| From: | John Naylor <john(dot)naylor(at)enterprisedb(dot)com> |
|---|---|
| To: | Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com> |
| Cc: | Nathan Bossart <nathandbossart(at)gmail(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, Matthias van de Meent <boekewurm+postgres(at)gmail(dot)com>, Yura Sokolov <y(dot)sokolov(at)postgrespro(dot)ru>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: [PoC] Improve dead tuple storage for lazy vacuum |
| Date: | 2022-09-28 07:49:43 |
| Message-ID: | CAFBsxsFXCdLa9ubttm7=UXPVECZq9=JbD+cgq4Qn39NYfvbGpA@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Wed, Sep 28, 2022 at 1:18 PM John Naylor <john(dot)naylor(at)enterprisedb(dot)com>
wrote:
> [stuff about size classes]
I kind of buried the lede here on one thing: If we only have 4 kinds
regardless of the number of size classes, we can use 2 bits of the pointer
for dispatch, which would only require 4-byte alignment. That should make
that technique more portable.
--
John Naylor
EDB: http://www.enterprisedb.com
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