Thread: Re: Changing shared_buffers without restart

Re: Changing shared_buffers without restart

From
Thomas Munro
Date:
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



Re: Changing shared_buffers without restart

From
Dmitry Dolgov
Date:
> 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.