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enhance: expr: only prefetch chunks once (#45554)

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issue: https://github.com/milvus-io/milvus/issues/43611

Signed-off-by: Shawn Wang <shawn.wang@zilliz.com>
This commit is contained in:
sparknack 2025-11-18 15:51:41 +08:00 committed by GitHub
parent 7708abd8fe
commit 16acf8829b
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1 changed files with 10 additions and 5 deletions
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15
internal/core/src/exec/expression/Expr.h
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@ -788,12 +788,15 @@ class SegmentExpr : public Expr {
size_t start_chunk = process_all_chunks ? 0 : current_data_chunk_;
// prefetch chunks to reduce cache miss latency
std::vector<int64_t> pf_chunk_ids;
pf_chunk_ids.reserve(num_data_chunk_ - start_chunk);
for (size_t i = start_chunk; i < num_data_chunk_; i++) {
pf_chunk_ids.push_back(i);
if (!prefetched_) {
std::vector<int64_t> pf_chunk_ids;
pf_chunk_ids.reserve(num_data_chunk_ - start_chunk);
for (size_t i = start_chunk; i < num_data_chunk_; i++) {
pf_chunk_ids.push_back(i);
}
segment_->prefetch_chunks(op_ctx_, field_id_, pf_chunk_ids);
prefetched_ = true;
}
segment_->prefetch_chunks(op_ctx_, field_id_, pf_chunk_ids);
for (size_t i = start_chunk; i < num_data_chunk_; i++) {
auto data_pos =
@ -1484,6 +1487,8 @@ class SegmentExpr : public Expr {
// sometimes need to skip index and using raw data
// default true means use index as much as possible
bool use_index_{true};
// used for reducing cache miss latency in tiered storage
bool prefetched_{false};
std::vector<PinWrapper<const index::IndexBase*>> pinned_index_{};
int64_t active_count_{0};