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Date: Thu, 14 Feb 2019 10:27:24 -0700
Message-ID: <CAFMT4NogTLm3-g8MuPt5rA2qMCMZemTr8wMcOJv1fN+Az4FuAQ@mail.gmail.com>
To: Zeev Suraski <zeev@php.net>
Cc: Joe Watkins <krakjoe@gmail.com>, Rowan Collins <rowan.collins@gmail.com>, 
	PHP internals <internals@lists.php.net>
Content-Type: text/plain; charset="UTF-8"
Subject: Re: [PHP-DEV] Re: ZTS improvement idea
From: levim@php.net (Levi Morrison)

To all internals, but especially to Zeev and Dmitry,

Having a JIT which does not support ZTS is a bit short-sighted. Think
about it. You want to add a JIT partly so that PHP will be better at
non-web, CPU intensive tasks. If the JIT is successful, eventually you
will want parallelism in that domain, and if you are going to use
threading then something like ZTS is required.

Additionally, a lot of people are using ZTS builds today. You can
argue all you want, we can't remove it easily. Imagine if I proposed a
breaking change in the language that would affect these same users.
Unless we got a *lot* of value out of it, I don't think it would pass.
And no offense, but in its current state the JIT does not have a lot
of value. It's a promising prototype, but it's not going to help the
vast majority of our users.

So, respectfully, I hope we can quit talking about removing ZTS. It is
required for the present, and it will probably be desirable in the
future. Therefore, *some* mechanism for a thread-safe JIT code
generation is a requirement. It doesn't necessarily have to be the ZTS
we have today, but it needs something.

Regards,

Levi Morrison