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References: <d8e5463d-c827-47e5-aa18-c6116cbd3533@daniil.it>
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Date: Wed, 18 Oct 2023 14:06:30 +0300
Message-ID: <CAPVMwwu55NiWo310p9aKWmCWDKBQtweqLGaTpnYD+U21h5qkKQ@mail.gmail.com>
To: Daniil Gentili <daniil@daniil.it>
Cc: internals@lists.php.net
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Subject: Re: [PHP-DEV] Change default method of disabling JIT for PHP 8.4
From: dmitrystogov@gmail.com (Dmitry Stogov)

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On Tue, Oct 17, 2023 at 8:46=E2=80=AFPM Daniil Gentili <daniil@daniil.it> w=
rote:

> Hello,
>
> I would like to submit an RFC and PR to change a few INI defaults for
> opcache, changing how JIT is disabled by default.
>
> Currently, JIT is disabled by default using the
> |opcache.jit_buffer_size=3D0| default, instead of |opcache.jit=3D0|.
>
> I.e. here are the defaults for these two configuration entries:
>
> - opcache.jit=3Dtracing
> - opcache.jit_buffer_size=3D0
>
> This effectively disables JIT not because `jit=3D0`, but rather because
> the buffer size is set to 0.
>
> I would like to change these defaults to:
>
> - opcache.jit=3Doff
> - opcache.jit_buffer_size=3D64m (taken from
> https://github.com/php/php-src/pull/12425/files, any smaller multiple of
> 2 causes the buffer to fill up when running moderately sized projects
> like Psalm or PHPStan).
>
> What do you think?
>

Actually, now opcache.jit=3D0/off/no/false doesn't disable JIT completely. =
It
makes PHP start requests with JIT disabled, but this may be changed during
the request.
JIT may be disabled completely by opcache.jit=3Ddisable

Thanks. Dmitry.


>
>
> Kind regards,
>
> Daniil Gentili.
>

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