Performance management on IBM i

The Performance Explorer is a data collection and reporting tool that helps performance analysts identify the cause of performance problems that cannot be identified by other tools in the IBM i operating system or by most of the reporting facilities in the Performance Tools for IBM i product. The collection function in the Performance Explorer is included in the IBM i operating system. The reporting function is a special advanced type of performance report that is available only through the Performance Tools for IBM i licensed product. Two reasons to use Performance Explorer are:

  • Isolating performance problems to the system resource, application, program, procedure, or method that is causing the problem.
  • Analyzing the performance of individual applications or key middleware components such as application servers or database servers.

Performance Explorer can be run in several modes, with each mode providing a different view of performance or a different level of detail. The least detailed mode is called *STATS. It is used to identify applications, programs, or modules that consume the most CPU and perform a large amount of disk I/O operations.

The most detailed mode is called *TRACE which gathers a historical trace of performance activity for one or more jobs and tasks on the system. It provides a way to trace various activities called events that occur when applications are running or system resources are being used. Common trace events include:

  • Program and procedure calls and returns.
  • Storage allocations and de-allocations.
  • Disk read and write operations.
  • Java method entry and exit.
  • Java object creates and garbage collection activities.
  • Journal operations such as start commit and end commit.
  • Synchronization activities such as locks and semaphores.
  • Communication events at the TCP, IP, and UDP layers.

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