HP Caliper User's Guide

fprof Measurement Report Description

With the fprof measurement, produced by the fprof measurement configuration

file, HP Caliper measures and reports sampled instruction pointers (IPs). The fprof

measurement samples the instruction pointer (IP) at a regular interval (that is, at a

particular number of CPU cycles). This provides a statistical identification of where

CPU events are occurring.

The report contains two levels of information:

• Exact counts of CPU metrics summed across the entire run of an application

• Sampled IPs that are associated with particular locations in the application

The default for the fprof measurement is to take a sample every 500,000 +/- 25,000

CPU cycles. (CPU_CYCLES is the event.)

You use the -s (--sampling-spec) option to change both the event being sampled

and the interval. For example, if you want to keep the same variation and sample event

and simply change the interval, you can use the following option: -s 100000. The

sampling rate, variation, and event used are listed in the Sampling Specification part

of the report.

Command-line options allow you to control the amount of data reported, how the data

is sorted, and the number of statements and instructions reported for each sampled

program location.

Example Command Line for Text Report

$ caliper fprof -o reports/sample.txt ./wordplay thequickbrownfox

Example Command Line for CSV Report

$ caliper fprof --csv csvout ./wordplay thequickbrownfox

fprof Metrics Summed for Entire Run

This section describes the metrics summed over the entire run of your application under

HP Caliper.

Metrics for Integrity Servers Itanium 2 Systems

CPU_CYCLES Number of elapsed processor cycles.

BACK_END_BUBBLE.ALL Full pipe bubbles in main pipe.

BE_EXE_BUBBLE.GRALL Full pipe bubbles in main pipe due to execution

unit stalls.

% of Cycles Lost Due to Stalls Percentage of cycles lost due to stalls.

% of Cycles Stalled Due to GR/GR

or GR/Load Dependency

Percentage of cycles stalled due to general

dependency.

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