I posted this question last year and we ended up not upgrading to the newer openmpi. Now I need to change to openmpi 1.10.5 and have the same issue.
Specifically, using 1.4.2, I can run two 12 core jobs on a 24 core node and the processes would bind to cores and only have 1 process per core. ie not oversubscribe. What I used with 1.4.2 was: mpirun --mca mpi_paffinity_alone 1 --mca btl openib,tcp,sm,self ... Now with 1.10.5, I have tried multiple combinations of map-to core, bind-to core etc and cannot run 2 jobs on the same node without oversubcribing. Is there a solution to this? Thanks for any info tom _______________________________________________ users mailing list users@lists.open-mpi.org https://lists.open-mpi.org/mailman/listinfo/users
