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One of the big reasons people have been interested in JRuby lately is because it is currently the only Ruby implementation that can both host multiple instances in a single process and run threads *actually* in parallel. Of course true parallel execution is not without its pitfalls, and we stumbled across one this week. No, it wasn't a lock contention issue or data corruption or anything you're thinking of. It was smaller, sneakier, and much lower-level.