HP UX Caliper Software HP Caliper Call Graph Profile Results Accuracy, Call Graph Profile Metrics

HP Caliper Call Graph Profile Results Accuracy

The HP Caliper call graph profile report directly measures call graph data. The number of calls are derived by counting, not sampling. They are completely accurate and will not vary from run to run if your program is deterministic.

The HP Caliper call graph profile report's sampling of IP data is statistical, so you should expect a small variation (less than +/- 5%) in the timing data that HP Caliper collects for different runs of your application.

The times cgprof reports are affected by the instrumentation done to collect the data. The times are inaccurate in absolute terms but valid in relative terms.

HP Caliper accounts for 100 percent of time under main for all applications with 0 (zero) unattributed samples.

An entry called *ROOT* reflects 100 percent of the time for your executable, which represents the time from:

•All the functions with no parents

•Out-of-context modules

•Stub code

Call Graph Profile Metrics

Table 11 (page 176) shows the information found in the flat profile part of a Call Graph Profile report.

In this table, “program object” refers to any of the following:

•Load module

•Function

•Source statement

•Instruction bundle

Table 11 Information in cgprof Measurement Report Fields (Flat Profile)

Column	Description
% Total IP Samples	Percent of the total IP samples attributable to a given program object.
Cumulat % of Total	Running sum of the percent of total IP samples accounted for by the given program object and
	those listed above it.
IP Samples	Total number of IP samples attributed to the given program object.
Secs in Module	Number of seconds accounted for by this load module.
Secs in Func/Module	Number of seconds accounted for by this function/module alone, if this function/module is
	profiled; otherwise blank.
Secs in Proc	Number of seconds accounted for by this process.
Call Count	Number of times this function was invoked, if this function is profiled. Otherwise, blank.
Msecs per Call	Number of milliseconds per function call.
Load Module	Shared library or the main executable.
Function	Routine from your application.
File	Source file associated with a function.

176 Descriptions of Measurement Reports