Hello,

I've recently setup a new cluster that uses slurm for resource allocation. Upon starting a new mpi job with:
$ salloc -n 32 sh
$ mpirun -np 32 -nolocal a.out

I get the following errors:

failed to connect to the socket (sock2): {socket.gaierror, (-2, 'Name or service not known')}. Probable reason: host "node2" is invalid
(mpdboot 494): failed to connect to the socket (sock2): {socket.error, (9, 'Bad file descriptor')}. Probable reason: host "node2" is invalid

totalnum=3 numhosts=2
there are not enough hosts on which to start all processes

I then checked to see if slurm nodelist is set properly with:
$ echo $SLURM_NODELIST
node[01-02]
and to confirm its intel mpi:
$ which mpirun
/opt/intel/impi/4.0.0.028/intel64/bin/mpirun

The nodes below 10 have a leading zero in their hostname. It looks like mpirun is dropping this leading zero in the hostname.

Am I missing something really simple and there is a straightforward fix?