User`s guide

Real-Time Analysis
Instrumentation 3-3
a balance between program perturbation and recording sufficient information.
Limited instrumentation provides inadequate detail, but excessive
instrumentation perturbs the measured system to an unacceptable degree.
DSP/BIOS provides a variety of mechanisms that allow you to control
precisely the balance between intrusion and information gathered. In
addition, the DSP/BIOS instrumentation operations all have fixed, short
execution times. Since the overhead time is fixed, the effects of
instrumentation are known in advance and can be factored out of
measurements.