Hi Ralph, Afraid I don't understand. If your image has the OMPI libraries installed > in it, what difference does it make what is on your host? You'll never see > the IMPI installation. >
> We have been supporting people running that way since Singularity was > originally released, without any problems. The only time you can hit an > issue is if you try to mount the MPI libraries from the host (i.e., violate > the container boundary) - so don't do that and you should be fine. > Can you clarify what you mean here? I thought there was an ABI difference between the various MPICH-based MPIs and OpenMPI, meaning you can't use a host's Intel MPI to launch a container's OpenMPI-compiled program. You *can* use the internal-to-the-container OpenMPI to launch everything, which is easy for single-node runs but more challenging for multi-node ones. Maybe my understanding is wrong or out of date though? Thanks, - Brian > > > On Jan 26, 2022, at 12:19 PM, Luis Alfredo Pires Barbosa < > luis_pire...@hotmail.com> wrote: > > Hi Ralph, > > My singularity image has OpenMPI, but my host doesnt (Intel MPI). And I am > not sure if I the system would work with Intel + OpenMPI. > > Luis > > Enviado do Email <https://go.microsoft.com/fwlink/?LinkId=550986> > para Windows > > *De: *Ralph Castain via users <users@lists.open-mpi.org> > *Enviado:*quarta-feira, 26 de janeiro de 2022 16:01 > *Para: *Open MPI Users <users@lists.open-mpi.org> > *Cc:*Ralph Castain <r...@open-mpi.org> > *Assunto: *Re: [OMPI users] OpenMPI - Intel MPI > > Err...the whole point of a container is to put all the library > dependencies _inside_ it. So why don't you just install OMPI in your > singularity image? > > > > On Jan 26, 2022, at 6:42 AM, Luis Alfredo Pires Barbosa via users < > users@lists.open-mpi.org> wrote: > > Hello all, > > I have Intel MPI in my cluster but I am running singularity image of a > software which uses OpenMPI. > > Since they may not be compatible and I dont think it is possible to get > these two different MPI running in the system. > I wounder if there is some work arround for this issue. > > Any insight would be welcome. > Luis > > >
