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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