compilation - Considerations for compiling Fortran code to 64bit? -

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i'm working on scientific/engineering programs written in fortran 32bit unix system , have recompile new 64bit cluster , having trouble making sense of errors , changes should make.

i compile fortran programs 32-bit or 64-bit oses , haven't encountered problems. errors have seen? changing parallel program?

a program implemented best design philosophy of fortran >=90 requests numeric types according precision needs, e.g., using "selected_real_kind" specify number of digits needed in real type. compiler (on os , host computer) provides requested precision if can, or otherwise program refuses run. if requested precisions sufficient compute answer, approach should make portable program. isn't perfect since numeric computing model isn't totally specified.


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