Hi,<br><br>I am a newbie to the MPI in general. Currently in our institute, we have a cluster of 16nodes-8processors. It is an HP-XC 3000 cluster which basically means, it's quite proprietary. It has its own MPI implementation - HP-MPI - in which, the parallelization is managed by SLURM (Simple Linux Utility for Resource Management). There is also a batch job scheduler - LSF (Load Sharing Facility) which works in tandem with SLURM to parallelize the batch jobs. We have installed both MPICH and MPICH2 and are testing it, but we are running into compatibility issues. For a simple helloworld.c program:<br>
1. For HPMPI: Compiled with mpicc of this implemetation and executed with its mpirun: mpirun -np 4 helloworld works correctly. For batch scheduling, we need to isse "bsub -n4 [other options] mpirun -srun helloworld" and it runs fine too. "srun" is SLURM utility that parallelizes the jobs.<br>
2. For MPICH and mPICH2: Again, compiled with mpicc of these respective implemetations and executed with their own mpirun:<br> i) mpirun -np 4 helloword : Works.<br> ii) mpirun -np 15 helloworld: The parallelization is limited to just a single node - that is 8 processes run first on 8 processors of a single node and then remaining ones.<br>
iii) bsub -n4 [options] mpirun -srun hellowrold: Job terminated. srun option not recognized.<br> iv) bsub [options] mpirun -np 4 helloworld: Works<br> V) bsub [options] mpirun -np 15 helloworld: (Same as iii)<br><br>
Anybody aware of HP cluster issues with MPICH? Am I misinterpreting? Any help is appreciated.<br clear="all"><br>Gauri.<br>---------<br>