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I am using a unix workstation with C shell. There were two compilers of mpif90, one compiled with ifort and one with gfortran, installed on the system. The default mpi compiler was the one compiled with gfortran.

Now, I want to change the default compiler to the ifort compiled one. It was stored in the folder "/usr/local/mvapich2-icc/bin". So I added the following to the ~/.cshrc file:

setenv mpif90 /usr/local/mvapich2-icc/bin/mpif90

and run "source ~/.cshrc" on the terminal. However, this seems not to have any effect. When I type "which mpif90", the path shown was still the gfortran compiled one.

How shall I set the environment properly so that the default compiler called was the ifort compiled one?

Any help would be appreciated. Thanks.

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The easiest way to do this is to just adjust the $PATH:

set path = (/usr/local/mvapich2-icc/bin $path)

However, this means that all executables in /usr/local/mvapich2-icc/bin/ will be found before the ones in your default path, which you might not want (I can't be sure).

Now, if you're compiling software with a Makefile, you'll probably be better off just defining the variables there to use the appropriate MPI compiler.

  • Thanks for the suggestion. Finally I have added the link in the Makefile and everything goes smoothly. :) – user45857 Jan 29 '15 at 2:25

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