To help you to interpret the profiling data, you can choose one or more Data Interpretation options from the Profiling Data menu. These options are:
- Ignore Holes in Trace
Instructs RealView Debugger to ignore holes in the trace data caused by discontinuities. Discontinuities might occur, for example, when the processor is in debug state, or when tracing is disabled. When this option is selected, holes are not included in the whole time used to calculate the values for Exec% and B=>E%.
- Use Logarithmic Scale for Histogram
When this option is selected, the length of the histogram bar is calculated using a logarithmic function of the Exec% or B=>E% value. When this option is disabled, a simple linear scale is used.
- Parent/Child %ages Relative to Whole Time
Enables you to specify the value that time percentages are calculated relative to. When this option is selected, the values shown for Exec% and B=>E% for parents and children are shown as a percentage of the whole time traced. This setting is the default.
See Viewing the Parent/Child %ages Relative to Whole Time for detailed information on how to interpret call-graph data when this option is selected.
- Parent/Child %ages Relative to Function B=>E
Enables you to specify the value that time percentages are calculated relative to. When this option is selected, the values shown for Exec% and B=>E% for parents and children are shown relative to the total B=>E time of the function.
See Viewing the Parent/Child %ages Relative to Function B=>E for detailed information on how to interpret call-graph data when this option is selected.
- Parent/Child %ages Relative to Parent/Child B=>E
Enables you to specify the value that time percentages are calculated relative to. When this option is selected, the values shown for Exec% and B=>E% for parents and children are shown relative to the B=>E time of the parents and children.
See Viewing the Parent/Child %ages Relative to Parent/Child B=>E for detailed information on how to interpret call-graph data when this option is selected.
Note
B=>E refers to Beginning to End.
This is the default view. When this option is selected, the
values shown for Exec% and B=>E% for parents
and children are shown as a percentage of the whole time traced. Figure 9.22 gives an example
of call-graph data for a function with its parents and children.
In this example, when Parent/Child %ages Relative to Whole Time is selected:
The
Exec%column shows that:2.36% of the total execution time was spent in code of the function
Proc_6when called from the parentProc_1.2.43% of the total execution time was spent in code of the function
Proc_6when called from the parentProc_2.4.79% of the total execution time was spent in code of the function
Proc_6.0.53% of the total execution time was spent in code of the function
Func_2when called as a child fromProc_6.1.07% of the total execution time was spent in code of the function
Func_3when called as a child fromProc_6.
The
B=>E%column shows that:3.15% of the total execution time was spent in calls to function
Proc_6and its children when called from the parentProc_1.3.24% of the total execution time was spent in calls to function
Proc_6and its children when called from the parentProc_2.6.39% of the total execution time was spent in calls to function
Proc_6and its children.0.53% of the total execution time was spent in code of the function
Func_2and its children when called as a child fromProc_6.1.07% of the total execution time was spent in code of the function
Func_3and its children when called as a child fromProc_6.
The
Countcolumn shows that:There were 39 calls from the function
Proc_1to the functionProc_6.There were 110 calls from the function
Proc_2to the functionProc_6There were 149 calls to the function
Proc_6.There were 29 calls to the function
Func_2from the functionProc_6.There were 149 calls to the function
Func_3from the functionProc_6.
When this option is selected, the values shown for Exec% and B=>E% for
parents and children are shown relative to the total B=>E time of
the function. Figure 9.23 gives
an example of call-graph data for a function with its parents and
children.
In this example, when Parent/Child %ages Relative to Function B=>E is selected:
The
Exec%column shows that:36.93% of the total time spent in Proc_6 and its children was spent in
Proc_6when called fromProc_1.38.03% of the total time spent in
Proc_6and its children was spent inProc_6when called fromProc_2.8.29% of the total time spent in
Proc_6and its children was spent inFunc_2when called fromProc_6.16.74% of the total time spent in
Proc_6and its children was spent inFunc_3when called fromProc_6.
Note
These four figures add up to 100% because the total time spent in
Proc_6and its children is divided between the time spent inProc_6when called from its parents, and the time spent in the children when called fromProc_6. This is because, in this example, there are no grandchildren.The
B=>E%column shows that:49.30% of the total time was spent in
Proc_6and its children whenProc_6was called fromProc_1.50.70% of the total time was spent in
Proc_6and its children when Proc_6 was called fromProc_2.8.29% of the total time spent in
Proc_6and its children was spent inFunc_2and its children when called fromProc_6.Note
This figure is the same as that in the Exec% column only because there are no grandchildren.
16.74% of the total time spent in
Proc_6and its children was spent inFunc_3and its children when called fromProc_6.Note
This figure is the same as that in the Exec% column only because there are no grandchildren.
Note
The value for the parents always totals 100%. The total time is split between the parents.
When this option is selected, the values shown for Exec% and B=>E% for
parents and children are shown relative to the B=>E time of the
parents and children. Figure 9.24 gives an example of call-graph data for
a function with its parents and children.
In this example, when Parent/Child %ages Relative to Parent/Child B=>E is selected:
The
Exec%column shows that:10.30% of the total time spent in
Proc_1and its children was spent inProc_6when called fromProc_1.38.40% of the total time spent in
Proc_2and its children was spent inProc_6when called fromProc_2.50.00% of the total time spent in
Func_2and its children was spent inFunc_2when called fromProc_616.74% of the total time spent in
Func_3and its children was spent inFunc_3when called fromProc_6.
The
B=>E%column shows that:13.74% of the total time spent in
Proc_6and its children was spent inProc_6and its children when called fromProc_1.51.20% of the total time spent in
Proc_6and its children was spent inProc_6and its children when called fromProc_2.50.00% of the total time spent in
Proc_6and its children was spent inFunc_2and its children when called fromProc_6.Note
This figure is the same as that in the Exec% column only because there are no grandchildren.
16.74% of the total time spent in
Proc_6and its children was spent inFunc_3and its children when called fromProc_6.Note
This figure is the same as that in the Exec% column only because there are no grandchildren.
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