Re: Change default of jit to off

From: Tomas Vondra <tomas(at)vondra(dot)me>
To: Andrew Dunstan <andrew(at)dunslane(dot)net>, Thomas Munro <thomas(dot)munro(at)gmail(dot)com>
Cc: Andres Freund <andres(at)anarazel(dot)de>, Pierre Ducroquet <p(dot)psql(at)pinaraf(dot)info>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Jelte Fennema-Nio <postgres(at)jeltef(dot)nl>, Greg Sabino Mullane <htamfids(at)gmail(dot)com>, Adrien Nayrat <adrien(dot)nayrat(at)anayrat(dot)info>, Christoph Berg <myon(at)debian(dot)org>, Euler Taveira <euler(at)eulerto(dot)com>, Álvaro Herrera <alvherre(at)kurilemu(dot)de>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>, Andreas Karlsson <andreas(at)proxel(dot)se>, Anthonin Bonnefoy <anthonin(dot)bonnefoy(at)datadoghq(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>, Michael Banck <mbanck(at)gmx(dot)net>
Subject: Re: Change default of jit to off
Date: 2026-04-12 22:27:33
Message-ID: ebfe51f8-ac31-4714-97ab-2dcd70bffb16@vondra.me
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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(at)vondra(dot)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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