I believe there is an issue over the default setting for the number of sockets
on a node. We changed to discovering it in the 1.7 and beyond series, but the
default value in the 1.6 series got set to zero (it defaults to 1 I believe for
1.4).
Try adding "-mca orte_num_sockets N -mca orte_num_co
There appears to have been a change in the behaviour of -npersocket from
1.4.3 to 1.6.x (tested with 1.6.2). Below is what I see on a pair of dual
quad-core socket Nehalem nodes running under PBS. Is this expected?
Thanks
David
[dbs900@v482 ~/MPI]$ mpirun -V
mpirun (Open MPI) 1.4.3
...
[dbs90
