Dear George, Dear all, I use "mpirun -np xx ./a.out"
I do not know if I have some common grounds. I mean, I have to design everything from the begging. You can find what I would like to do in the attachment. Basically, an MPI cast in another MPI. Consequently, I am thinking to MPI groups or MPI virtual topology with a 2D cart, using the columns as "groups" and the first rows as the external groups to handle the columns. What do think? What do you suggest? Really Really thanks Diego On 25 July 2017 at 19:26, George Bosilca <bosi...@icl.utk.edu> wrote: > 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 >
what2do.pdf
Description: Adobe PDF document
_______________________________________________ users mailing list users@lists.open-mpi.org https://rfd.newmexicoconsortium.org/mailman/listinfo/users
