Re: AIO v2.5

Hi,

On 2025-04-23 00:38:01 +0200, Tomas Vondra wrote:
> There's an open item related to this commit (247ce06b883d), based on:

Oops, forgot to reply.

> For now the default io_method is changed to "worker". We should re-
> evaluate that around beta1, we might want to be careful and set the
> default to "sync" for 18.
>
> FWIW the open item is in the "recheck mid-beta" section, but the commit
> message says "around beta1" which is not that far away (especially if we
> choose to do beta1 on May 8, with the minor releases).

I think we certainly should wait for at least beta1 (not that we have a choice
now), to make sure all of this gets at least some coverage.

> What information we need to gather to make the decision and who's
> expected to do it? I assume someone needs to do run some benchmarks, but
> is anyone working on it already? What benchmarks, what platforms?

I guess I'd say "the community". I think it should depend on how many problems
we find, be it correctness or performance regressions. I don't know how to
make that call without seeing how things are going during beta.

And yes, I think this should involve some benchmarking too - generally a good
thing to do during beta, and if it involves AIO, all the better.

> FWIW I'm asking because of the RMT, but I'm also willing to do some of
> the tests, if needed - but it'd be good to get some guidance.

More testing would be welcome!

Greetings,

Andres Freund