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server : evict checkpoints within min-step of each other (#25472)

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This commit is contained in:
Aldehir Rojas
2026-07-12 15:59:14 -05:00
committed by GitHub
parent 6b4dc2116a
commit 0c4fa7a989
2 changed files with 27 additions and 1 deletions
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tools/server/server-context.cpp
+24 -1
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@@ -2290,6 +2290,24 @@ private:
// n_tokens_cur: the number of tokens added to the batch for the current slot
void create_checkpoint(server_slot & slot, const int64_t n_tokens_cur, llama_pos pos_min, llama_pos pos_max) {
const int id_task = slot.task->id;
// evict checkpoints within min-step of a previous checkpoint, unless they were
// created by the current task
int64_t last = -1;
for (auto it = slot.prompt.checkpoints.begin(); it != slot.prompt.checkpoints.end(); ) {
if (it->id_task != id_task && last >= 0 && it->n_tokens <= last + params_base.checkpoint_min_step) {
SLT_TRC(slot, "erasing context checkpoint too close to an earlier one (pos_min = %d, pos_max = %d, n_tokens = %" PRId64 ", size = %.3f MiB)\n",
it->pos_min, it->pos_max, it->n_tokens, (float) it->size() / 1024 / 1024);
it = slot.prompt.checkpoints.erase(it);
continue;
}
last = it->n_tokens;
++it;
}
while (slot.prompt.checkpoints.size() >= (size_t) params_base.n_ctx_checkpoints) {
// make room for the new checkpoint, if needed
const auto & cur = slot.prompt.checkpoints.front();
@@ -2302,6 +2320,8 @@ private:
auto & cur = slot.prompt.checkpoints.emplace_back();
cur.id_task = id_task;
// [TAG_CHECKPOINTS_FIX_POS_MIN]
// TODO: here we incorrectly deterimne that the saved checkpoint data covers the [pos_min, pos_max] range
// this is not true for SWA models: https://github.com/ggml-org/llama.cpp/pull/24411#issuecomment-4677983225
@@ -3511,7 +3531,10 @@ private:
do_checkpoint = do_checkpoint && !has_mtmd;
// no need to create checkpoints that are too close together, unless it's the last user message
do_checkpoint = do_checkpoint && (slot.prompt.checkpoints.empty() || is_last_user_message || n_tokens_start > slot.prompt.checkpoints.back().n_tokens + params_base.checkpoint_min_step);
do_checkpoint = do_checkpoint && (
slot.prompt.checkpoints.empty() ||
is_last_user_message || near_prompt_end ||
n_tokens_start > slot.prompt.checkpoints.back().n_tokens + params_base.checkpoint_min_step);
SLT_DBG(slot, "main/do_checkpoint = %s, pos_min = %d, pos_max = %d\n", do_checkpoint ? "yes" : "no", pos_min, pos_max);
// note: we create the checkpoint before calling llama_decode(), so the current batch is not