RE: LWLocks by LockManager slowing large DB

Thanks for this – these tools (and the raw selects on pg_stat_activity and
pg_locks) are all showing wait events being created by LockManager waiting
on an LWLock.

---Paul

Paul Friedman

CTO

677 Harrison St | San Francisco, CA 94107

*M:* (650) 270-7676

*E-mail:* paul(dot)friedman(at)streetlightdata(dot)com

*From:* Nikolay Samokhvalov <samokhvalov(at)gmail(dot)com>
*Sent:* Monday, April 12, 2021 4:34 PM
*To:* Andres Freund <andres(at)anarazel(dot)de>
*Cc:* Paul Friedman <paul(dot)friedman(at)streetlightdata(dot)com>;
pgsql-performance(at)lists(dot)postgresql(dot)org
*Subject:* Re: LWLocks by LockManager slowing large DB

On Mon, Apr 12, 2021 at 14:57 Andres Freund <andres(at)anarazel(dot)de> wrote:

Without knowing the proportion of LockManager wait events compared to
the rest it's hard to know what to make of it.

These OSS tools can be useful to understand the proportion:

- pgCenter

https://github.com/lesovsky/pgcenter

- pg_wait_sampling (can be used together with POWA monitoring)

https://github.com/postgrespro/pg_wait_sampling

- pgsentinel

https://github.com/pgsentinel/pgsentinel

- PASH Viewer (good for visualization, integrates with pgsentinel)

https://github.com/dbacvetkov/PASH-Viewer