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server : create context checkpoint on slot restore #24956

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server : create context checkpoint on slot restore #24956

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10 changes: 10 additions & 0 deletions tools/server/server-context.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2597,6 +2597,16 @@ struct server_context_impl {
slot->prompt.tokens.clear();
slot->prompt.tokens.insert(tokens);

// A restored slot has no context checkpoint, so the next
// request with cache_prompt finds no reuse anchor and
// reprocesses the entire restored prefix. Create a
// checkpoint spanning the restored span so the restored
// KV is actually reused.
if (params_base.n_ctx_checkpoints > 0) {
create_checkpoint(*slot, (int64_t) 0, 0,
(llama_pos) (token_count > 0 ? token_count - 1 : 0));
}

const int64_t t_end = ggml_time_us();
const double t_restore_ms = (t_end - t_start) / 1000.0;

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