Dear Intel Experts,
I describe here an issue relative to control on math lib to be used by an application under Linux.
Situation:
1. When a compiled fortran code is executed, the computation time is T
2. When this same fortran code is transformed as a dynamic lib of a C++ application, the execution is 5*T.
It was identified that cos() calls in the fortran code were responsible for that performance downgrade:
in configuration 1, it is cos() of lib libimf.so that is called.
In configuration 2, is is cos() of lib libm.so.6 that is called
How to keep control on Library to be used in configuration 2? I make you note that there is neither #include <cmath> nor #include <mathimf> in the C++ code.
Thanks for your help
Best regards,
Gael Couturier
ESI-Group
