Newsgroups: php.internals
Path: news.php.net
Xref: news.php.net php.internals:104144
MIME-Version: 1.0
References: <DM6PR02MB59326E10841277F34E4EFF75BF910@DM6PR02MB5932.namprd02.prod.outlook.com>
 <CAEPJduk8zCuVotRKjU54R_hT806hvzrsUs9AguG4G=s7gSwo9w@mail.gmail.com>
In-Reply-To: <CAEPJduk8zCuVotRKjU54R_hT806hvzrsUs9AguG4G=s7gSwo9w@mail.gmail.com>
Date: Mon, 4 Feb 2019 23:48:55 +0100
Message-ID: <CAEPJdu=XKfAJ_YeeGs21pubeu3CAt6gBzuqHH67g9R+gROsJfQ@mail.gmail.com>
To: Dmitry Stogov <dmitry@zend.com>
Cc: PHP internals <internals@lists.php.net>
Content-Type: multipart/alternative; boundary="000000000000e5acd90581194cd3"
Subject: Re: [PHP-DEV] [RFC] JIT
From: kontakt@beberlei.de (Benjamin Eberlei)

--000000000000e5acd90581194cd3
Content-Type: text/plain; charset="UTF-8"

On Mon, Feb 4, 2019 at 10:29 PM Benjamin Eberlei <kontakt@beberlei.de>
wrote:

>
>
> On Thu, Jan 31, 2019 at 10:44 AM Dmitry Stogov <dmitry@zend.com> wrote:
>
>> Hi Internals,
>>
>>
>> I'm glad to finally propose including JIT into PHP.
>>
>>
>> https://wiki.php.net/rfc/jit
>>
>>
>> In the current state it may be included both into PHP-8, where we are
>> going to continue active improvement, and into PHP-7.4, as an experimental
>> feature.
>>
>
> Can you give some information on if there are pre-conditions that must
> hold for a function to be jitted, or quit conditions that force the JIT to
> be reverted for a function? In addition, it would be helpful for testing if
> there was a way to find out if a function was jitted, maybe through
> ReflectionMethod/Function or opcache_get_status() ?
>

And as a follow up, the JIT seems to affect zend_execute_ex and
zend_execute_internal based profiling (tested with tideways_xhprof) in a
way that all Jitted functions are not called through those two hooks
anymore, and don't appear in profiling data anymore. Is that a correct
description? The number of parent=>child call entries drops from 88 to 12
in my sample code when jit is activated.

Is that a desired side-effect?

>
>>
>> Thanks. Dmitry.
>>
>

--000000000000e5acd90581194cd3--