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Optimizing Citrix® XenDesktop® for High Performance by Craig Thomas Ellrod

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Terminology and concepts

In this section, we will cover some commonly used terminology and concepts used with XenDesktop.

Hyperthreading

Most physical servers designed to be used with a hypervisor include physical CPUs that are capable of hyperthreading. Hyperthreading allows a CPU to be used by more than one process or task at a time. Hyperthreading allows multiple threads to run on each processor core. Simple math would indicate that hyperthreading effectively doubles the CPU count. However, Tribal Knowledge says the extra amount of performance varies, and it is more like a 1.5:1 ratio providing a 20 to 30 percent performance improvement, and not 2:1 with 100 percent performance improvement. A virtual CPU (vCPU) or multiple vCPUs are assigned ...

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