Re: PG 16 draft release notes ready

On Thu, May 25, 2023 at 05:57:25PM +1200, David Rowley wrote:
> 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.

Okay, item added to Source Code:

<!--
Author: David Rowley <drowley(at)postgresql(dot)org>
2022-08-29 [c6e0fe1f2] Improve performance of and reduce overheads of memory ma
-->

<listitem>
<para>
Reduce overhead of memory allocations (Andres Freund, David Rowley)
</para>
</listitem>

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Bruce Momjian <bruce(at)momjian(dot)us> https://momjian.us
EDB https://enterprisedb.com

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