Re: Increase Vacuum ring buffer.

* Robert Haas (robertmhaas(at)gmail(dot)com) wrote:
> On Thu, Jul 20, 2017 at 3:04 PM, Stephen Frost <sfrost(at)snowman(dot)net> wrote:
> > I agree that it's a common problem for VACUUM to go too fast, or for
> > VACUUM to go too slow, but that's really what the vacuum_cost_limit
> > mechanism is for.
>
> I think that's a valid point. There are also other concerns here -
> e.g. whether instead of adopting the patch as proposed we ought to (a)
> use some smaller size, or (b) keep the size as-is but reduce the
> maximum fraction of shared_buffers that can be consumed, or (c) divide
> the ring buffer size through by autovacuum_max_workers. Personally,
> of those approaches, I favor (b). I think a 16MB ring buffer is
> probably just fine if you've got 8GB of shared_buffers but I'm
> skeptical about it when you've got 128MB of shared_buffers.

Right, agreed on that and that (b) looks to be a good option there.

Thanks!

Stephen