There are two types of HPC virtualization:
Scale-up Virtualization - a single hypervisor runs across multiple computers. This aggregates multiple CPUs and memory systems and makes them appear as a single computer. It is best for applications that require a lot of memory.
Scale-out Virtualization - a VM and hypervisor run on every processor core in each machine in the virtual supercomputer. A grid-management tool, rather than a single hypervisor as in scale-up HPC virtualization, manages the overall system. It is best for processor-intensive applications.
Read the full article from IEEE Computing Now.
P.S. - An hypervisor is the software that allocates a host machine's resources to each virtualized operating system or to each program running on a virtualized OS.
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