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[FlyDSL] fp8_mqa_logits: raise the split oversubscription target to 16x CU #5682

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[FlyDSL] fp8_mqa_logits: raise the split oversubscription target to 16x CU #5682

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4 changes: 3 additions & 1 deletion aiter/ops/flydsl/fp8_mqa_logits_kernels.py
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Original file line number Diff line number Diff line change
Expand Up @@ -96,8 +96,10 @@ class _SplitPolicy:
_SPLIT_POLICIES = {
# Tuned on MI300X (304 CU) against the direct-load builder at BKV=128,
# where min_tiles_per_split=8 is 1024 KV columns.
# cu_oversub=16 rather than 4: the indexer prefill shapes leave the device
# under-filled at 4x (84% occupancy at seq_len 1024 / seq_len_kv 131072).
"gfx942": _SplitPolicy(
min_seq_len_kv=4096, min_tiles_per_split=8, cu_oversub=4, fallback_cu=304
min_seq_len_kv=4096, min_tiles_per_split=8, cu_oversub=16, fallback_cu=304
),
# Tuned on MI355X (256 CU) against the LDS-pipelined builder.
"gfx950": _SplitPolicy(
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