'-fast' option is a bit dangerous for MPI applications because all libraries are linked statically and you may have problems with fast interconnects (or may not). It's equivalent to:
"-xHOST -O3 -ipo -no-prec-div -static"
(HOST is a code name for platform) Much better to use :
"-xHOST -O3 -ip -no-prec-div"If you need to link Intel MPI library staticaly he can use '-static_mpi' option.