Using openmpi 1.6.2 with intel 13.0 though the problem not specific to the compiler.
Using two 12 core 2 socket nodes,
mpirun -np 4 -npersocket 2 uptime
--------------------------------------------------------------------------
Your job has requested a conflicting number of processes for the
application:
App: uptime
number of procs: 4
This is more processes than we can launch under the following
additional directives and conditions:
number of sockets: 0
npersocket: 2
Any idea why this wouldn't work?
Another problem the following does what I expect, two 2 socket 8 core sockets. 16 total cores/node.
mpirun -np 8 -npernode 4 -bind-to-core -cpus-per-rank 4 hwloc-bind --get
0x0000000f
0x0000000f
0x000000f0
0x000000f0
0x00000f00
0x00000f00
0x0000f000
0x0000f000
But fails at large scale:
mpirun -np 276 -npernode 4 -bind-to-core -cpus-per-rank 4 hwloc-bind --get
--------------------------------------------------------------------------
An invalid physical processor ID was returned when attempting to bind
an MPI process to a unique processor.
This usually means that you requested binding to more processors than
exist (e.g., trying to bind N MPI processes to M processors, where N >
M). Double check that you have enough unique processors for all the
MPI processes that you are launching on this host.
You job will now abort.
--------------------------------------------------------------------------
Brock Palen
www.umich.edu/~brockp
CAEN Advanced Computing
brockp_at_[hidden]
(734)936-1985
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