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Draft: Add FlashAttention online merge in Unified Attention #785

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Merged
adobrzyn merged 11 commits into from
Jan 28, 2026
+679 −117
Merged

Draft: Add FlashAttention online merge in Unified Attention #785

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689431e
Handle spec decode optionals in unified batch
kzawora-intel Jan 7, 2026
0068dd0
[WIP] Chunked Shared Attention with Dense Biases
kzawora-intel Jan 7, 2026
b4751ce
cleanup
kzawora-intel Jan 7, 2026
1f0f17a
remove FA changes
kzawora-intel Jan 7, 2026
019a1cf
pad shared blocks to chunk size
kzawora-intel Jan 7, 2026
2d708e4
Add FA online merge to UA
kzawora-intel Jan 7, 2026
ef3c73f
Unified Attention - multi-step low-level profiling
kzawora-intel Jan 8, 2026
26cfc38
Merge remote-tracking branch 'origin' into origin/main
kzawora-intel Jan 14, 2026
527304e
cleanup flags + add graph splitting
kzawora-intel Jan 14, 2026
8a5eac0
reduce chunk size, fix mla
kzawora-intel Jan 14, 2026
cde69c4
Merge branch 'main' into private/kzawora/fa_online_merge
adobrzyn Jan 22, 2026
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1 change: 1 addition & 0 deletions vllm_gaudi/extension/features.py
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Original file line number Diff line number Diff line change
Expand Up @@ -90,6 +90,7 @@ def get_features():
Value('dynamic_shapes_compilation', True, env_var='VLLM_T_COMPILE_DYNAMIC_SHAPES', env_var_type=boolean),
Value('fullgraph_compilation', False, env_var='VLLM_T_COMPILE_FULLGRAPH', env_var_type=boolean),
Value('unified_attn', False),
Value('unified_attn_dense_shared_bias', True),
Value('unified_attn_softmax_fa2',
All(VersionRange(">=1.24.0.279"), Enabled('unified_attn'), Kernel(softmax_fa2), Hardware('gaudi3'))),
Value('scale_adjustment', True, env_var='VLLM_SCALE_ADJUSTMENT', env_var_type=boolean),
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