I'm playing around with node.js, trying to re-write a particularly
poorly designed part of my production system at work. So far, so good,
I use rabbitmq for messaging, and my node.js part of the system runs
ghostscript command line tool to convert tiff files to pdf. Obviously
I need to make sure I'm not running more than some fixed amount of
conversions at a time. What would be the best way to do this with
node? I understand that maybe node.js isn't really about running heavy
disk IO stuff, but I'm having too much fun with it to quit. I was
considering just using a blocking call to execute command line
utilities but the thing is that some messages don't require this
conversion and there's no need to delay their processing.

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