kernel asynchronous reads in PostgreSQL 19 (io_uring)
Summary
The article explains how PostgreSQL 19 can use kernel-driven asynchronous I/O via io_uring, comparing it with the io_worker path and detailing configuration, tracing, and execution plan observations. It highlights that io_uring enables more in-flight I/O and reduces waiting, while illustrating the ongoing impact of storage bottlenecks and the importance of monitoring and tuning IO submission/completion behavior.