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Re: Change default of jit to off

Tomas Vondra <tomas@vondra.me>

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From: Tomas Vondra <tomas@vondra.me>
To: Jelte Fennema-Nio <postgres@jeltef.nl>, Andres Freund <andres@anarazel.de>
Cc: Greg Sabino Mullane <htamfids@gmail.com>, Adrien Nayrat <adrien.nayrat@anayrat.info>, Christoph Berg <myon@debian.org>, Euler Taveira <euler@eulerto.com>, Pierre Ducroquet <p.psql@pinaraf.info>, Álvaro Herrera <alvherre@kurilemu.de>, PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>, Andreas Karlsson <andreas@proxel.se>, Anthonin Bonnefoy <anthonin.bonnefoy@datadoghq.com>, pgsql-hackers <pgsql-hackers@postgresql.org>, Michael Banck <mbanck@gmx.net>
Date: 2026-03-20T16:03:15Z
Lists: pgsql-hackers 
On 2/13/26 15:57, Jelte Fennema-Nio wrote:
> On Tue, 3 Feb 2026 at 18:13, Andres Freund <andres@anarazel.de> wrote:
>> +1 for disabling it by default. Particularly with partitioning having become
>> much more common since jit compilation was added, combined with LLVM getting a
>> lot slower over time, that's unfortunately the right call until some
>> substantial improvements are made.
> 
> I'm marking this as ready for committer.
> 

ISTM there's a clear consensus to get this committed for PG19, so
barring objections I'll take care of that in the next couple days.
Unless someone else wants to ...

Another option would be to leave that for mid-beta, which is where we
tweaked the io_method GUCs last year. But we did that to get some
testing for 'worker' (in case we revert to 'sync'), and we don't need
that for jit.


regards

-- 
Tomas Vondra

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  1. jit: Change the default to off.