Unverified50% confidenceFactExact time
The hnswlib documentation states that a higher ef makes search more accurate and slower, and that it cannot be less than k; this description can basically be carried over to understanding pgvector's hnsw.ef_search.
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10/17/2026
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Related Claims
UnverifiedFull-text search typically relies on inverted index technology to achieve millisecond-level retrieval response.65% similarUnverifiedDuring HNSW queries, the upper-layer search uses ef = 1, keeping only one candidate and performing pure greedy descent; the bottom layer uses a beam search of size ef.64% similarUnverifiedSemantica节点搜索的性能提升来自底层索引的重写，而非硬件堆砌62% similar
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