Key Terms

baseline: A performance metric used as a basis for comparison of the application versions before and after optimization. Baseline should be measurable and reproducible.

Elapsed time: The total time your target ran, calculated as follows: Wall clock time at end of application – Wall clock time at start of application.

Effective time: CPU time spent in the user code. This metric does not include Spin and Overhead time.

event-based metrics: Event ratios with their own threshold values. VTune Amplifier collects event data, calculates the ratios, and provides the results in the corresponding columns of the Bottom-up/Top-down Tree windows and in the Summary window. As soon as the performance of a program unit per metric exceeds the threshold, the VTune Amplifier marks this value as a performance issue (in pink) and provides recommendations how to fix it. For the full list of metrics used by the VTune Amplifier, see the Reference for Performance Metrics chapter in the online help.

event skid: An event detected not exactly on the code line that caused the event. Event skids may even result in a caller function event being recorded in the callee function. See the online help for more details.

finalization: A process during which the Intel® VTune™ Amplifier converts the collected data to a database, resolves symbol information, and pre-computes data to make further analysis more efficient and responsive.

hotspot: A section of code that the processors spend a lot of time executing. Some hotspots may indicate bottlenecks and can be removed, while other hotspots inevitably take a long time to execute due to their nature.

project: A container for an analysis target configuration and data collection results.

target: A target is an executable file you analyze using the Intel® VTune™ Amplifier .

viewpoint: A preset result tab configuration that filters out the data collected during a performance analysis and enables you to focus on specific performance problems. When you select a viewpoint, you select a set of performance metrics the VTune Amplifier shows in the windows/panes of the result tab. To select the required viewpoint, click the (change) link and use the drop-down menu at the top of the result tab.

For more complete information about compiler optimizations, see our Optimization Notice.