The 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 could use a significant amount of system time, which could lead to the system appearing to run more slowly. A rapid sampling clock could jeopardize the system's real-time requirements.