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Activity Performance Measurements
Activity measurements are measurements of the number of accesses (reads
or writes) within an address range. The SPMT shows 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. Two types of activity are
measured: memory activity, and program activity.
Memory activity is all activity that occurs within the address range.
Program activity is the 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.).
For example, suppose an address range being measured for activity contains
an opcode that causes a stack push, which results in multiple write
operations to the stack area (outside the range). The memory activity
measurement will count only the stack push opcode cycle. However, the
program activity measurement will count the stack push opcode cycle and
the write operations to the stack.
By comparing the program activity and the memory activity in an address
range, you can get an idea of how much activity in other areas is caused by
the code being measured. An activity measurement report of the code
(prog), data, and stack sections of a program is shown below.
Label
prog
Address Range ADEH thru 1261H
Memory Activity
State Percent Rel = 57.77 Abs = 57.77
Mean = 295.80 Sdv = 26.77
Time Percent Rel = 60.97 Abs = 60.97
Program Activity
State Percent Rel = 99.82 Abs = 99.82
Mean = 511.10 Sdv = 0.88
Time Percent Rel = 99.84 Abs = 99.84
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