Re: Potential "AIO / io workers" inter-worker locking issue in PG18?

From: Andres Freund <andres(at)anarazel(dot)de>
To: Marco Boeringa <marco(at)boeringa(dot)demon(dot)nl>
Cc: pgsql-bugs(at)lists(dot)postgresql(dot)org
Subject: Re: Potential "AIO / io workers" inter-worker locking issue in PG18?
Date: 2025-10-06 17:09:11
Message-ID: ejoxihz4lplccwtdaglumsgzayxje25wfbpi4fitfzhmuhziuo@hcvqb3tgjmub
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Hi,

On 2025-10-06 19:01:37 +0200, Marco Boeringa wrote:
> Thanks for the suggestion, this seems a useful option.
>
> However, when I attempt to run "perf top" in a Terminal window, I get the
> following warning:
>
> WARNING: perf not found for kernel 6.14.0-1012
>
> I also see a suggestion to install the Azure linux-tools. However, if I type
> 'linux-tools' as search keyword in Synaptic Package Manager, I see a whole
> bunch of 'linux-tools', e.g. azure/aws/gcp/gke, which also include kernel
> version build numbers (at least that is what I assume they are).
>
> What version do you suggest I install for an ordinary locally running Ubuntu
> 24.04 VM?

There are meta-packages to install linux-tools for the right
version. E.g. linux-tools-virtual. Unfortunately ubuntu has multiple "kernel
variants" (like -virtual) that you still have to choose between.

You can figure out which base kernel you have with "dpkg -l|grep linux" or
such.

Greetings,

Andres

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