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Chapter 8: Making Software Performance Measurements
Activity Performance Measurements
To interpret activity measurement reports
• View the performance measurement report.
Activity measurements are measurements of the number of accesses (reads or
writes) within an address range. The reports generated for activity measurements
show you the percentage of analyzer trace states that are in the specified address
range, as well as the percentage of time taken by those states. The performance
measurement must include four traces before statistics (mean and standard
deviation) appear in the activity report. The information you will see in activity
measurement reports is described below.
Memory Activity All activity found within the address range.
Program Activity All activity caused by instruction execution in the address
range. Program activity includes opcode fetches and the cycles that result from the
execution of those instructions (reads and writes to memory, stack pushes, etc.).
Relative With respect to activity in all ranges defined in the performance
measurement.
Absolute With respect to all activity, not just activity in those ranges defined in
the performance measurement.
Mean Average number of states in the range per trace. The following equation is
used to calculate the mean:
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