Issue with OpenMPI in docker

[prudhomm]

when @vincentchabannes run executables in docker, all work well but he has a lot of messages like:

Read -1, expected <someNumber>, errno =1

see open-mpi/ompi#4948 for more details.
it solves the problem.

• Solution 1: add an mca parameter to mpiexec launches:

mpiexec -n 4 --mca btl ^vader feelpp_qs_laplacian_2d --checker.solution x**2+y**2 --ksp-monitor=1 --pc-type lu

• Solution 2: just export OMPI_MCA_btl_vader_single_copy_mechanism=none

Maybe we could add the env variable in feelpp-env?

[Trophime]

I would prefer solution 2.
This also means that the same env var shall be defined singularity recipes I guess

[prudhomm]

solution 2 does not work @vincentchabannes
I get tons of these:
[f58c0a4c67a1:00235] Read -1, expected 15360, errno = 1

[prudhomm]

solution 1 works

[vincentchabannes]

@prudhomm you do a mistake when you copy past the solution 2. I fixed it.

[Trophime]

@vincent do you have committed the changes? because it seems that docker images for toolboxes on ubuntu 20.04 still has: ENV OMPI_MCA_btl_btl_vader_single_copy_mechanism=none