Re: Similar systems, different performance of fortran code
Le vendredi 22 avril 2005 à 00:48 +0900, Victor Munoz a écrit :
> >
> > It could be that from g77-2.95 to g77-3.3 some standard optimisations
> > have been lost. Maybe in 3.3 the emitted code blows the CPU cache ...
> > Have you looked at your problem from this angle ?
> >
>
> It could be. Someone on the list suggested using the same compiler in both
> machines, to rule out this problem. I have to do that, but if there's some
> problem as the one you mention, how can it be investigated? Do you know?
Note that g77-2.95 is still available in Sarge. I am not sure for Sid
but both distros are close enough these days that you should find it.
Then, if you confirm that your problem is related to compiler vagaries,
I suggest you begin to lurk around the mailing lists of g77/gcc ... not
a small task. But your problem could be (a) either already known (and
workarounds too) or (b) entirely unknown, and then probably interesting
to the maintainers of the gcc suite.
Aurélien
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