Re: Performance bottleneck. High active sessions but postmaster kernel threads are in a sleep state, low CPU utilization

From: Hotmail <crajac66(at)hotmail(dot)com>
To: pgsql-admin(at)lists(dot)postgresql(dot)org, Laurenz Albe <laurenz(dot)albe(at)cybertec(dot)at>
Subject: Re: Performance bottleneck. High active sessions but postmaster kernel threads are in a sleep state, low CPU utilization
Date: 2021-03-31 16:00:28
Message-ID: BYAPR06MB4023DC744EFE7E1E55BA41C0D77C9@BYAPR06MB4023.namprd06.prod.outlook.com
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Unfortunately, the wait_event and wait_event_type columns are all NULL for these active sessions.

Craig
On Mar 31, 2021, 3:47 AM -0600, Laurenz Albe <laurenz(dot)albe(at)cybertec(dot)at>, wrote:
> On Tue, 2021-03-30 at 12:22 -0600, Hotmail wrote:
> > We are trying to gain some insight into a performance bottleneck that we are hitting while load testing Postgres on 11.11.
> > [hundreds of active sessions, but CPU is not maxed out]
>
> With that many active sessions you are probably hitting some contention inside
> the database. Look at "wait_event" and "wait_event_type" in pg_stat_activity.
>
> Yours,
> Laurenz Albe
> --
> Cybertec | https://www.cybertec-postgresql.com
>

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