A question about osyco

[iu2]

On Jan 29, 1:48 am, bearophileH... at lycos.com wrote:
> Marc 'BlackJack' Rintsch:
>
> > Try calling the iterative one twice and measure the time of the second
> > call.  IIRC psyco needs at least one call to analyze the function, so the
> > first call is not speed up.
>
> That's how Java HotSpot works, but Psyco is very different from
> HotSpot, and I think you are wrong.
> I don't exactly know the answer to the question of the OP, but I think
> the two functions are different: in the second function most time
> isn't spent in managing the xrange or in the assign, but in the sum
> between long ints, and Psyco can't speed up that operation (you need
> gmpy for that, and in certain tricky situations gmpy may even result
> slower, maybe when you use small numbers).
>
> Bye,
> bearophile

Thanks, that's probably it

I've tested

>>> timeit.Timer('c+d', 'from __main__ import c, d').timeit(1000)
6.6209532214145383e-005
>>> timeit.Timer('a+b', 'from __main__ import a, b').timeit(1000)
0.10513989906537802
>>>

where c and d are equal to 1, and a, b are very long integers
(a=b=fib2(100000))