Performance Profiling Clock

While the performance profiler is active, the system is regularly interrupted by the profiling clock (which by default is the system clock). At each clock tick, the instruction pointer is sampled, the active procedure is located, and a counter associated with the interrupted procedure is incremented. A high rate performance profiling clock can use a significant amount of system time, which may lead to the system appearing to run more slowly. A rapid sampling clock could jeopardize the system's real time requirements.