IronPython vs CPython: faster in 1.6 times?

[Arnaud Delobelle]

On Feb 5, 8:01 pm, Istvan Albert <istvan.alb... at gmail.com> wrote:
> On Feb 5, 12:31 pm, dmitrey <dmitrey.kros... at scipy.org> wrote:
>
> > Hi all,
> > the urlhttp://torquedev.blogspot.com/2008/02/changes-in-air.html
> > (blog of a game developers)
> > says IronPython is faster than CPython in 1.6 times.
> > Is it really true?
>
> This is a second time around that IronPython piqued my interest
> sufficiently to create a toy program to benchmark it and I must say
> the results are not encouraging:
>
> $ python bench.py
> Elapsed time: 1.10 s
>
> $ ipy bench.py
> Elapsed time:65.01 s
>
> and here is the benchmark program:
>
> import time
> start = time.time()
>
> def foo(a):
>     return a * a
>
> data = {}
> for i in xrange( 10**6 ):
>     data[i] = foo(i)
>
> print 'Elapsed time:%5.2f s' % ( time.time() - start)

Could it be because .NET doesn't have arbitrary length integer types
and your little benchmark will  create lots of integers > 2**32 ?
What is the result if you replace foo(a) with

def foo(a): return sqrt(a)

--
Arnaud