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Thread-Topic: [PHP-DEV] JIT for PHP project
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Subject: Re: [PHP-DEV] JIT for PHP project
From: dmitry@zend.com (Dmitry Stogov)

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Hi Anatol,


The project is in the very early development stage.

Now, JIT passes almost all PHPT tests, makes 3 times speed-up on bench.php =
and no significant difference on real-life apps (+/-5% depended on opcache.=
jit setting.

We are hardly working, implementing new ideas...


I think it's too early to port this to Windows. Once, we think, we are read=
y, I'll ask your help.

I suppose we won't need ELF->COFF porting, because we construct ELF objects=
 just to debug JITed code in GDB and read PHP ELF object for simple symbol =
resolution in disassembler (most probably, both won't work on Windows anywa=
y).

zend_jit_x86.dasc will have to be adopted to support Windows calling conven=
tion, of course.


Thanks. Dmitry.





________________________________
From: Anatol Belski <anatol.php@belski.net>
Sent: Wednesday, October 26, 2016 1:49:49 PM
To: Dmitry Stogov; 'PHP internals list'
Cc: Zeev Suraski; Xinchen Hui
Subject: RE: [PHP-DEV] JIT for PHP project

Hi Dmitry,

> -----Original Message-----
> From: Dmitry Stogov [mailto:dmitry@zend.com]
> Sent: Thursday, September 1, 2016 1:57 PM
> To: PHP internals list <internals@lists.php.net>
> Cc: Zeev Suraski <zeev@zend.com>; Xinchen Hui <xinchen.h@zend.com>
> Subject: [PHP-DEV] JIT for PHP project
>
> Hi @internals,
>
> I'm glad to say that we have started a new JIT for PHP project and hope t=
o
> deliver some useful results for the next PHP version (probably 8.0).
> We are very early in the process and for now there isn't any real
performance
> improvement yet.  So far we spent just 2 weeks mainly working on JIT
> infrastructure for x86/x86_64 Linux (machine code generation,
disassembling,
> debugging, profiling, etc), and we especially made the JIT code-generator
as
> minimal and simple as possible. The current state, is going to be used as
a
> starting point for research of different JIT approaches and their
usability for PHP.
>
> The code is available at: https://github.com/zendtech/php-src/tree/jit-
> dynasm/ext/opcache/jit
>
> The sources may be built and tested as regular PHP (no any special
external
> dependencies required).
> JIT itself is implemented as a part of Opcache.
> You may try it in action:
>
> sapi/cli/php -d opcache.jit_buffer_size=3D32M Zend/bench.php sapi/cli/php=
 -d
> opcache.jit_buffer_size=3D32M -d opcache.jit_debug=3D1 Zend/bench.php 2>&=
1 |
> less
>
> As I mentioned we didn't try to achieve any real performance improvement
yet,
> although we do currently see 20% speedup on bench.php, but a bit of a
> slowdown on real-life apps.
>
> Wish us luck :)
>
I just wanted to ask about the status. After starting to do some basic work
https://github.com/zendtech/php-src/compare/jit-dynasm...weltling:jit-dynas=
m
I've stumbled upon a couple of things

- in zend_elf.c, the current binary that loads php is being read in, I gues=
s
this part needs to be ported to parse the Windows COFF format
- with DynASM, seems zend_jit_x86.dasc will need to be extended for some
compatibility, please correct if I'm wrong

Regarding these, maybe you've one or another tip for me? Is this still
relevant? Or I jump into it too early?

Thanks

anatol




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