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This is an option that has been long overdue for removal. It's original intention was primarily to lie to the guest application about the number of cores in the system. This allowed us to say that the system was only single threaded which worked around some threading bugs that we had early on. This is no longer the case and now it is a confusing remnant of the past that people think they need to set. Incorrectly assuming that "0" by default means that FEX is doing some sort of disabling of threading and forcing all emulation down one CPU core. This is not the case and has never been the case, so removing the option makes that idea go away.