Re: Estimating HugePages Requirements?

On Thu, Jun 10, 2021 at 12:42 AM Don Seiler <don(at)seiler(dot)us> wrote:
>
> I'm told other factors contribute to this additional memory requirement, such as max_connections, wal_buffers, etc. I'm wondering if anyone has been able to come up with a reliable method for determining the HugePages requirements for a PG cluster 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 ;