Re: Changing shared_buffers without restart

Dmitry Dolgov <9erthalion6@gmail.com>

From: Dmitry Dolgov <9erthalion6@gmail.com>

To: Thomas Munro <thomas.munro@gmail.com>

Cc: pgsql-hackers@postgresql.org

Date: 2024-11-08T16:40:03Z

Lists: pgsql-hackers

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

Remove PG_MMAP_FLAGS from mem.h
- c100340729b6 19 (unreleased) landed
Improve runtime and output of tests for replication slots checkpointing.
- 4464fddf7b50 18.0 cited
Revert support for improved tracking of nested queries
- f85f6ab051b7 18.0 cited
Use exported symbols list on macOS for loadable modules as well
- 3feff3916ee1 18.0 cited
Add support for basic NUMA awareness
- 65c298f61fc7 18.0 cited
Avoid unnecessary copying of a string in pg_restore.c
- 5e1915439085 18.0 cited
aio: Infrastructure for io_method=worker
- 55b454d0e140 18.0 cited
Improve InitShmemAccess() prototype
- 2a7b2d97171d 18.0 landed

> On Thu, Nov 07, 2024 at 02:05:52PM GMT, Thomas Munro wrote:
> On Sat, Oct 19, 2024 at 8:21 AM Dmitry Dolgov <9erthalion6@gmail.com> wrote:
> > Currently it
> > supports only an increase of shared_buffers.
>
> Just BTW in case it is interesting, Palak and I experimented with how
> to shrink the buffer pool while PostgreSQL is running, while we were
> talking about 13453ee (which it shares infrastructure with).  This
> version fails if something is pinned and in the way of the shrink
> operation, but you could imagine other policies (wait, cancel it,
> ...):
>
> https://github.com/macdice/postgres/commit/db26fe0c98476cdbbd1bcf553f3b7864cb142247

Thanks, looks interesting. I'll try to experiment with that in the next
version of the patch.