S, I agree that MPI environment is to be configured, this hostfile or the hosts can be defined in mpirun options.
mpirun --hostfile or mpirun --host eg: mpirun –hostfile my_hostfile –np 4 a.out, mpirun –host Host1,Host2,Host3,Host4 –np 4 a.out mpi will use the hosts of this file Which can be used after the installation also. I suggested the yum installation,bcoz It will resolve the mpi libraries in the dependencies. This hosts option is available in Lam-mpi also as Lamboot -v hostfile., then mpirun In MPICH2, this MPI environment can be initialized by mpdboot hostfile. then mpirun, mpdrun every mpi can have a hostfile to initialize it after it properly installed.
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