Subj : Fitti: Waiting for Postgres 18: Accelerating Disk Reads with Asynchrono
To   : All
From : LWN.net
Date : Thu May 08 2025 06:40:08

Lukas Fitti writes in detail
on the pganalyze blog about the asynchronous I/O capability coming with the
PostgreSQL˙18 release.

Asynchronous I/O delivers the most noticeable gains in cloud
	environments where storage is network-attached, such as Amazon EBS
	volumes. In these setups, individual disk reads often take multiple
	milliseconds, introducing substantial latency compared to local
	SSDs.

With traditional synchronous I/O, each of these reads blocks query
	execution until the data arrives, leading to idle CPU time and
	degraded throughput. By contrast, asynchronous I/O allows Postgres
	to issue multiple read requests in parallel and continue processing
	while waiting for results. This reduces query latency and enables
	much more efficient use of available I/O bandwidth and CPU cycles.

https://lwn.net/Articles/1020452/
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