TAY wee-beng <[email protected]> writes: > Thanks for the advice. It took me a while to compile and build > successfully with gfortran due to the stricter rules and entirely > different options.
Writing portable standards-compliant code pays off. > But the most problematic thing was that most clusters I work with use > old versions of gcc/gfortran. With the gcc/gfortran tied to the MPI, it > seems that I can't just update myself to use the new version, or can I? They often have modules to access more recent versions. You can also request it. Paying to upgrade commercial compilers while leaving open source compilers at an old version is not good machine maintenance. > Also, can anyone recommend options to get optimized results in gfortran? > > I'm using : > > -fno-signed-zeros -fno-trapping-math -ffast-math -march=native > -funroll-loops -ffree-line-length-none -O3 I usually use this, with or without -ffast-math depending on requirements: -O3 -march=native -ftree-vectorize
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