JIT for PHP project

7 years ago by Dmitry Stogov — view source

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Hi @internals,

I'm glad to say that we have started a new JIT for PHP project and hope to 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=32M Zend/bench.php
sapi/cli/php -d opcache.jit_buffer_size=32M -d opcache.jit_debug=1 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 :)

Thanks. Dmitry.

7 years ago by Xinchen Hui — view source

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Hey:

Hi @internals,

I'm glad to say that we have started a new JIT for PHP project and hope to
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=32M Zend/bench.php
sapi/cli/php -d opcache.jit_buffer_size=32M -d opcache.jit_debug=1
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.

Actually, if you are lucky like me, you may see like 5% improvement on
wordpress. :)

thanks

Wish us luck :)

Thanks. Dmitry.

--
Xinchen Hui
@Laruence
http://www.laruence.com/

7 years ago by S.A.N — view source

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Is planned async/await and native event-loop (maybe libuv)?

Thank.

7 years ago by Anatol Belski — view source

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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 to
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=32M Zend/bench.php sapi/cli/php -d
opcache.jit_buffer_size=32M -d opcache.jit_debug=1 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-dynasm
I've stumbled upon a couple of things

in zend_elf.c, the current binary that loads php is being read in, I guess
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

7 years ago by Dmitry Stogov — view source

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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 ready, 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 anyway).

zend_jit_x86.dasc will have to be adopted to support Windows calling convention, of course.

Thanks. Dmitry.

7 years ago by Anatol Belski — view source

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Hi Dmitry,

Thanks for the info. Probably I'm just too curious :) Please count on me
once it becomes relevant to hand out some part.

Regards

Anatol

-----Original Message-----
From: Dmitry Stogov [mailto:dmitry@zend.com]
Sent: Wednesday, October 26, 2016 1:31 PM
To: Anatol Belski anatol.php@belski.net; 'PHP internals list'
internals@lists.php.net
Cc: Zeev Suraski zeev@zend.com; Xinchen Hui xinchen.h@zend.com
Subject: Re: [PHP-DEV] JIT for PHP project

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
ready, 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
anyway).

zend_jit_x86.dasc will have to be adopted to support Windows calling
convention, 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 to 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=32M Zend/bench.php
sapi/cli/php -d opcache.jit_buffer_size=32M -d opcache.jit_debug=1
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-dynasm

I've stumbled upon a couple of things

in zend_elf.c, the current binary that loads php is being read in, I
guess 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

7 years ago by S.A.N — view source

unread

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.

Have you tried to measure in frameworks as PHP script daemon, such as
Amp, ReactPhp, etc...?
Perhaps there will be two-fold increase in performance.
If yes, then this is a good argument to implement in PHP 8, native
application server, like Express in Node.js?

Thank.