Mpiexec runs 1 process only

[Danny Sternkopf]

Hi,

I'am just testing the mpiexec program due to the handicap of PBS.
On my machine is PBSPro 5.4.1 and MPICH 1.2.5.2 installed.

I could compile the mpiexec code without problems.
Now I want to run a two CPU job, but mpiexec starts always
one process only. Here the example:

asama.ess.nec.de:~/mpiexec-0.76 2910> qsub -lnodes=1:ppn=2 -I -N"test_mpiexec"
qsub: waiting for job 227.asama to start
qsub: job 227.asama ready

18:24:43
asama.ess.nec.de:~/mpiexec-0.76 2909> ./mpiexec -nostdout -nostdin -comm shmem ./hello
hello from 0/1 hostname asama.ess.nec.de pid 16724 with 0 args:

I saw in the source code that tasks which have the same node and same config but
possibly different cpu# will be squeezed together.

Why does mpiexec do that?
Sorry, but I'am not so familiar with MPI.

What could be the reason for the above problem?

Best regards,

Danny