GPC MPI Versions

OpenMPI

To use OpenMPI compiled with intel load the modules

module load openmpi intel  

or for the gcc version use

module load openmpi/1.3.3-gcc-v4.4.0-ofed gcc 

The MPI libraries wrappers for compiling are mpicc/mpicxx/mpif90/mpif77.

OpenMPI has been build to support various communication methods and automatically uses the best method depending on how and where it is run. To explicitly specify the method you can use the following --mca flags on ethernet

mpirun --mca btl self,sm,tcp -np 16 -hostfile $PBS_NODEFILE ./a.out

and the following for infiniband

mpirun --mca btl self,sm,openib -np 16 -hostfile $PBS_NODEFILE ./a.out

For more information on available flags see the OpenMPI FAQ

MVAPICH2

MVAPICH2 is a MPICH2 derivative primarily designed for MPI communications over Infiniband. To use MVAPICH2 compiled with the intel compilers for infiniband load the modules

module load mvapich2 intel

or for the ethernet version use

module load mvapich2/1.4rc1-3378_intel-v11.0-tcpip intel

The MPI libraries wrappers for compiling are mpicc/mpicxx/mpif90/mpif77.

MVAPICH2 requires a .mpd.conf<\tt> file containing the variable "MPD_SECRETWORD=..." in your $HOME directory. To create this file use

echo "MPD_SECRETWORD=ABC123" > ~/.mpd.conf
chmod 600  ~/.mpd.conf

The easiest way to run is to use mpirun_rsh as follows

mpirun_rsh -np 16 -hostfile $PBS_NODEFILE ./a.out

IntelMPI

IntelMPI is also a MPICH2 derivative. To use IntelMPI compiled with the intel compilers load the modules

module load intelmpi intel

The MPI libraries wrappers for compiling are mpicc/mpicxx/mpif90/mpif77.

INTELMPI also requires a .mpd.conf<\tt> file which is described in the MVAPICH2 section.

The easiest way to run is to use mpirun_rsh as follows

mpirun_rsh -np 16 -hostfile $PBS_NODEFILE ./a.out