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.
Hi Dmitry,
Thank you for making an RFC for this. That makes it possible to have a
proper discussion about the JIT idea.
A concern I have with the current RFC is a lack of a good case for why
it should be necessary; the case for JIT is based on performance
benefits, but the examples provided are unconvincing to me because they
seem too contrived. Both bench.php and drawing fractals represent a
best-case example for a JIT, small programs which do heavy arithmetic
and not much else. Maybe PHP being able to be used for this kind of
software would be cool, but it wouldn't justify the added complexity
(and for that matter security headaches) of adding a JIT to PHP given C,
C++, FORTRAN and so on already exist and are better-suited to it.
I guess what I am saying is that the JIT RFC could benefit from
real-world examples that show a benefit to having it. The ideal
application is something in between WordPress and your Mandelbrot
example, one which has significant complexity (i.e. a plausible
real-world application), hot code which a JIT can actually make notably
faster than the current Zend VM, and is something not *too* far away
from the kinds of applications people write in PHP today — even if you
*could* write applications focussed on high-performance heavy
number-crunching in PHP, I don't expect people would want to, even if it
becomes less slow.
Thanks,
Andrea
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