost
           cdef int i
           sum = 0.0
           for i from 0 <= i <= r.e.arity():
              cost = lookup_words(self.ngram, None, [r.e.getchunk(i)], 1, 0, self.mapdigits, self.ceiling) 
               sum = sum + cost
                                                                                  
           return sum
 
 where the containing class is a user class and self.ngram, r, and r.e are instances of extension types, the Python version runs, it would seem, 10 times faster. I've looked a bit at the generated C code (attached) and didn't see anything obviously wrong; does anyone have any hints about what may be going on? I realize this is kind of a vague question but any pointers for further testing would be appreciated. Thanks in advance!
   
 David
   
   
 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: estimate.c
Type: text/x-c
Size: 5252 bytes
Desc: not available
Url : http://lists.copyleft.no/pipermail/pyrex/attachments/20060531/20f2937e/attachment.bin