Add -rank-by node to your cmd line. You’ll still get 4 procs/node, but they will be ranked by node instead of consecutively within a node.
> On Mar 25, 2016, at 9:30 AM, Ronald Cohen <recoh...@gmail.com> wrote: > > I am using > > mpirun --map-by ppr:4:node -n 16 > > and this loads the processes in round robin fashion. This seems to be > twice as slow for my code as loading them node by node, 4 processes > per node. > > How can I not load them round robin, but node by node? > > Thanks! > > Ron > > > --- > Ron Cohen > recoh...@gmail.com > skypename: ronaldcohen > twitter: @recohen3 > > --- > Ronald Cohen > Geophysical Laboratory > Carnegie Institution > 5251 Broad Branch Rd., N.W. > Washington, D.C. 20015 > _______________________________________________ > 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/2016/03/28828.php
