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llama-server: Avoids extra copying of existing checkpoints - #30683
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sarahwu185 wants to merge 2 commits into
Open
sarahwu185 wants to merge 2 commits into
sarahwu185 wants to merge 2 commits into
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Overview
If an existing checkpoint already exist, reuse it instead of copying the state again.
Additional information
Will have merge conflicts with #30137
Profiling
Same long system prompt with a different user message per request vs. a growing multi-turn chat. Median GPU prompt time per request, RTX PRO 6000 Blackwell.
Multi-turn chat benefits only when the next request goes back to a position that already has a checkpoint. lev restored a checkpoint on every turn, and all 48 re-copies became reuses. Qwen3.6 and Gemma just extended the cached prompt, so there was nothing to reuse.
Requirements
Yes