Re: New PG14 server won't start with >2GB shared_buffers - Mailing list pgsql-admin

On Sat, Feb 25, 2023 at 9:05 AM MichaelDBA <MichaelDBA@sqlexec.com> wrote:

I just don't get what all this fuss is about trying to get PG up on the smallest possible values for shared_buffers, especially considering this person has 1 TB of memory?

The fuss is why he can't make it bigger.  No one wants to make it as small as possible.

Chris Hoover wrote on 2/25/2023 8:07 AM:

Here is shmall:

kernel.shmall = 17179869184

How did that get so small?  On my Ubuntu18.04, it comes out of the box at 2^64 - 1.  Why would anyone have set about making it smaller?  Now the current value should still be big enough, but I wonder what else got changed while someone was monkeying with things that didn't need to be monkeyed with.

Cheers,

Jeff