I'm giving a talk at OSCON on extending your Rails application with C and I thought I'd blog on a few gotchas as I work on the demo application and publish my preliminary "benchmark". (Don't get upset... it's not really a benchmark.)
I'm going to use two technologies for my C integration. RubyInline is used for dropping C in line to your Ruby code, hence the clever name. It's really easy to use and has very good docs.
The other technology is the plain old Ruby C Extensions. This is also very easy to use.
RubyInline compiles the C code on your first pass and then reuses the compiled code. Putting that file in a controller that you reload with every client visit really messes it up. This reload is done in development mode, not production mode.
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