Michael Paquier <mich...@paquier.xyz> writes: > On Tue, Mar 14, 2023 at 02:02:19PM +0900, Kyotaro Horiguchi wrote: >> I slightly prefer using a function for this, as if GUC is used, it can >> only return "unknown" for the command "postgres -C >> huge_page_active". However, apart from this advantage, I prefer using >> a GUC for this information.
> The main advantage of a read-only GUC over a function is that users > would not need to start a postmaster to know if huge pages would be > active or not. I'm confused here, because Horiguchi-san is saying that that won't work. I've not checked the code lately, but I think that "postgres -C var" prints its results before actually attempting to establish shared memory, so I suspect Horiguchi-san is right. regards, tom lane