On Wed, Sep 12, 2012 at 10:23 AM, Ralph Castain <r...@open-mpi.org> wrote: > > On Sep 12, 2012, at 9:55 AM, Brian Budge <brian.bu...@gmail.com> wrote: > >> On Wed, Aug 17, 2011 at 12:05 AM, Simone Pellegrini >> <spellegr...@dps.uibk.ac.at> wrote: >>> On 08/16/2011 11:15 PM, Ralph Castain wrote: >>>> >>>> I'm not finding a bug - the code looks clean. If I send you a patch, could >>>> you apply it, rebuild, and send me the resulting debug output? >>> >>> yes, I could do that. No problem. >>> >>> thanks again, Simone >> >> Hi all - >> >> Did this ever get resolved? > > Not sure to what you are referring - this thread ran all over the place, and > I confess I've lost track. > >> I've been having trouble specifying the >> hosts to run my spawned processes on. Is there an example of how to >> do this? > > Did you look at "man MPI_Comm_spawn"? It lists all the info keys we recognize > and what they do > >> Also, I'm assuming that any host given must also be listed >> in the hostfile? > > Not in the updated 1.6 branch and above - to include the upcoming 1.6.2 > release. >
Hi Ralph - I'm using a nightly build of 1.6.2. I have tried the following: * Run the master process as a singleton OR via mpirun without setting any host information via env or command line Set the MPI_Info "host" key to the comma delimited list of hosts Launch the processes via MPI_Comm_spawn Result: All processes run on the same node that runs the singleton. * Run the master process as a singleton OR via mpirun without setting any host information via env or command line Set the MPI_Info "host" key to an individual host for each info in an array of info objects Launch the processes via MPI_Comm_spawn_multiple Result: "There are no allocated resources for the application ./driver that match the requested mapping: Verify that you have mapped the allocated resources properly using the --host or --hostfile specification" If I set the hostfile via environment variable, or if I run with mpirun and set the hostfile via the command line, everything works as expected. Is there something additional to the MPI_Info key "host" that needs to be set? Thanks, Brian
