PostgreSQL 18 Async I/O: Tune for 3x Faster Reads
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Kodetra Technologies··9 min read Advanced Summary
Configure io_method, io_workers, and io_uring for big PostgreSQL read throughput gains.
Why PostgreSQL 18's Async I/O Changes Everything
PostgreSQL 18 ships the biggest read-path overhaul in over a decade. The new asynchronous I/O subsystem lets a single backend issue many disk reads in flight at once, instead of blocking on each page like every prior version. On NVMe and cloud block storage, that translates to 2-3x throughput improvements on cold sequential scans, vacuum, and analytics queries — without rewriting a single query.
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