HP Caliper User Guide Release 5.5 (5900-2351, August 2012)

pmu_trace Measurement Report Description
With the pmu_trace measurement, produced by the pmu_trace measurement configuration file,
HP Caliper measures traces of sampled PMU data associated with the application for each kernel
thread. This data includes cache misses, TLB misses, ALAT misses, branch mispredictions, instruction
addresses, and CPU events.
These metrics are sampled using the processor's performance monitoring unit (PMU). The number
of metrics HP Caliper can accumulate during a single run of your application is constrained by
the underlying PMU. These constraints are described in the pmu_trace measurement configuration
file.
The CPU events you can choose from are listed in the file itanium2_cpu_counters.txt,
located in the HP Caliper home directory in the doc/text subdirectory.
For the CPU events applicable for Intel® Itanium® 9500 processors, refer to the Intel's Software
Optimization Guide for Intel® Itanium® 9500 processors.
The pmu_trace measurement always reports kernel-thread data whether the --thread option
is specified or not.
Example Command Line for Text Report
$ caliper pmu_trace -o reports/samplecpu.txt ./wordplay thequickbrownfox
Example Command Line for CSV Report
$ caliper pmu_trace --csv csvout ./wordplay thequickbrownfox
scgprof Measurement Report Description
With the scgprof measurement, produced by the scgprof measurement configuration file, HP
Caliper measures and reports both flat and call graph profiles (much like standard gprof).
The call graph is produced by statistical sampling of the processor's performance monitoring unit
(PMU) to determine function calls in an application. The call graph is not exact, because it does
not show every function call, but it is statistically useful.
Example Command Line for Text Report
$ caliper scgprof -o reports/scgprof.txt ./wordplay thequickbrownfox
Example Command Line for CSV Report
$ caliper scgprof --csv csvout ./wordplay thequickbrownfox
scgprof Measurement Report Metrics (Flat Profile)
Table 29 (page 223) shows the information found in Sampled Call Graph Profile reports.
In this table, “program object” refers to any of the following:
• Load module
• Function
• Source statement
• Instruction bundle
The numbers of calls in the descriptions are smaller than the actual calls made by the application,
because the call graph is produced by sampling.
222 Descriptions of Measurement Reports