Adrian,
the MPI application relies on some environment variables (they typically
start with OMPI_ and PMIX_).
The MPI application internally uses a PMIx client that must be able to
contact a PMIx server
(that is included in mpirun and the orted daemon(s) spawned on the
remote hosts).
located on the same host.
If podman provides some isolation between the app inside the container
(e.g. /home/mpi/hello)
and the outside world (e.g. mpirun/orted), that won't be an easy ride.
Cheers,
Gilles
On 7/11/2019 4:35 PM, Adrian Reber via users wrote:
I did a quick test to see if I can use Podman in combination with Open
MPI:
[test@test1 ~]$ mpirun --hostfile ~/hosts podman run
quay.io/adrianreber/mpi-test /home/mpi/hello
Hello, world (1 procs total)
--> Process # 0 of 1 is alive. ->789b8fb622ef
Hello, world (1 procs total)
--> Process # 0 of 1 is alive. ->749eb4e1c01a
The test program (hello) is taken from
https://raw.githubusercontent.com/openhpc/ohpc/obs/OpenHPC_1.3.8_Factory/tests/mpi/hello.c
The problem with this is that each process thinks it is process 0 of 1
instead of
Hello, world (2 procs total)
--> Process # 1 of 2 is alive. ->test1
--> Process # 0 of 2 is alive. ->test2
My questions is how is the rank determined? What resources do I need to have
in my container to correctly determine the rank.
This is Podman 1.4.2 and Open MPI 4.0.1.
Adrian
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