We moved the build platform for a large finite element code base written in FORTRAN to Intel(R) Visual Fortran Compiler 16.0. Earlier it was being compiled using Intel(R) Visual Fortran Compiler 15.0. While testing the compiled program, it was found that total execution time for different test cases has increased 50% to 200% for different test models when compared to the earlier version which was compiled using Fortran Compiler 15.0. We tested both 32bit and 64bit binaries. None of the compiler options were changed between these two versions and no source code has been changed. I am wondering what may cause this performance degradation. Any help will be appreciated.
You might not have changed compiler options but that does not mean there are no option changes as sometimes the defaults have changed. assume realloc_lhs or " buffered-io" might be ones to look at from fuzzy memories..... Look at the build logs for options also.