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Fix/preflight NUMA imbalance to mean uneven GPU distribution across nodes #554

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Fix/preflight NUMA imbalance to mean uneven GPU distribution across nodes #554

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bb976c1
Fix NUMA imbalance to mean uneven GPU distribution across nodes
alexsu52 Feb 12, 2026
fe1dce6
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alexsu52 Feb 12, 2026
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6 changes: 5 additions & 1 deletion primus/tools/preflight/gpu/gpu_topology.py
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,7 @@
from __future__ import annotations

import os
from collections import Counter
from typing import Any, Dict, List, Optional

from .gpu_probe import probe_gpus
Expand Down Expand Up @@ -109,7 +110,10 @@ def run_gpu_standard_checks(*, force_topology: bool = False) -> Dict[str, Any]:
findings.append(Finding("warn", "NUMA mapping unavailable (amd-smi not found); skipped", {}))
else:
nodes = [x.get("numa_node") for x in numa.get("gpus", []) if x.get("numa_node") is not None]
imbalance = len(set(nodes)) > 1 if nodes else False
imbalance = False
if nodes:
counts = Counter(nodes).values()
imbalance = len(set(counts)) > 1
findings.append(
Finding("info", "GPU↔NUMA mapping", {"mapping": numa.get("gpus", []), "imbalance": imbalance})
)
Expand Down