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From: Andres Freund <[email protected]>
To: Magnus Hagander <[email protected]>
Cc: PostgreSQL Developers <[email protected]>
Subject: Re: Add parameter jit_warn_above_fraction
Date: Fri, 25 Feb 2022 08:20:43 -0800
Message-ID: <[email protected]> (raw)
In-Reply-To: <CABUevExR_9ZmkYj-aBvDreDKUinWLBBpORcmTbuPdNb5vGOLtA@mail.gmail.com>
References: <CABUevExR_9ZmkYj-aBvDreDKUinWLBBpORcmTbuPdNb5vGOLtA@mail.gmail.com>

Hi,

On 2022-02-25 16:16:01 +0100, Magnus Hagander wrote:
> This patch adds a configuration parameter jit_warn_above_fraction that
> will cause a warning to be logged if the fraction of time spent on
> doing JIT is bigger than the specified one. For example, this can be
> used to track down those cases where JIT ends up taking 90% of the
> query runtime because of bad estimates...

Hm. Could it make sense to do this as a auto_explain feature?

Greetings,

Andres Freund

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