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ci: add --bind-to none to Phoenix syscheck smoke-test (fixes GPU-node MPI bind failure) #1834

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sbryngelson merged 1 commit into from
Sep 8, 2026
+8 −1
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ci: add --bind-to none to Phoenix syscheck smoke-test (fixes GPU-node MPI bind failure) #1834

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9 changes: 8 additions & 1 deletion .github/workflows/common/build.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -41,9 +41,16 @@ source .github/scripts/retry-build.sh
# aborts in MPI_Init ("OPAL ERROR: Unreachable in file ext3x_client.c"). mpirun
# is unaffected, and it is how MFC launches every binary anyway. Output is left
# on stdout so a future failure is diagnosable from the CI log.
#
# --bind-to none is required, not cosmetic: on a busy GPU node SLURM hands the job
# an offset/partial cpuset (e.g. cores 32-47), and Open MPI's default --bind-to
# core then dies with "hwloc_set_cpubind Error for bitmap" before the binary even
# starts. The run templates, coverage_build.py and preflight.sh all already pass
# it; this smoke-test was the lone launch that did not, and it red-crossed jobs
# that backfilled onto shared GPU nodes.
validate_cmd=""
if [ "$job_cluster" = "phoenix" ]; then
validate_cmd='syscheck_bin=$(find build/install -name syscheck -type f 2>/dev/null | head -1); [ -z "$syscheck_bin" ] || mpirun -np 1 "$syscheck_bin"'
validate_cmd='syscheck_bin=$(find build/install -name syscheck -type f 2>/dev/null | head -1); [ -z "$syscheck_bin" ] || mpirun --bind-to none -np 1 "$syscheck_bin"'
fi

# --- Variant selection ---
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