Add page attention manager and kvcache manager #167
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FanhaiLu1
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qihqi,
wang2yn84,
lsy323,
sixiang-google and
bhavya01
qihqi
approved these changes
Aug 6, 2024
| page_size: int, | ||
| max_pages_per_sequence: int, | ||
| ): | ||
| self.unused_pages = queue.Queue() |
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Current jet stream implementation's detokenize_threads and _generate_threads are different thread, both of them need to access this queue. So the queue should be thread safe, but deque is not thread safe.
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This PR adds two classes, fundamental for page attention in JetStream:
PageAttentionManager:
This class manages and frees page resources, calculates page metadata, and supports cache insertion.
PageKVCacheGenerate:
This class updates decode caches in a page-attention format. Unlike the standard LLM KV cache shape ([batch_size, num_heads, seq_len, head_dim]), PageKVCache uses the shape [num_heads, total_num_pages, page_size, head_dim].