Source: openmpi Version: 5.0.6-3 Dear Maintainer,
UCX is disabled in /etc/openmpi/openmpi-mca-params.conf by no-warning-unused.patch: https://sources.debian.org/src/openmpi/5.0.6-3/debian/patches/no-warning-unused.patch/ with the motivation to silence warnings when RDMA devices are not available: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=980033 https://github.com/open-mpi/ompi/issues/8367 Could UCX be re-enabled? I believe recent versions should no longer produce these messages. Re-enabling would also restore OpenMPI's default behavior of selecting UCX for Infiniband-enabled systems. At the moment, OpenMPI is falling back to ob1 for Infiniband communication, which has been significantly less performant in our testing. To enable UCX, we're adjusting /etc/openmpi/openmpi-mca-params.conf from: mtl = ^ofi btl = ^uct,openib,ofi pml = ^ucx osc = ^ucx,pt2pt to: mtl = ^ofi btl = ^openib,ofi osc = ^pt2pt I couldn't comment on openfabric/openib. -- System Information: Debian Release: trixie/sid APT prefers testing APT policy: (500, 'testing') Architecture: amd64 (x86_64) Kernel: Linux 6.11.7-amd64 (SMP w/4 CPU threads; PREEMPT) Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8), LANGUAGE=en_GB:en Shell: /bin/sh linked to /usr/bin/dash Init: systemd (via /run/systemd/system) LSM: AppArmor: enabled
