Re: [Apbs-users] APBS source install using Portland compilers

[Andreas Svrcek-S. <sv...@tb...>]

Hi,
> BTW: Does anyone have experience with Opteron/APBS and tell how much 
> performance gain I could expect by not using gcc? And has anyone experience 
> with gcc v4.X? How does gfortran perform compared to g77?
...This is - of course - non-authoritative:
A quick and dirty performance comparison seemed to show that
for APBS running on opterons, the runtime difference between
a g77/gfortran compiled version and a i(ntel)fort compiled one was 
negligible. I've also seen that the intel compiler produces code
that runs as fast or faster on opterons than opteron-optimized code 
produced by the pathscale compilers. So, summing up, as long as you're not 
using Pentium4 CPUs (where the difference is usually far greater),
gcc/g77/gfortran might be a good choice.

good luck
Andreas











-- 

             )))))
             (((((
            ( O O )
-------oOOO--(_)--OOOo-----------------------------------------------------
               o        Wolfgang Andreas Svrcek-Seiler
               o        (godzilla)
                        sv...@tb...
       .oooO            Tel.:01-4277-52733
       (   )   Oooo. 
-------\ (----(   )--------------------------------------------------------
         \_)    ) /
               (_/