While you'll probably run out of memory first, there's the enormous overhead of running qemu's translation, too. Using QEMU to emulate x86 on my POWER9 system,

While you'll probably run out of memory first, there's the enormous overhead of running qemu's translation, too. Using QEMU to emulate x86 on my POWER9 system, I get... roughly the performance of a 2001-2004 pentium processor, and the host cpu is running at 3.8GHz and comparable speed wise to a 2018ish intel processor. In spite of the author's insistence, I don't think Cosmopolitan is really usable on anything but x86, the QEMU thing is more a cute proof-of-concept. For very simple programs I guess...