[OMPI users] bind-to-socket across sockets with different core counts

[Noah Knowles]

Hi, newb here, so sorry if this is a dumb question but I haven't found 
an answer. I am running OpenMPI 1.7.2 on a small Rocks 6.1, Bladecenter 
H cluster. I am using the bind-to-socket option on nodes with different 
numbers of cores per socket. For the sample output below, compute-0-2 
has two 6-core sockets and compute-0-3 has two 8-core sockets.

[1,4]<stderr>:[compute-0-2.local:03268] MCW rank 4 bound to 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]]: [B/B/B/B/B/B][./././././.]
[1,5]<stderr>:[compute-0-2.local:03268] MCW rank 5 bound to socket 
1[core 6[hwt 0]], socket 1[core 7[hwt 0]], socket 1[core 8[hwt 0]], 
socket 1[core 9[hwt 0]], socket 1[core 10[hwt 0]], socket 1[core 11[hwt 
0]]: [./././././.][B/B/B/B/B/B]
[1,6]<stderr>:[compute-0-3.local:03816] MCW rank 6 bound to 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]]: [B/B/B/B/B/B/./.][./././././././.]
[1,7]<stderr>:[compute-0-3.local:03816] MCW rank 7 bound to socket 
0[core 6[hwt 0]], socket 0[core 7[hwt 0]], socket 1[core 8[hwt 0]], 
socket 1[core 9[hwt 0]], socket 1[core 10[hwt 0]], socket 1[core 11[hwt 
0]]: [././././././B/B][B/B/B/B/./././.]

Is this behavior intended? Is there any way to cause bind-to-socket to 
use all cores on a socket for the 6-core AND the 8-core nodes? Or at 
least to have that last binding not spread across cores on two sockets?
I've tried a rankfile too, but had errors-- that should probably be a 
separate thread though.

Thanks,
Noah