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.friedman@streetlightdata.com
From: Nikolay Samokhvalov <samokhvalov@gmail.com>
Sent: Monday, April 12, 2021 4:34 PM
To: Andres Freund <andres@anarazel.de>
Cc: Paul Friedman <paul.friedman@streetlightdata.com>; pgsql-performance@lists.postgresql.org
Subject: Re: LWLocks by LockManager slowing large DB
On Mon, Apr 12, 2021 at 14:57 Andres Freund <andres@anarazel.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
- pg_wait_sampling (can be used together with POWA monitoring)
- pgsentinel
- PASH Viewer (good for visualization, integrates with pgsentinel)
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