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[BOO] Limit threads used for numeric verification #1346

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[BOO] Limit threads used for numeric verification #1346

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14 changes: 12 additions & 2 deletions iree/turbine/kernel/boo/driver/numerics.py
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Original file line number Diff line number Diff line change
Expand Up @@ -103,8 +103,18 @@ def compute_cpu_reference(

reference_module = sig.get_nn_module(use_custom=False)

with torch.no_grad():
result = reference_module(*ref_args)
# This function exists for correctness, not performance. Restrict BLAS
# to a single thread so that OpenBLAS (or MKL) does not try to spawn as
# many threads as there are CPU cores. On machines with >128 cores that
# exceeds OpenBLAS's compiled-in limit and segfaults.
# See https://github.com/iree-org/iree-turbine/issues/1336
prev_threads = torch.get_num_threads()
torch.set_num_threads(1)
try:
with torch.no_grad():
result = reference_module(*ref_args)
finally:
torch.set_num_threads(prev_threads)

# Wrap single tensor in tuple
if isinstance(result, torch.Tensor):
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