Gilles,
thanks again. Adding '--mca btl_vader_single_copy_mechanism none' helps
indeed.
The default seems to be 'cma' and that seems to use process_vm_readv()
and process_vm_writev(). That seems to require CAP_SYS_PTRACE, but
telling Podman to give the process CAP_SYS_PTRACE with '--cap-add=SYS_P
Adrian,
Can you try
mpirun --mca btl_vader_copy_mechanism none ...
Please double check the MCA parameter name, I am AFK
IIRC, the default copy mechanism used by vader directly accesses the remote
process address space, and this requires some permission (ptrace?) that might
be dropped by podman
So upstream Podman was really fast and merged a PR which makes my
wrapper unnecessary:
Add support for --env-host : https://github.com/containers/libpod/pull/3557
As commented in the PR I can now start mpirun with Podman without a
wrapper:
$ mpirun --hostfile ~/hosts --mca orte_tmpdir_base /tmp
