Hi Ralph,
Here is the result on patched openmpi-1.7rc8. mpirun -v -np 8 -hostfile pbs_hosts -x OMP_NUM_THREADS --display-allocation /home/mishima/Ducom/testbed/mPre m02-ld ====================== ALLOCATED NODES ====================== Data for node: node06 Num slots: 4 Max slots: 0 Data for node: node05 Num slots: 4 Max slots: 0 ================================================================= [node06.cluster:21149] HOSTFILE: CHECKING FILE NODE node06 VS LIST NODE node05 -------------------------------------------------------------------------- A hostfile was provided that contains at least one node not present in the allocation: hostfile: pbs_hosts node: node06 If you are operating in a resource-managed environment, then only nodes that are in the allocation can be used in the hostfile. You may find relative node syntax to be a useful alternative to specifying absolute node names see the orte_hosts man page for further information. -------------------------------------------------------------------------- Regards, Tetsuya