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I’m compiling my code on a server that has OpenMPI, but I need to know which version I’m on so I can read the proper documentation. Is there a constant in <mpi.h> that I can print to display my current version?
With OpenMPI, the easiest thing to do is to run
ompi_info; the first few lines will give you the information you want. In your own code, if you don’t mind something OpenMPI specific, you can look at useOMPI_MAJOR_VERSION,OMPI_MINOR_VERSION, andOMPI_RELEASE_VERSIONin mpi.h. That obviously won’t work with MPICH2 or other MPI implementations.More standardly, as part of MPI-3, there is a standard MPI routine called MPI_Get_library_version which gives you detailed library information at run time. This is small enough and useful enough that newer versions of MPI implementations will have this very quickly – for instance it’s in the OpenMPI 1.7 development trunk – but it doesn’t really help you today.