Re: [RFC] JIT

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. >> >