Samuli Kaipiainen and Matti Paksula from the University of Helsinki Department of Computer Science wrote a great overview of SVG and Canvas performance issues. The above summarizes some of their thoughts specifically about the need for a scene graph, something I’ve wished for (esp. in regard to WebGL).

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And I’m not just putting this up because they referenced my post on SVG vs. Canvas. Really.

The problem is that there are temp files like /tmp/passenger.1234 which have some kind of permissions problem.

To resolve this, you can simply delete those files, like with:

sudo rm -r /tmp/passenger*

and reboot Instiki (Apache, really):

sudo apachectl graceful

Instiki allows you to define a DEFAULT_WEB in your /config/environment.rb, but it won’t redirect the web root to that web’s HomePage, which would seem to be the point. Darn. So I forked and patched Instiki on Github, adding the following code to replace line 26 of /app/controllers/wiki_controller.rb:

      if defined? DEFAULT_WEB
        @web_name = DEFAULT_WEB
        redirect_home
      else
        redirect_to :action => 'web_list'
      end

Now if I go to wiki.grassrootsmapping.org, I see the HomePage of my default web. Hooray!

Update: OK, my bad. This is unnecessary:

As distler pointed out on Github, defining DEFAULT_WEB should work out of the box. Why didn’t it work for me, I wondered?

Well, I put the line:

DEFAULT_WEB = 'wiki'

in environment.rb, but I put it OUTSIDE the Rails::Initializer.run do |config| block. Putting that line inside that code block solved my problem.

I’m leaving this all up for future generations to learn from my mistakes. (Most likely me in a year or so.)

http://github.com/jywarren/cartagen

Finally.