This is old-fashioned QEMU. To get the core-aware stuff, install a modern version of QEMU or the KVM under Linux, and use their CPU allocation tech. The old QEMU binaries in Levinux are for a high success rate of running the first time on a broad assortment of different hardware. When you get to optimization time, it’s time to change the QEMU framework. All the hard drive image files that make it Tiny Core Linux / Levinux should move over just about anywhere.