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Date: Thu, 08 May 2014 08:59:58 -0700
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To: Zeev Suraski <zeev@zend.com>, Andrea Faulds <ajf@ajf.me>
CC: Andi Gutmans <andi@zend.com>, Sebastian Bergmann <sebastian@php.net>, 
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Subject: Re: [PHP-DEV] phpng: Refactored PHP Engine with Big Performance Improvement
From: rasmus@lerdorf.com (Rasmus Lerdorf)

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On 5/8/14, 5:48 AM, Zeev Suraski wrote:
> Again, this is just history/habits.
> Nothing prevents creation of apache-fastcgi-php5 package that'll do the=

> exact same thing using FastCGI.

What you are calling history/habits here is also knows as operational
stability. Every change to a stack incurs operational costs which has to
be balanced against the benefits of changing a component. Even though it
seems like a trivial thing to change from Apache/mod_php to
Apache/mod_fcgid or nginx+php-fpm, the operational cost can be quite
high. Consider changes to the Nagios monitoring setup. Dev VM images all
have to be updated. Startup/shutdown/deploy and logging systems might be
affected along with integration tests. And for most environments
changing doesn't actually buy you anything. A typical PHP request spends
so little time in the web server compared to waiting on mysql and
memcache replies that even a major performance boost doesn't actually
give you much.

I fully agree that nginx+php-fpm is a nicer architecture. I like the
process separation that fastcgi brings and the saner and richer
configuration nginx brings along with the slight performance boost, but
even for my own use those benefits haven't outweighed the cost of
switching for me for systems that are running well under mod_php today.

-Rasmus


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