Flashattention-3: Fast And Accurate Attention With Asynchrony And Low-precision

Shah Jay, Bikshandi Ganesh, Zhang Ying, Thakkar Vijay, Ramani Pradeep, Dao Tri. Arxiv 2024

[Paper]    
Applications Attention Mechanism Efficiency And Optimization Model Architecture Pretraining Methods Quantization RAG Reinforcement Learning Transformer

Attention, as a core layer of the ubiquitous Transformer architecture, is the bottleneck for large language models and long-context applications. FlashAttention elaborated an approach to speed up attention on GPUs through minimizing memory reads/writes. However, it has yet to take advantage of new capabilities present in recent hardware, with FlashAttention-2 achieving only 35% utilization on the H100 GPU. We develop three main techniques to speed up attention on Hopper GPUs: exploiting asynchrony of the Tensor Cores and TMA to (1) overlap overall computation and data movement via warp-specialization and (2) interleave block-wise matmul and softmax operations, and (3) block quantization and incoherent processing that leverages hardware support for FP8 low-precision. We demonstrate that our method, FlashAttention-3, achieves speedup on H100 GPUs by 1.5-2.0\(\times\) with FP16 reaching up to 740 TFLOPs/s (75% utilization), and with FP8 reaching close to 1.2 PFLOPs/s. We validate that FP8 FlashAttention-3 achieves 2.6\(\times\) lower numerical error than a baseline FP8 attention.

Similar Work