| From: | Andres Freund <andres(at)anarazel(dot)de> |
|---|---|
| To: | John Naylor <john(dot)naylor(at)enterprisedb(dot)com> |
| Cc: | David Rowley <dgrowleyml(at)gmail(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Julien Rouhaud <rjuju123(at)gmail(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Yura Sokolov <y(dot)sokolov(at)postgrespro(dot)ru>, PostgreSQL Developers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: Reducing the chunk header sizes on all memory context types |
| Date: | 2022-10-19 18:55:03 |
| Message-ID: | 20221019185503.eax7cf5gfghtz3dd@awork3.anarazel.de |
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| Lists: | pgsql-hackers |
Hi,
On 2022-10-11 10:21:17 +0700, John Naylor wrote:
> On Tue, Oct 11, 2022 at 5:31 AM David Rowley <dgrowleyml(at)gmail(dot)com> wrote:
> >
> > The proposed patches in [1] do aim to make additional usages of the
> > slab allocator, and I have a feeling that we'll want to fix the
> > performance of slab.c before those. Perhaps the Asserts are a better
> > option if we're to get the proposed radix tree implementation.
>
> Going by [1], that use case is not actually a natural fit for slab because
> of memory fragmentation.
>
> [1]
> https://www.postgresql.org/message-id/20220704220038.at2ane5xkymzzssb%40awork3.anarazel.de
Not so sure about that - IIRC I made one slab for each different size class,
which seemed to work well and suit slab well?
Greetings,
Andres Freund
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