Re: Compaq Visual Fortran discontinued: upgrade to Intel Visual Fortran?

FCC articulated on 11/28/2005 8:06 PM:

>NN articulated on 11/28/05 17:25:
>
>
>>Hi,
>>I use the latest version of Compaq Visual Fortran on a Windows system. CVF
>>development is being discontinued as of the end of this year. They offer an
>>upgrade to Intel Visual Fortran 9.0. Any thoughts on whether this is
>>advisable/desirable/necessary would be highly appreciated. Does anybody have
>>experiences going that route already?
>>Thanks a lot.
>>--hh
>>
>>
>
>When I compile my nonlinear finite element code using
>
>ifort -O3 -ip -ipo -c *.f90
>
>the resulting executable is roughly 3 times faster than that produced by
>
>g95 -O3 -malign-double -march=pentium4 -mfpmath=sse -funroll-loops
>-ffast-math -c *.f90
>
>on Debian Linux version 3.1 running on Pentium M 1.7 GHz with 1GB RAM.
>Note that, if I use the -fast option of ifort, execution is even faster
>but the results produced are garbage and thus this does not count.
>
>Of course, this does not provide a comparison of ifort with CVF's f90.
>However, CVF's f90 does not run on Linux, and the comparison above might
>give a hint as to how well ifort performs.
>
>Does CVF's f90 perform 3 times better than g95 on Windows using the same
>switches?
>
>
>
OK, I had to boot to WinXP only to answer my own question. The
executable ifort produces on WinXP, using the same switches as above,
that runs 5 times faster than that produced by g95 (cygwin version).

--
FCC.

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