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Why AXPY? about powerinfer HOT 2 CLOSED

richardweii avatar richardweii commented on June 11, 2024
Why AXPY?

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YixinSong-e avatar YixinSong-e commented on June 11, 2024

这是考虑到了神经元的激活在下投影层是按列的,导致了下投影层加载时的不连续性,decoding阶段LLM推理是memory bandwidth bound的,实现思路就是尽可能保证连续的load,并且跳过不必要的memory access。尽管GPU上shared memory是可以从HBM先不连续的load进来再进行计算,但是CPU上的cache没办法显式控制,AXPY可以保证CPU/GPU都能做到连续的memory access,因此设计了AXPY。

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richardweii avatar richardweii commented on June 11, 2024

很好的设计思路,非常感谢解答!

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