Why Your Agent's Memory Layer Will Fail at 3 AM: HNSW Contention and Semantic Retrieval Under Load
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Why Your Agent's Memory Layer Will Fail at 3 AM: HNSW Contention and Semantic Retrieval Under Load At 3:17 AM, our agent platform started timing out. CPU looked fine. Disk I/O was quiet. The culprit was PostgreSQL's HNSW index: fifty concurrent sessions trying to insert new memories simultaneously,…
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- 2026-11-05 16:57 · DEV Community — AI
Why Your Agent's Memory Layer Will Fail at 3 AM: HNSW Contention and Semantic Retrieval Under Load