| From: | "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com> |
|---|---|
| To: | "ldh(at)laurent-hasson(dot)com" <ldh(at)laurent-hasson(dot)com> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Peter Geoghegan <pg(at)bowt(dot)ie>, David Rowley <dgrowleyml(at)gmail(dot)com>, Justin Pryzby <pryzby(at)telsasoft(dot)com>, "pgsql-performance(at)postgresql(dot)org" <pgsql-performance(at)postgresql(dot)org> |
| Subject: | Re: Big performance slowdown from 11.2 to 13.3 |
| Date: | 2021-07-28 03:06:59 |
| Message-ID: | CAKFQuwakkn=FDRpEaUa4EXHrhHpKAFWn1fv9CRes0VfpxFTMrw@mail.gmail.com |
| Views: | Whole Thread | Raw Message | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-performance |
On Tue, Jul 27, 2021 at 7:57 PM ldh(at)laurent-hasson(dot)com <
ldh(at)laurent-hasson(dot)com> wrote:
> hash_mem_multiplier is an upper-bound right: it doesn't reserve memory
> ahead of time correct?
>
Yes, that is what the phrasing "maximum amount" in the docs is trying to
convey.
https://www.postgresql.org/docs/current/runtime-config-resource.html#RUNTIME-CONFIG-RESOURCE-MEMORY
But also note that it is "each operation" that gets access to that limit.
David J.
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Tom Lane | 2021-07-28 03:15:52 | Re: Big performance slowdown from 11.2 to 13.3 |
| Previous Message | ldh@laurent-hasson.com | 2021-07-28 02:57:48 | RE: Big performance slowdown from 11.2 to 13.3 |