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Making Software Performance Measurements
To interpret activity measurement reports
Standard Deviation Deviation from the mean of state count. The
following equation is used to calculate standard deviation:
Where:
N
Number of traces in the measurement.
mean
Average number of states in the range per trace.
S
Sum of squares of states in the range per trace.
sumq
Symbols Within Range Names of other symbols that identify
addresses or ranges of addresses within the range of this symbol.
Additional Symbols for Address Names of other symbols that also
identify this address.
Note that some compilers emit more than one symbol for certain addresses.
For example, a compiler may emit "interrupt_sim" and "_interrupt_sim" for
the first address in a routine named interrupt_sim. The analyzer will show
the first symbol it finds to represent a range of addresses, or a single address
point, and it will show the other symbols under either "Symbols within range"
or "Additional symbols for address", as applicable. In the "interrupt_sim"
example, it may show either "interrupt_sim" or "_interrupt_sim" to represent
the range, depending on which symbol it finds first. The other symbol will be
shown below "Symbols within range" in the report. These conditions appear
particularly in default measurements that include all global and local symbols.
Relative and Absolute Counts Relative count is the total number of
states associated with the address ranges in the performance
measurement. Relative time is the total amount of time associated with
the address ranges in the performance measurement. The absolute
counts are the number of states or amount of time associated with all the
states in all the traces.
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