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Thread pool

ClickHouse's Thread Pool Wakes the Newest Idle Thread and Counts Events Per CPU

Oct 22, 2026 19 min read Jay Hubbert

ClickHouse’s thread pool wakes the most recently idle thread, and its counters are sharded per CPU so that counting never costs a cache-line ping-pong.

ClickhouseConcurrencyInternalsPerformanceThread pool

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