Add document for vllm paged attention kernel. #2978
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For reviewers, rendered here: https://vllm--2978.org.readthedocs.build/en/2978/dev/kernel/paged_attention.html |
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Thank you for this great write up! |
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This doc is very usefull. Hope to be merged soon. |
LiuXiaoxuanPKU
approved these changes
Mar 4, 2024
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@pian13131 This is AWESOME! Thanks for your contribution! |
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Hello, I am currently studying the vLLM paged attention kernel, and I've found that the implementation can be quite complex for newcomers. After thoroughly reviewing the primary implementation of the kernel in
csrc/attention/attention_kernels.cu, I have composed this document to provide a high-level understanding of the paged attention kernel. The document covers explanations on memory layout, read patterns, and step-by-step calculations, accompanied by diagrams and pseudo-code. It is intended to serve as a valuable reference for individuals interested in the implementation of the paged attention kernel.Given that I am still a novice in this subject, there may be some misunderstandings in the document. I welcome any comments and advice to enhance its accuracy and clarity. Your feedback is highly appreciated! Wish this document can be merged to help other people!