feat: Add fused attention output + residual + RMSNorm kernel#1863
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ChuanLi1101 wants to merge 2 commits intomainfrom
Open
feat: Add fused attention output + residual + RMSNorm kernel#1863ChuanLi1101 wants to merge 2 commits intomainfrom
ChuanLi1101 wants to merge 2 commits intomainfrom
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Add a new fused Triton kernel that combines: - Attention output - Residual connection (optional) - RMSNorm - Output padding (optional, for MoE) Performance benefits: - Reduces kernel launch overhead (3 kernels -> 1) - Saves memory bandwidth (no intermediate writes) - ~1.2-1.4x speedup in attention-heavy workloads New files: - aiter/ops/triton/_triton_kernels/fusions/fused_attn_output_rmsnorm.py - aiter/ops/triton/fusions/fused_attn_output_rmsnorm.py - aiter/ops/triton/configs/FUSED-ATTN_OUTPUT-RMSNORM.json - op_tests/triton_tests/fusions/test_fused_attn_output_rmsnorm.py
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| import os | ||
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| if not hasattr(_get_config, "_config_dict"): | ||
| dev = arch_info.get_arch() |
Contributor
| start = time.time() | ||
| for _ in range(100): | ||
| x = attn_output + residual | ||
| output_unfused = rmsnorm_reference(x, weight) |
Contributor
Member
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@ChuanLi1101 Please fix the Black and Ruff code style issues first |
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Summary
Add a new fused Triton kernel that combines:
Performance Benefits
Files Changed
Usage
\\python
from aiter.ops.triton.fusions import fused_attn_output_rmsnorm
Basic usage
output = fused_attn_output_rmsnorm(attn_output, weight)
With residual and padding
output, residual = fused_attn_output_rmsnorm(
attn_output, weight,
residual=x,
x_pad_to_multiple=256
)
\\
Testing