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[TRITON] Prevent NUM_KSPLIT from reducing K dim below GROUP_K #2661

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Merged
vgokhale merged 3 commits into from
Apr 13, 2026
Merged

[TRITON] Prevent NUM_KSPLIT from reducing K dim below GROUP_K #2661

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aad748c
Fix NUM_SPLIT
vgokhale Apr 9, 2026
a422d4e
Merge branch 'main' into vinayak/fix_a8w8_blockscale
vgokhale Apr 9, 2026
f775a57
Lint
vgokhale Apr 9, 2026
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10 changes: 10 additions & 0 deletions aiter/ops/triton/utils/gemm_config_utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -216,6 +216,16 @@ def compute_splitk_params(config: dict, K: int) -> dict:
config["SPLITK_BLOCK_SIZE"] = triton.cdiv(K, config["NUM_KSPLIT"])

if "BLOCK_SIZE_K" in config:
# If NUM_KSPLIT makes K too small, then BLOCK_K will decrease to be smaller than
# GROUP_K.
while (
config["NUM_KSPLIT"] > 1
and config["BLOCK_SIZE_K"] > config["SPLITK_BLOCK_SIZE"]
):
config["NUM_KSPLIT"] = max(config["NUM_KSPLIT"] // 2, 1)
config["SPLITK_BLOCK_SIZE"] = triton.cdiv(K, config["NUM_KSPLIT"])

# If BLOCK_SIZE_K is still too large with NUM_KSPLIT=1, fix it to equal K dim.
if config["BLOCK_SIZE_K"] > config["SPLITK_BLOCK_SIZE"]:
config["BLOCK_SIZE_K"] = triton.next_power_of_2(config["SPLITK_BLOCK_SIZE"])

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