When you connect the vSphere Client directly to a host, you have access to a limited number of resource management settings, including hyperthreading settings, power management configuration, and swapfile properties.
Configuring Resource Allocation Settings When available resource capacity does not meet the demands of the resource consumers (and virtualization overhead), administrators might need to customize the amount of resources that are allocated to virtual machines or to the resource pools in which they reside.
Administering CPU Resources You can configure virtual machines with one or more virtual processors, each with its own set of registers and control structures.
Administering Memory Resources Using the vSphere Client you can view information about and make changes to memory allocation settings. To administer your memory resources effectively, you must also be familiar with memory overhead, idle memory tax, and how ESXi hosts reclaim memory.
Using NUMA Systems with ESXi ESXi supports memory access optimization for Intel and AMD Opteron processors in server architectures that support NUMA (non-uniform memory access).
Advanced Attributes You can set advanced attributes for hosts or individual virtual machines to help you customize resource management.