Diego, Assuming you have some common grounds between the 4 initial groups (otherwise you will have to connect them via MPI_Comm_connect/MPI_Comm_accept) you can merge the 4 groups together and then use any MPI mechanism to create a partial group of leaders (such as MPI_Comm_split).
If you spawn the groups via MPI_Comm_spawn then the answer is slightly more complicated, you need to use MPI_Intercomm_create, with the spawner as the bridge between the different communicators (and then MPI_Intercomm_merge to create your intracomm). You can find a good answer on stackoverflow on this at https://stackoverflow.com/questions/24806782/mpi-merge-multiple-intercoms-into-a-single-intracomm How is your MPI environment started (single mpirun or mpi_comm_spawn) ? George. On Tue, Jul 25, 2017 at 10:44 AM, Diego Avesani <diego.aves...@gmail.com> wrote: > Dear All, > > I am studying Groups and Communicators, but before start going in detail, > I have a question about groups. > > I would like to know if is it possible to create a group of masters of the > other groups and then a intra-communication in the new group. I have spent > sometime reading different tutorial and presentation, but it is difficult, > at least for me, to understand if is it possible to create this sort of MPI > cast in another MPI. > > In the attachment you can find a pictures that summarize what I would like > to do. > > Another strategies could be use virtual topology. > > What do you think? > > I really, really, appreciate any kind of help, suggestions or link where I > can study this topics. > > Again, thanks > > Best Regards, > > Diego > > _______________________________________________ > users mailing list > users@lists.open-mpi.org > https://rfd.newmexicoconsortium.org/mailman/listinfo/users >
_______________________________________________ users mailing list users@lists.open-mpi.org https://rfd.newmexicoconsortium.org/mailman/listinfo/users
