| From: | David Rowley <dgrowleyml(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>, 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: | 2021-07-22 04:43:51 |
| Message-ID: | CAApHDvqoF7y7SQjGT=940njnAd_CUcUG6oRYChcP_+eJyuNiug@mail.gmail.com |
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| Lists: | pgsql-performance |
On Thu, 22 Jul 2021 at 16:37, ldh(at)laurent-hasson(dot)com
<ldh(at)laurent-hasson(dot)com> wrote:
> Seems like no cigar ☹ See plan pasted below. I changed the conf as follows:
> - hash_mem_multiplier = '2'
> - work_mem = '1GB'
> Batches: 5 Memory Usage: 2400305kB Disk Usage: 126560kB
You might want to keep going higher with hash_mem_multiplier until you
see no "Disk Usage" there. As mentioned, v11 didn't spill to disk and
just used all the memory it pleased. That was a bit dangerous as it
could result in OOM, so it was fixed.
David
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