Re: Estimating HugePages Requirements?

On 9/5/21, 9:26 PM, "Bossart, Nathan" <bossartn(at)amazon(dot)com> wrote:
> On 9/5/21, 7:28 PM, "Michael Paquier" <michael(at)paquier(dot)xyz> wrote:
>> Without concluding on 0002 yet, another thing that we could do is to
>> just add the GUCs. These sound rather useful on their own (mixed
>> feelings about huge_pages_required but I can see why it is useful to
>> avoid the setup steps and the backend already grabs this information),
>> particularly when it comes to cloned setups that share a lot of
>> properties.
>
> I think this is a good starting point, but I'd like to follow up on
> making them visible without completely starting the server. The main
> purpose for adding these GUCs is to be able to set up huge pages
> before server startup. Disallowing "-C huge_pages_required" on a
> running server to enable this use-case seems like a modest tradeoff.
>
> Anyway, I'll restructure the remaining patches to add the GUCs first
> and then address the 0002 business separately.

Attached is a new patch set. The first two patches just add the new
GUCs, and the third is an attempt at providing useful values for those
GUCs via -C.

Nathan