I've recently put up a newspaper site on Webfaction that was developed
without much concern for memory limits--coming from PHP, my knowledge
of memory issues is practically nil. Of course, Webfaction's plans all
have memory limits, and we're currently on Shared 1, which imposes a
40MB limit. We're running the standard apache2/mod_python config, with
media served via a separate apache2 process as Webfaction and the
Django site recommends. The Debug setting has been set to False. I
believe those are the standard steps recommended for reducing resource
usage.
Here's a look at the ps output:
PID RSS COMMAND
17122 19652 /home/---/webapps/django/apache2/bin/httpd -f /home/---/
webapps/django/apache2/conf/httpd.conf
19823 32232 /home/---/webapps/django/apache2/bin/httpd -f /home/---/
webapps/django/apache2/conf/httpd.conf
19824 30612 /home/---/webapps/django/apache2/bin/httpd -f /home/---/
webapps/django/apache2/conf/httpd.conf
4253 1808 sshd: [EMAIL PROTECTED]/2
4254 1456 -bash
5204 936 /bin/sh /home/---/scripts/mem-usage
5205 764 ps -u --- -o pid,rss,command
5206 708 awk {print $0}{sum+=$2} END {print "Total", sum}
Total 88168
Presumably the three apache2 processes are the Django processes that
actually count against the memory usage limit; they add up to about
80MB. Clearly there is a problem here. Because we don't yet have the
domain for the site, traffic has been extremely low (basically just
one person entering data into the site); I fear for the day we open up
the site to everyone, mainly because I have no clue how memory usage
will rocket when people start visiting the site on a regular basis.
I also have no conception of what is "normal" memory usage for an
application. For all I know, the complexity of the site may simply
demand 80MB of RAM, and there might be nothing I can do about it. How
I go about figuring that out, though, is a big mystery for me.
So I guess my questions are: how do I optimize my Django setup to use
less memory? Should I be looking at the Django project I built for
ways to optimize the code, and what should I look for? Is there a
general guide on optimizing Django applications, or at least some tips
and tricks? And how can I audit the project I've built to figure out
if 80MB is actually reasonable or if I should be able to crush it down
further?
(P.S. If someone has any idea what Webfaction means when it says you
should be able to run "3 small Django sites" in 40MB, I'd love to
know. What constitutes a "small site," anyways?)
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