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Thread-Topic: JIT for PHP project
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Date: Thu, 1 Sep 2016 11:57:24 +0000
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Subject: JIT for PHP project
From: dmitry@zend.com (Dmitry Stogov)

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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 performan=
ce improvement yet.  So far we spent just 2 weeks mainly working on JIT inf=
rastructure for x86/x86_64 Linux (machine code generation, disassembling, d=
ebugging, 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 usabili=
ty for PHP.

The code is available at: https://github.com/zendtech/php-src/tree/jit-dyna=
sm/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 ye=
t, although we do currently see 20% speedup on bench.php, but a bit of a sl=
owdown on real-life apps.

Wish us luck :)

Thanks. Dmitry.


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