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If you're controlling car brakes, no, don't use Erlang. That's called "hard real time" and mostly gets written in C or Ada or those kinds of low level things: http://en.wikipedia.org/wiki/Real-time_computing

For most other things, Erlang is a fine choice. In your other comments you talking about web pages. People compose those all the time with languages like PHP and Ruby, and things mostly work out.

Odds are, with a lot of web stuff, a decent portion of your latency is going to be in the data layer anyway.

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