| From: | Andres Freund <andres(at)anarazel(dot)de> |
|---|---|
| To: | Peter Geoghegan <pg(at)bowt(dot)ie> |
| Cc: | Tomas Vondra <tomas(at)vondra(dot)me>, Thomas Munro <thomas(dot)munro(at)gmail(dot)com>, Nazir Bilal Yavuz <byavuz81(at)gmail(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Melanie Plageman <melanieplageman(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>, Georgios <gkokolatos(at)protonmail(dot)com>, Konstantin Knizhnik <knizhnik(at)garret(dot)ru>, Dilip Kumar <dilipbalaut(at)gmail(dot)com> |
| Subject: | Re: index prefetching |
| Date: | 2025-08-15 19:38:31 |
| Message-ID: | 7xmnrbftay26ybgtw25wwnmmwrquj4zvpkq7qgtnvgw6h7kiy2@4umex7kbhjfz |
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| Lists: | pgsql-hackers |
Hi,
On 2025-08-15 15:31:47 -0400, Peter Geoghegan wrote:
> On Fri, Aug 15, 2025 at 3:28 PM Andres Freund <andres(at)anarazel(dot)de> wrote:
> > >I'm not worried about it. Andres' "not waiting for already-in-progress
> > >IO" patch was clearly just a prototype. Just thought it was worth
> > >noting here.
> >
> > Are you confident in that? Because the patch should be extremely cheap in that case.
>
> I'm pretty confident.
>
> > What precisely were you testing?
>
> I'm just running my usual generic pgbench SELECT script, with my usual
> settings (so no direct I/O, but with iouring).
I see absolutely no effect of the patch with shared_buffers=1GB and a
read-only scale 200 pgbench at 40 clients. What data sizes, shared buffers
etc. were you testing?
Greetings,
Andres Freund
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