When running your comm_spawn code, did you remove the Info key code? You wouldn't need to provide a hostfile or hosts any more, which is why it should resolve that problem.
I agree that providing either hostfile or host as an Info key will cause the program to segfault - I'm woking on that issue. On Tue, Feb 3, 2015 at 3:46 PM, Evan Samanas <evan.sama...@gmail.com> wrote: > Setting these environment variables did indeed change the way mpirun maps > things, and I didn't have to specify a hostfile. However, setting these > for my MPI_Comm_spawn code still resulted in the same segmentation fault. > > Evan > > On Tue, Feb 3, 2015 at 10:09 AM, Ralph Castain <r...@open-mpi.org> wrote: > >> If you add the following to your environment, you should run on multiple >> nodes: >> >> OMPI_MCA_rmaps_base_mapping_policy=node >> OMPI_MCA_orte_default_hostfile=<your hostfile> >> >> The first tells OMPI to map-by node. The second passes in your default >> hostfile so you don't need to specify it as an Info key. >> >> HTH >> Ralph >> >> >> On Tue, Feb 3, 2015 at 9:23 AM, Evan Samanas <evan.sama...@gmail.com> >> wrote: >> >>> Hi Ralph, >>> >>> Good to know you've reproduced it. I was experiencing this using both >>> the hostfile and host key. A simple comm_spawn was working for me as well, >>> but it was only launching locally, and I'm pretty sure each node only has 4 >>> slots given past behavior (the mpirun -np 8 example I gave in my first >>> email launches on both hosts). Is there a way to specify the hosts I want >>> to launch on without the hostfile or host key so I can test remote launch? >>> >>> And to the "hostname" response...no wonder it was hanging! I just >>> constructed that as a basic example. In my real use I'm launching >>> something that calls MPI_Init. >>> >>> Evan >>> >>> >>> >>> _______________________________________________ >>> users mailing list >>> us...@open-mpi.org >>> Subscription: http://www.open-mpi.org/mailman/listinfo.cgi/users >>> Link to this post: >>> http://www.open-mpi.org/community/lists/users/2015/02/26271.php >>> >> >> >> _______________________________________________ >> users mailing list >> us...@open-mpi.org >> Subscription: http://www.open-mpi.org/mailman/listinfo.cgi/users >> Link to this post: >> http://www.open-mpi.org/community/lists/users/2015/02/26272.php >> > > > _______________________________________________ > users mailing list > us...@open-mpi.org > Subscription: http://www.open-mpi.org/mailman/listinfo.cgi/users > Link to this post: > http://www.open-mpi.org/community/lists/users/2015/02/26281.php >
