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On size10 clusters, the bundled Postgres accepts 500 connections instead of 300 - #3141
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Benjamin Elder (BenTheElder) merged 1 commit intoOct 23, 2026
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At 300, eight ate-api-server replicas fit only about 30 pool connections each. In the 8 x 8 CPU cold resume benchmark, pools of 30 capped the ceiling at about 6500 cycles/s. Pools of 55, which need 488 connections, reached about 7350, and larger pools added nothing. The comment now counts the owner pool in each replica's connections.
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spoke to Eitan Yarmush (@EItanya), we're both OK with this.
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size10's
max_connections = 300limits how many ate-api-server replicas can run with a useful pool. Each replica holds its read/write pool plus 6 owner, watch and readiness connections, so eight replicas fit only about 30 pool connections each.In the cold resume benchmark on the fake data plane (8 replicas at 8 CPUs, size10 Postgres), pool size set the ceiling:
AI use: AI-assisted (Claude Code) for the benchmark runs, the analysis and this change.