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Description: Turn off warning that openfabric is not available
because it breaks some overlying layers/appications in Debian.
Also exclude openfabric/openib by default.
See: #979041, #1094805
Updated to allow UCX
Author: Alastair McKinstry <mckinstry@debian.org>
Last-Updated: 2025-12-05
Forwarded: not-needed
--- a/opal/etc/openmpi-mca-params.conf
+++ b/opal/etc/openmpi-mca-params.conf
@@ -57,3 +57,13 @@
# See "ompi_info --param all all --level 9" for a full listing of Open
# MPI MCA parameters available and their default values.
+
+# Silence this warning on Debian, as many systems don't have openfabric
+# but the warning breaks higher layers or application
+btl_base_warn_component_unused=0
+# Avoid openib an in case applications use fork: see https://github.com/ofiwg/libfabric/issues/6332
+# If you wish to use openib and know your application is safe, remove the following:
+# Similarly for UCX: https://github.com/open-mpi/ompi/issues/8367
+mtl = ^ofi
+btl = ^openib,ofi
+osc = ^pt2pt
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