Mellanox told me that the MTT &hostlist() funclet is returning a comma-
delimited list of hosts (and &hostlist_hosts()). That is fine for
Open MPI, but it is not for MVAPICH -- MVAPICH requires a space-
delimited list of hosts for their mpirun.
Here's a patch that introduces an optional parameter to &hostlist()
and &hostlist_hosts(). The optional parameter is a delimiter for the
hostlist. So if you call:
you'll get the same comma-delimited list that is returned today. But
if you call
you should get a space-delimited list.
Can Mellanox try this patch and see if it works for them? If so, I'll
commit it to the MTT trunk.