RE: [PHP-DEV] [RFC] JIT

Hi Theodore, > -----Original Message----- > From: Theodore Brown <theodorejb@outlook.com> > Sent: Thursday, March 7, 2019 5:11 PM > To: Anatol Belski <ab@php.net>; Dmitry Stogov <dmitry@zend.com>; PHP > internals <internals@lists.php.net> > Cc: Joe Watkins <krakjoe@gmail.com> > Subject: Re: [PHP-DEV] [RFC] JIT > > On Tuesday, March 5, 2019 3:52 PM, Anatol Belski <ab@php.net> wrote: > > > > On Thursday, January 31, 2019 12:43 PM, Dmitry Stogov 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. > > > > > > > > Thanks. Dmitry. > > > > On Tuesday, March 5, 2019 3:38 PM, Dmitry Stogov <dmitry@zend.com> > wrote: > > > > > JIT also works for non-ZTS PHP Windows builds now. > > > > > > Thanks. Dmitry. > > > > I've uploaded a build from the latest branch state > > > > https://windows.php.net/downloads/snaps/ostc/jit-dynasm/20190305/, > > NTS/x64/SSE2/PGO. For PGO training, I've omitted some apps like > > Drupal/Symfony, as they're not yet compatible with 8.0, still a slight > > improvement with Zend/bench.php does show. > > > > Thanks > > > > Anatol > > I downloaded the Windows build and added the following settings to php.ini: > opcache.jit_buffer_size=10000000 > opcache.jit=1205 > > I'm not sure if these are ideal settings or not, but they produced a nearly 3x > speed improvement in the spectral-norm benchmark with $n=100 > (https://benchmarksgame- > team.pages.debian.net/benchmarksgame/program/spectralnorm-php- > 1.html). > > Unfortunately I can't test with our real-world app since it relies on the SQL > Server extension (https://github.com/Microsoft/msphpsql) > which doesn't support PHP 8 yet. > > I guess this would be one benefit to having the JIT be an experimental > feature in PHP 7.4 - extensions will likely support it long before they support > PHP 8 which will make it possible to test a lot more real-world use cases. > Thanks for sharing this! Once the required extension becomes available, a snapshot could be created for the further tests. Otherwise I had Wordpress running and several other simple apps, so those can be used for the tests, too. Regards Anatol