Flexible test support with openmpi's mpirun

[jgphpc]

pilatus.py

flexible_openmpi.py

Running:

reframe -c flexible_openmpi.py -p PrgEnv-openmpi --system pilatus:normal2 \
-S flexible=True --flex-alloc-nodes=2 --dry-run

will produce a rfm_job.sh file:

#SBATCH --ntasks=8
#SBATCH --ntasks-per-node=4
mpirun -np 0 echo

if the config file sets 'launcher': 'mpirun'.

If the config file sets 'launcher': 'srun', no issue:

#SBATCH --ntasks=8
#SBATCH --ntasks-per-node=4
srun echo

Removing -np from https://github.com/reframe-hpc/reframe/blob/develop/reframe/core/launchers/mpi.py#L113 works but not what we want.

[vkarak]

Yes, as discussed in Slack, this is bug:

I think that’s a bug. The commands to be emitted in the launcher line are constructed too early, so when the job’s num_tasks are updated and the script is emitted, the old value of 0 is used.