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server : dynamic token limit for prompt cache #16560

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Merged
merged 2 commits into from
Oct 14, 2025
+13 −5
Merged

server : dynamic token limit for prompt cache #16560

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07d6954
server : dynamic token limit for prompt cache
ggerganov Oct 13, 2025
63924a9
cont : print estimated token limit
ggerganov Oct 13, 2025
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18 changes: 13 additions & 5 deletions tools/server/server.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1585,23 +1585,31 @@ struct server_prompt_cache {
}
}

// average size per token
const float size_per_token = std::max<float>(1.0f, float(size()) / (std::max<size_t>(1, n_tokens())));

// dynamically increase the token limit if it can fit in the memory limit
const size_t limit_tokens_cur = limit_size > 0 ? std::max<size_t>(limit_tokens, limit_size/size_per_token) : limit_tokens;

if (limit_tokens > 0) {
while (states.size() > 1 && n_tokens() > limit_tokens) {
while (states.size() > 1 && n_tokens() > limit_tokens_cur) {
if (states.empty()) {
break;
}

SRV_WRN(" - cache token limit reached, removing oldest entry (size = %.3f MiB)\n", states.front().size() / (1024.0 * 1024.0));
SRV_WRN(" - cache token limit (%zu, est: %zu) reached, removing oldest entry (size = %.3f MiB)\n",
limit_tokens, limit_tokens_cur, states.front().size() / (1024.0 * 1024.0));

states.pop_front();
}
}

SRV_WRN(" - cache state: %zu prompts, %.3f MiB (limits: %.3f MiB, %zu tokens)\n",
states.size(), size() / (1024.0 * 1024.0), limit_size / (1024.0 * 1024.0), limit_tokens);
SRV_WRN(" - cache state: %zu prompts, %.3f MiB (limits: %.3f MiB, %zu tokens, %zu est)\n",
states.size(), size() / (1024.0 * 1024.0), limit_size / (1024.0 * 1024.0), limit_tokens, limit_tokens_cur);

for (const auto & state : states) {
SRV_WRN(" - prompt %p: %7d tokens, checkpoints: %2zu, %9.3f MiB\n", (const void *)&state, state.n_tokens(), state.checkpoints.size(), state.size() / (1024.0 * 1024.0));
SRV_WRN(" - prompt %p: %7d tokens, checkpoints: %2zu, %9.3f MiB\n",
(const void *)&state, state.n_tokens(), state.checkpoints.size(), state.size() / (1024.0 * 1024.0));
}
}
};
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