Wes Bauske (wsb@paralleldata.com)
Tue, 19 Jan 1999 21:59:57 +0000
Andrei A. Dergatchev wrote:
>
> Hi,
>
> Sorry I haven't yet upgraded my RH so I can't help but as
> I'm working with g77 too I'm very interested in the problem.
>
> Could you please eleborate? Some code/timing so I'll be
> able to check and compare?
>
> Rgds,
>
> Andrei
>
> > After I recently installed 5.1 on my UDB, I noticed than my fortran
> > programs compiled with g77 from egcs-1.0.3a run about 30 to 50 % slower
> > than the same programs compiled with the same compiler under 5.0.
> > Has anybody observed such behaviour, if so, is it specific for UDB
> > and is there anything one can do about it ? In fact, also xemacs I compiled
> > from source RPM under 5.1 is on startup about a factor of 2 slower
> > than the one I had installed from RPM taken from xemacs.org under 5.0,
> > so the problem might not be specific only for fortran.
> >
> > Thanks for any idea,
> >
> > Roman Martonak.
Maybe your code depends on libm, and you need to
use the fast math libs. Forgot at what point the
math lib routines reverted to slow code but if
your code depends on libm, you would see a
significant performance hit.
Wes
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