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On RDNA, attention is not enabled by default. It will use GEMM + scale + softmax + gemm OPs without any fusion. Enable attention let above OP fused, and can signifcantly improve performance.
klin2024
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Motivation
On RDNA, MLIR attention is not enabled by default, causing attention to be computed as separate unfused ops: GEMM → scale → softmax → GEMM.
Technical Details
Enabling MLIR attention fuses the above ops into a single kernel for RDNA gfx10/11, which can significantly improve performance.
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CHANGELOG.mdentry for any option other thanNot Applicable