You optimized your code to apply a loop interchange mechanism that gave you 19.633 seconds of improvement in the application execution time. To understand whether you got rid of the hotspot and what kind of optimization you got per function, re-run the Basic Hotspots analysis on the optimized code and compare results:
Compare Results Before and After Optimization
VTune Amplifier collects data and opens the result in the Result tab. Make sure to close the results before comparison.
Identify the Performance Gain
In the Summary window, you see that the Elapsed time shows 19.633 seconds of optimization for the whole application execution:
The Top Hotspots section shows the gain in performance for the most critical functions:
Switch to the Bottom-up window to compare the two results and see the differences per metrics side by side.