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Bug fix and optimisation for persistent reduction kernel tuning #2596

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Merged
merged 1 commit into from
Sep 4, 2025
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Bug fix and optimisation for persistent reduction kernel tuning #2596

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28 changes: 14 additions & 14 deletions torch/_inductor/runtime/triton_heuristics.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2595,20 +2595,20 @@ def _persistent_reduction_configs(
elif reduction_hint == ReductionHint.OUTER:
configs = configs[-1:]

if reduction_hint == ReductionHint.OUTER_TINY:
tiny_configs = [
triton_config_reduction(
size_hints,
2 * (256 // rnumel) if rnumel <= 256 else 1,
rnumel,
)
]
if max_autotune_enabled:
for tconfig in tiny_configs:
if tconfig not in configs:
configs.append(tconfig)
else:
configs = tiny_configs
tiny_configs = [
triton_config_reduction(
size_hints,
2 * (256 // rnumel) if rnumel <= 256 else 1,
rnumel,
)
]

if max_autotune_enabled:
for conf in tiny_configs:
if conf not in configs:
configs.append(conf)
elif reduction_hint == ReductionHint.OUTER_TINY:
configs = tiny_configs

for c in configs:
# we don't need Rn_BLOCK for persistent reduction
Expand Down