Philip Kovacs <pkde...@yahoo.com> writes: >>according to https://slurm.schedmd.com/mpi_guide.html I have built >>Slurm 19.05 with PMIx support enabled and it seems to work for both, >>OpenMPI and Intel MPI. (I've also set MpiDefault=pmix in slurm.conf.) > >>But I still don't get the point. Why should I favour `srun ./my_mpi_program´ >>over `mpirun ./my_mpi_program´? For me, both seem to do exactly the same >>thing. No? Did I miss something? > >>Best regards >>Jürgen > > Running a single job in isolation doesn't properly illustrate what slurm does > in the larger sense. > How do you fairly allocate and constrain the resources of an HPC installation > when 1,000 jobs need > to run, not just 1? How do you schedule the jobs? How do you keep track of > the resources used so > that charge-back or billing can occur? It's not about the ant -- it's about > the colony.
I think Jürgen may well be aware of what Slurm does in the larger sense. I suspect the question, which I also have, is more like: "What difference does it make whether I use 'srun' or 'mpirun' within a batch file started with 'sbatch'." Cheers, Loris -- Dr. Loris Bennett (Mr.) ZEDAT, Freie Universität Berlin Email loris.benn...@fu-berlin.de
