Comparing Activities

Opening the Hotspots Comparison Browser

From the Performance Explorer right click an Activity and select either Compare with baseline or Compare with previous.

Another way to compare Activities is to select two activities in the Performance Explorer, right click, then select Compare.

Comparing Functions between Two Activities

The Hotspots Comparison Browser is used to compare the performance of the application between two Activities. This is useful to determine how a change has affected the application's performance.

At the top of the browser the overall performance change is stated.

The table lists the functions that have had the largest impact on the change to the application's performance.

Each function has the following information:
  • Function name.
  • Relative speedup when comparing the function between the two activities. This shows how much each individual function has either sped up or slowed down between the Activites.
  • Impact score. This shows the impact each function has had on the overall application performance. For example: a function that is called very often may have become only slightly faster, but since it is called so often its cumulative performance impact may be large.
  • Source file where the function definition is located.
  • Binary module that contains the compiled function. A "delta" icon will be shown if compiler options have changed between the Activities.
Note: For COBOL applications, the listed functions will include your procedures as well as functions from the COBOL runtime.

Comparing Environment Variables

The runtime behaviour of the application can be effected by certain environment variables set on the system. An extra panel will be available if changes to these environment variables are detected. Click the small arrow to expand the panel, this will display a table that shows the name of each environment variable and its value in each run. For a list of the relevant environment variables please refer to the page on environment variables for performance tuning.


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