Hi Ralph,
OK, that's pretty much what I thought but wanted to get a sanity check. :-)
I'll see if I can reproduce the issue in a more precise manner and open an
issue if I find something off in the mapping.
Thanks,
--tjn
_________________________________________________________________________
Thomas Naughton naught...@ornl.gov
Research Associate (865) 576-4184
On Fri, 24 Feb 2017, r...@open-mpi.org wrote:
On Feb 24, 2017, at 11:57 AM, Thomas Naughton <naught...@ornl.gov> wrote:
Hi,
We're trying to track down some curious behavior and decided to take a step
back and check a base assumption.
When running within a managed environment (job allocation):
Q: Should you be able to use `--hostfile` or `--host` options to
operate on a subset of the resources in the allocation?
(Example: within 4 node SLURM allocation, run on just 2 nodes in
allocation.)
Yes - those options are used to “filter” the allocation prior to launch
Q: Additionally, should this be the same when launching the DVM in
order to run on a subset of resources using subsequent
'mpirun --hnp ...' commands?
(Only 'orte-dvm' would need to have `--hostfile` or `--host` args.)
Yes - only the DVM needs to know the filter. When operating with a DVM, “mpirun
--hnp...” only packages up the cmd line and sends it to the DVM. All the
mapping occurs in orte-dvm.
There are a variety of interactions with ess/ras/rmaps and the resource
manager, but the thought was that you "should" be able to use a hostfile to
operate on a subset of the allocation. Is that a flawed assumption?
Thanks,
--tjn
_________________________________________________________________________
Thomas Naughton naught...@ornl.gov
Research Associate (865) 576-4184
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