| From: | Andres Freund <andres(at)anarazel(dot)de> |
|---|---|
| To: | Tomas Vondra <tomas(at)vondra(dot)me> |
| Cc: | Peter Geoghegan <pg(at)bowt(dot)ie>, Nazir Bilal Yavuz <byavuz81(at)gmail(dot)com>, Thomas Munro <thomas(dot)munro(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: | 2025-07-23 00:59:07 |
| Message-ID: | rybxcmbauhmbvqugsddozowhgeu3ksakwjswwz55wdcovfuzrv@5kupnuviicyn |
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| Lists: | pgsql-hackers |
Hi,
On 2025-07-23 02:50:04 +0200, Tomas Vondra wrote:
> But I don't see why would this have any effect on the prefetch distance,
> queue depth etc. Or why decreasing INDEX_SCAN_MAX_BATCHES should improve
> that. I'd have expected exactly the opposite behavior.
>
> Could be bug, of course. But it'd be helpful to see the dataset/query.
Pgbench scale 500, with the simpler query from my message.
Greetings,
Andres Freund
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