[jerdavis]

Just going to get on the hater train here. (not any poster in particular but Mongo in general). The day Postgres releases an upgrade, I expect, and get 100% functionality. So the fact that this is "Just Released" is FAR from an excuse, in fact it shows EXACTLY why you shouldn't use Mongo. Also a 100GB DB, with 300 connections and several MB per second.. Seriously. WTF is wrong with you people? Multiply by 10, and you can still do that on 1 machine.

[nasalgoat]

MongoDB performance is abysmal - I'm running 50 machines with massive memory, CPU and disk resources to get, maybe, 20,000 queries/sec per master.

There appears to be zero CPU or memory optimization in place. Mostly I blame the mmapped files.