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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: Andrew Dunstan <andrew@dunslane.net>, Thomas Munro <thomas.munro@gmail.com>
Cc: Andres Freund <andres@anarazel.de>, Pierre Ducroquet <p.psql@pinaraf.info>, Tom Lane <tgl@sss.pgh.pa.us>, Jelte Fennema-Nio <postgres@jeltef.nl>, Greg Sabino Mullane <htamfids@gmail.com>, Adrien Nayrat <adrien.nayrat@anayrat.info>, Christoph Berg <myon@debian.org>, Euler Taveira <euler@eulerto.com>, 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: 2026-04-12T22:27:33Z
Lists: pgsql-hackers 
On 4/2/26 21:46, Tomas Vondra wrote:
> 
> 
> On 4/2/26 15:10, Andrew Dunstan wrote:
>>
>> On 2026-04-02 Th 8:50 AM, Thomas Munro wrote:
>>> On Fri, Apr 3, 2026 at 12:52 AM Tomas Vondra <tomas@vondra.me> wrote:
>>>> Pushed, after rewording the commit message a little bit, and removing
>>>> the sentence in the docs saying
>>>>
>>>>      (before PostgreSQL 19 the default was on)
>>> How can we keep it enabled in the build farm?
>>>
>>>
>>
>> No easy way to do it globally - I guess we could default it to on in the
>> next client release. Individual owners can enable it in their buildfarm
>> configs, in the extra_config section.
>>
> 
> That's a good idea. Maybe we should ping the buildfarm owners (those
> that are already running --with-llvm) to add jit=on.
> 
> I'll do that on my two clang animals dikkop/jay, and maybe on some of
> the gcc ones too. But I'll wait a bit, I don't want to upset them right
> before feature freeze.
> 

FWIW I've now done this on my 5 animals - dikkop, turaco, widowbird, jay
and hippopotamus. None of them was even building with LLVM before. On
the last two it was a bit of a struggle, due to having old gcc and LLVM.

regards

-- 
Tomas Vondra

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  1. jit: Change the default to off.