I forgot to add that we are using 'bproc'. Launching processes on the compute
nodes using bproc works well, I'm not sure if bproc is involved when processes
are launched on the local node.
Sean
________________________________
From: users-boun...@open-mpi.org on behalf of Kelley, Sean
Sent: Mon 6/11/2007 2:07 PM
To: us...@open-mpi.org
Subject: [OMPI users] mpirun hanging when processes started on head node
Hi,
We are running the OFED 1.2rc4 distribution containing openmpi-1.2.2 on a
RedhatEL4U4 system with Scyld Clusterware 4.1. The hardware configuration
consists of a DELL 2950 as the headnode and 3 DELL 1950 blades as compute nodes
using Cisco TopSpin Infiband HCAs and switches for the interconnect.
When we use 'mpirun' from the OFED/Open MPI distribution to start
processes on the compute nodes, everything works correctly. However, when we
try to start processes on the head node, the processes appear to run correctly
but 'mpirun' hangs and does not terminate until killed. The attached 'run1.tgz'
file contains detailed information from running the following command:
mpirun --hostfile hostfile1 --np 1 --byslot --debug-daemons -d hostname
where 'hostfile1' contains the following:
-1 slots=2 max_slots=2
The 'run.log' is the output of the above line. The 'strace.out.0' is the result
of 'strace -f' on the mpirun process (and the 'hostname' child process since
mpirun simply forks the local processes). The child process (pid 23415 in this
case) runs to completion and exits successfully. The parent process (mpirun)
doesn't appear to recognize that the child has completed and hangs until killed
(with a ^c).
Additionally, when we run a set of processes which span the headnode and the
compute nodes, the processes on the head node complete successfully, but the
processes on the compute nodes do not appear to start. mpirun again appears to
hang.
Do I have a configuration error or is there a problem that I have encountered?
Thank you in advance for your assistance or suggestions
Sean
------
Sean M. Kelley
sean.kel...@solers.com
