| From: | David Rowley <dgrowleyml(at)gmail(dot)com> |
|---|---|
| To: | Bruce Momjian <bruce(at)momjian(dot)us> |
| Cc: | Andres Freund <andres(at)anarazel(dot)de>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: PG 16 draft release notes ready |
| Date: | 2023-05-25 05:57:25 |
| Message-ID: | CAApHDvozHpXLSte2CLOHjk+VG5cuhZExM+41rpEGuxorK_Yx3w@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Thu, 25 May 2023 at 05:45, Bruce Momjian <bruce(at)momjian(dot)us> wrote:
>
> On Wed, May 24, 2023 at 01:43:50PM -0400, Bruce Momjian wrote:
> > > * Reduce palloc() memory overhead for all memory allocations down to 8
> > > bytes on all platforms. (Andres Freund, David Rowley)
> > >
> > > This allows more efficient use of memory and is especially useful in
> > > queries which perform operations (such as sorting or hashing) that
> > > require more than work_mem.
> >
> > Well, this would go in the source code section, but it seems too
> > internal and global to mention.
>
> What was the previous memory allocation overhead?
On 64-bit builds, it was 16 bytes for AllocSet contexts, 24 bytes for
generation contexts and 16 bytes for slab contexts.
David
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