Magnus Hagander <magnus@hagander.net> writes:
> On Wed, Jun 9, 2021 at 9:15 PM Tom Lane <tgl@sss.pgh.pa.us> wrote:
>> Just try to start the server and see if it complains.
> Well, I have to *stop* the existing one first, most likely, otherwise
> there won't be enough huge pages (or indeed memory) available.
I'm not following. If you have a production server running, its
pg_shmem_allocations total should already be a pretty good guide
to what you need to configure HugePages for. You need to know to
round that up, of course --- but if you aren't building a lot of
slop into the HugePages configuration anyway, you'll get burned
down the road.
regards, tom lane