| From: | John Naylor <john(dot)naylor(at)enterprisedb(dot)com> |
|---|---|
| To: | David Rowley <dgrowleyml(at)gmail(dot)com> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Andres Freund <andres(at)anarazel(dot)de>, 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: | 2022-10-11 03:21:17 |
| Message-ID: | CAFBsxsG6ovgFjYH2A+ZPwcabLFvsB3yNZTxowfvjSBtR7VbO3g@mail.gmail.com |
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| Lists: | pgsql-hackers |
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. The motivation to use slab there was that the
allocation sizes are just over a power of two, leading to a lot of wasted
space for aset. FWIW, I have proposed in that thread a scheme to squeeze
things into power-of-two sizes without wasting quite as much space. That's
not a done deal, of course, but it could work today without adding memory
management code.
[1]
https://www.postgresql.org/message-id/20220704220038.at2ane5xkymzzssb%40awork3.anarazel.de
--
John Naylor
EDB: http://www.enterprisedb.com
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