Hello, I'm trying to tell OpenMPI how many processes per node I want to use, but mpirun seems to ignore the configuration I provide.
I create following hostfile: $ cat hostfile.16 taurusi6344 slots=16 taurusi6348 slots=16 And then start the app as follows: $ mpirun --display-map -machinefile hostfile.16 -np 2 hostname Data for JOB [42099,1] offset 0 ======================== JOB MAP ======================== Data for node: taurusi6344 Num slots: 1 Max slots: 0 Num procs: 1 Process OMPI jobid: [42099,1] App: 0 Process rank: 0 Bound: socket 0[core 0[hwt 0]], socket 0[core 1[hwt 0]], socket 0[core 2[hwt 0]], socket 0[core 3[hwt 0]], socket 0[core 4[hwt 0]], socket 0[core 5[hwt 0]], socket 0[core 6[hwt 0]], socket 0[core 7[hwt 0]], socket 0[core 8[hwt 0]], socket 0[core 9[hwt 0]], socket 0[core 10[hwt 0]], socket 0[core 11[hwt 0]]:[B/B/B/B/B/B/B/B/B/B/B/B][./././././././././././.] Data for node: taurusi6348 Num slots: 1 Max slots: 0 Num procs: 1 Process OMPI jobid: [42099,1] App: 0 Process rank: 1 Bound: socket 0[core 0[hwt 0]], socket 0[core 1[hwt 0]], socket 0[core 2[hwt 0]], socket 0[core 3[hwt 0]], socket 0[core 4[hwt 0]], socket 0[core 5[hwt 0]], socket 0[core 6[hwt 0]], socket 0[core 7[hwt 0]], socket 0[core 8[hwt 0]], socket 0[core 9[hwt 0]], socket 0[core 10[hwt 0]], socket 0[core 11[hwt 0]]:[B/B/B/B/B/B/B/B/B/B/B/B][./././././././././././.] ============================================================= taurusi6344 taurusi6348 If I put anything more than 2 in "-np 2", I get following error message: $ mpirun --display-map -machinefile hostfile.16 -np 4 hostname -------------------------------------------------------------------------- There are not enough slots available in the system to satisfy the 4 slots that were requested by the application: hostname Either request fewer slots for your application, or make more slots available for use. -------------------------------------------------------------------------- The OpenMPI version is "mpirun (Open MPI) 2.1.0" Also there is SLURM installed with version "slurm 16.05.7-Bull.1.1-20170512-1252" Could you help me to enforce OpenMPI to respect slots paremeter? -- Regards, Maksym Planeta
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