If you analyze your target several times using the
same analysis type or different analysis types with the same metrics, you can
use the
Compare Results
button to
compare the results.
Intel® VTune™ Amplifier opens a new tab. The tab name combines the identifiers of two results. For example, the comparison of the Concurrency analysis results r001cc and r005cc appears as r001cc-r005cc. The data views in the comparison mode provide the calculation of the difference between the two results that is calculated as you originally defined in the Compare Results window and as specified in the tab title.
Use this feature on a regular basis for regression testing to quickly see where each version of your target has better performance.
Use this window: |
To do this: |
|---|---|
Analyze the difference in the overall application performance between two results and the system/platform difference, if any. Start exploring the changes from the Summary window and then move to the Bottom-up analysis to identify the changes per program unit. |
|
Analyze the data columns of the two results and a new column with the difference between these results for a function and its callers. |
|
Compare results and identify the difference in event count and performance per hardware event-based metrics collected during event-based sampling analysis. |
|
Explore the performance difference between two collection runs for a function and its callees. |
|
Get a holistic picture of the performance changes before and after optimization by comparing data for a function, its callers and callees. |
|
Understand how differently input values, command line parameters, or compilation options affect the performance when you are optimizing your target. Double-click a program unit of your interest and compare the performance data for each line of the source/assembly code. |
You can compare any results that have common performance metrics. Intel® VTune™ Amplifier will provide comparison data for these common metrics only.
To compare two analysis results:
Click the
Compare Results button from the VTune Amplifier toolbar.
TheCompare Results window opens.
Specify two results that you want to compare and click Compare the command tollbar button on the right.
A new result tab opens providing difference between the two results per performance metrics.