Re: Estimating HugePages Requirements? - Mailing list pgsql-admin

On Thu, Jun 10, 2021 at 12:42 AM Don Seiler <don@seiler.us> wrote:
>
> I'm told other factors contribute to this additional memory requirement, such as max_connections, wal_buffers, etc.
I'mwondering if anyone has been able to come up with a reliable method for determining the HugePages requirements for a
PGcluster based on the GUC values (that would be known at deployment time). 

It also depends on modules like pg_stat_statements and their own
configuration.  I think that you can find the required size that your
current configuration will allocate with:

SELECT sum(allocated_size) FROM pg_shmem_allocations ;