On 03/08/17 02:44, Faraz Hussain wrote: > I have inherited a 20-node cluster that supposedly has an infiniband > network. I am testing some mpi applications and am seeing no performance > improvement with multiple nodes.
As you are using Open-MPI you should be able to tell it to only use IB (and fail if it cannot) by doing this before running the application: export OMPI_MCA_btl=openib,self,sm Out of interest, are you running it via a batch system of some sort? All the best, Chris -- Christopher Samuel Senior Systems Administrator Melbourne Bioinformatics - The University of Melbourne Email: sam...@unimelb.edu.au Phone: +61 (0)3 903 55545 _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org sponsored by Penguin Computing To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
