Re: [CentOS] fotran 77 with amd64 technology

Pavel Ritto wrote:

What is the right way to compile a fortran 77 file using the amd64 bits technology? If I write f77 -m64 -march=opteron file.f and then run a.out, the time of execution is so slow as if it I had´nt called to 64bits option. what is happening?

I thought the Gnu Fortran compiler was called g77 ? ... oh, I see, f77 is a link to g77. yes, -m64 should generate x86_64 code... I dunno what -march=opteron does.

otherwise, insufficient information to diagnose your problem. was this fortran program written for GCC F77 ? is it slow because its CPU bound or is it slow because its swapping?

(note, btw, I haven't actually touched fortran since the 1970s)