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Add support for running multiple Tornado threads #372
As discussed in #54, one of the main scalability constraints for Zulip is the fact that its Tornado-based event system only supports a single Tornado process; eventually that process will get backlogged with traffic (probably around 5K active users, though one could stretch it considerably by changing the heartbeat frequency at the cost of having Zulip not work on networks that drop long-lived TCP connections).
I can post a branch with partial work towards this if anyone is interested in working on it...