Hi, I am running two softwares that use OMPI-2.0.1. Problem is that the CPU utilization is low on the nodes.
For example, see the process information below [root@compute-0-1 ~]# ps aux | grep siesta mahmood 14635 0.0 0.0 108156 1300 ? S 21:58 0:00 /bin/bash /share/apps/chemistry/siesta-4.0-mpi201/spar/siesta.p1 A.fdf mahmood 14636 0.0 0.0 108156 1300 ? S 21:58 0:00 /bin/bash /share/apps/chemistry/siesta-4.0-mpi201/spar/siesta.p1 A.fdf mahmood 14637 61.6 0.2 372076 158220 ? Rl 21:58 0:38 /share/apps/chemistry/siesta-4.0-mpi201/spar/siesta mahmood 14639 59.6 0.2 365992 154228 ? Rl 21:58 0:37 /share/apps/chemistry/siesta-4.0-mpi201/spar/siesta Note that the cpu utilization is the third column. The "siesta.pl" script is #!/bin/bash BENCH=$1 export OMP_NUM_THREADS=1 /share/apps/chemistry/siesta-4.0-mpi201/spar/siesta < $BENCH I also saw a similar behavior from Gromacs which has been discussed at https://mailman-1.sys.kth.se/pipermail/gromacs.org_gmx-users/2016-October/108939.html It seems that there is a tricky thing with OMPI. Any idea is welcomed. Regards, Mahmood
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