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From: bertrand HARTWIG <[email protected]>
To: ek ek <[email protected]>
Cc: Pgsql-admin <[email protected]>
Subject: Re: About asynchronous I/O
Date: Tue, 23 Jun 2026 13:25:58 +0200
Message-ID: <[email protected]> (raw)
In-Reply-To: <CALAkhNX_6OttLJa7X+0wA7vx+wVCUMHjNcgg+2fjw=_Z3CXTKg@mail.gmail.com>
References: <CALAkhNX_6OttLJa7X+0wA7vx+wVCUMHjNcgg+2fjw=_Z3CXTKg@mail.gmail.com>

Hello,

The size of the database is clearly not important.

What matters are queries that are not already cached and that perform I/O.

With async I/O, you can see I/O performance improvements of up to 200%–300%. The higher the disk latency, the greater the gains you will notice.

Regards,

Bertrand


> Le 23 juin 2026 à 09:55, ek ek <[email protected]> a écrit :
> 
> Hello everyone,
> Are any of you running PostgreSQL 18 on production environments sized between 1 to 3TB? Does the 'asynchronous I/O (AIO) subsystem' deliver a significant performance increase? Also, has anyone had the opportunity to benchmark it against v17?

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