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FastCGI and mod_perl comparedby mandog (Curate)
|on Aug 27, 2001 at 03:08 UTC||Need Help??|
This recent thread on improving performance contained a node by mugwumpjism that got me thinking about CGI performance. So to feed my thoughts, I poked around the net a bit and came to the conclusion that:
Since I started the afternoon predisposed to notice facts that supported my mod_perl prejudice, I thought it best to get a couple second opinions before installing mod_perl and modifying my scripts based on the information that follows.
Both FastCGI and mod_perl achieve their speed-up by avoiding the overhead of starting a process for each CGI request. This overhead is apparently more noticeable with perl CGI scripts than with compiled C programs. A Perl script has to be re-compiled each time it is run. Speed increases of 400 to 2000 percent are claimed.
Both FastCGI and mod_perl claim benefits beyond speed-up. As a novice I don't understand what many of these features are but according to this chart, mod_perl has more of em.
mod_perl seems to have wider support and more active development.
Via google I turned up a few external nodes comparing FastCGI to mod_perl. Several people remarked that they'd found FastCGI support lacking.
The process for installing FastCGI looks a little scary. The docs begin something like: "...you need a FastCGI-savvy version of Perl..." There doesn't seem to be a debian package for FastCGI...
While they aren't relevant to my situation, FastCGI does seem to have strengths that mod_perl lacks.
I'm not clear on how big a feature the last point actually is. Is there a big difference between running (4) Apache/mod_perl boxes and a database box and running (2) FastCGI boxes, (2) Apache boxes and a database box?--mandog