Collecting system service usage information on your
  application is useful for determining where and your
  program calls each system service and what parts of
  your application use system services the most. For each
  system service call, PCA gathers the following data:

  o  The system service index

  o  The PCA address of the system service call

  o  The current process, or CPU, time

  To collect system service usage information on your
  application:

  o  Compile and link your application with the PCA
     Collector

  o  Run your application. This causes the PCA Collector
     to take control of your application. PCA diplays the
     Collector main window on your screen.

  o  From the File pull-down menu, create a data file
     into which the Collector places performance data.

  o  Choose the System Service Uages query category.

  o  Click on the specific system service usage query
     that you are interested in collecting information
     on.

  o  Click on Collect in the Collector main window.

  For information on displaying the results of the system
  service usage queries, refer to:

  o  The hardcopy manual, Guide to DIGITAL Performance
     and Coverage Analyzer for OpenVMS Systems

  o  The online help for the PCA Analyzer.