The CPU timer described in CPU Cycle Counter is applicable for homogenous systems only. Specifically, the CPU frequency should match across the systems.

For heterogeneous systems with different CPU frequencies, a special

Normalized CPU timer

(

VT_TIMER=CPU_Norm

) can be used. This timer is based on the

Timer Stamp Counter

(TSC) CPU ticks as well as the original CPU timer (

VT_TIMER=CPU

). The normalized timer converts the local CPU ticks into microseconds on the fly to allow usage of TSC on heterogeneous systems.