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List: apache-modperl
Subject: Re: getting to know more about mod_perl
From: Jonathan Vanasco <modperl-list () 2xlp ! com>
Date: 2006-08-29 22:56:46
Message-ID: E4EEBFFB-F28E-448D-BDCA-BF64D833AF1F () 2xlp ! com
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On Aug 29, 2006, at 3:08 PM, Adriano Ferreira wrote:
> I meant cost with respect to the machine resources: mainly, memory and
> processor time. Thanks a lot for the various references that I am
> going to absorb.
mod_perl consumes more memory than php- php compiles into a smaller
footprint, but it is a bit faster.
mod_perl caches the compiled perl code into memory. php requires a
third party cache to do that ( eaccelerator or one of the other
opcode optimizers that also do memory caching ).
mod_perl requires apache- its about extending /configuring apache
with perl, and interfacing with the entire server and request
cycle. in essence, mod_perl gives you a fully scriptable web server.
php is just a content-generating scripting language. you can run it
via mod_php or fastcgi, or even with a non-apache server (lighttpd,
nginx, thtppd ). it doesn't hook into any server like mod-perl.
the drawback to that, is that you're locked into Apache if you use
mod_perl... and you have more server options if you use PHP. That's
only for the dynamic content though- with a smart reverse proxy or
load balancer, you can specify which servers serve what.
> About security (as an example), I remember to have read somewhere that
> Apache::DBI can be dangerous because of the sharing of the DB
> connections and the openness of Perl - a malevolent user could try
> (and succeed) to access connections of other applications as they are
> running in the same interpreter. But, there are no such issues in PHP
> as well?
possibly, but its a moot point. (btw, it would generally be
applications running in the same apache child, as db connections are
best made post-fork )
because of design of mod_perl (ie intensive memory use ) people do
not normally run mod_perl on a shared server. mp usually sits on
its own box, and is tweaked for speed / performance -- getting the
most out of your server.
php is also geared towards multi-user setups (ie: shared hosting).
if you want to talk about security though, php has a long history of
bad security exploits. they've gotten a lot better, but for a few
years, you'd have to upgrade php every other week.
in practice , i've seen that people make 'applications' on mod_perl-
large systems that serve a single purpose - and 'projects' in php.
i'm not saying that you can't make a large site in php or a small
site in mod_perl... i'm just saying that its best to choose the right
tool for the job. everyone i know who does anything semi-large in
php, goes crazy tweaking 3rd party optimizers and accelerators
in terms of programmers, there's a plethora of awful-novice php
programmers out there, that will work for next to nothing. probably
100x more than mod_perl programmers.
but you get what you pay for.
a well versed php or mod_perl expert are both going to demand
similar wages, and be 100% worth their cost.
look at what you want to build now, and where you want it to go
tomorrow-- and choose the right tool for that job. it might be
mod_perl, it might be php, it might be something else. but
popularity and marketing are hands down the two WORST factors to go
by though.
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