> 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 > > _______________________________________________ > devel mailing list > devel@lists.open-mpi.org > https://rfd.newmexicoconsortium.org/mailman/listinfo/devel _______________________________________________ devel mailing list devel@lists.open-mpi.org https://rfd.newmexicoconsortium.org/mailman/listinfo/devel
