[Beowulf] How to know if infiniband network works?

Christopher Samuel samuel at unimelb.edu.au
Wed Aug 2 16:13:36 PDT 2017

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,
 Christopher Samuel        Senior Systems Administrator
 Melbourne Bioinformatics - The University of Melbourne
 Email: samuel at unimelb.edu.au Phone: +61 (0)3 903 55545

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