| From: | Thomas Munro <thomas(dot)munro(at)gmail(dot)com> |
|---|---|
| To: | Tomas Vondra <tomas(at)vondra(dot)me> |
| Cc: | Melanie Plageman <melanieplageman(at)gmail(dot)com>, Noah Misch <noah(at)leadboat(dot)com>, vignesh C <vignesh21(at)gmail(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org>, Heikki Linnakangas <hlinnaka(at)iki(dot)fi>, Nazir Bilal Yavuz <byavuz81(at)gmail(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, "Andrey M(dot) Borodin" <x4mmm(at)yandex-team(dot)ru> |
| Subject: | Re: Confine vacuum skip logic to lazy_scan_skip |
| Date: | 2025-01-18 21:45:59 |
| Message-ID: | CA+hUKGKpq06A5=u5Fcx6B4t6QJxJp=E2jtxL6cZwY1N3ZbeU4w@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Sun, Jan 19, 2025 at 10:31 AM Thomas Munro <thomas(dot)munro(at)gmail(dot)com> wrote:
> read_stream.c doesn't do that
> sort of multiplication itself,
Actually for completeness there is a place where it allocates local
memory for max I/Os * 4, and that 4 is a not entirely unbogus and
should change to io_combine_limit for the AIO stuff. Patches in
progress, more soon. But that'd not be using MAX_IO_COMBINE_LIMIT or
the number of system-wide I/O, it'd be your (usually much smaller)
configured limits. But I'll write about that with more details in a
new thread...
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