Hi Ralph, The allocation looks fine, but why it show number of slots as 1. The executions host has 4 processor, in nodes file also defined np=4.
====================== ALLOCATED NODES ====================== Data for node: Name: node56.beowulf.cluster Num slots: 1 Max slots: 0 ================================================================= ======================== JOB MAP ======================== Data for node: Name: node56.beowulf.cluster Num procs: 4 Process OMPI jobid: [17538,1] Process rank: 0 Process OMPI jobid: [17538,1] Process rank: 1 Process OMPI jobid: [17538,1] Process rank: 2 Process OMPI jobid: [17538,1] Process rank: 3 ============================================================= Hello World! from process 0 out of 4 on node56.beowulf.cluster Hello World! from process 2 out of 4 on node56.beowulf.cluster Hello World! from process 1 out of 4 on node56.beowulf.cluster Hello World! from process 3 out of 4 on node56.beowulf.cluster On 9 June 2010 17:31, Ralph Castain <r...@open-mpi.org> wrote: > mpirun --display-allocation --display-map -np 4