CPU Processors and Memory Affinity

If your virtual machine is on an ESXi system, and if you have a license that supports Symmetric Multiprocessors (SMP), you can configure the virtual machine to have multiple virtual CPUs by setting cpuAffinity and memoryAffinity. You define a set of integers that represents the processors (for CPU) and NUMA nodes (for memory). If you are reconfiguring the affinity setting and leave the array empty, any existing affinity is removed. See the Resource Management Guide for a discussion of NUMA nodes and affinity.