WLM Component of CPExpert
In 1994, IBM began delivering the Workload Manager as a part of the new MVS/ESA SP5.1 operating system release. The Workload Manager provides a radical departure from earlier IBM operating system software. With the Workload Manager, users no longer provide detailed instructions to the System Resources Manager about how to process work. Instead, users partition their workload into service classes, and specify performance goals for each service class.
In 1995, the WLM Component of CPExpert was introduced, to analyze performance aspects of MVS environments running under IBM’s Workload Manager.
The WLM Component analyzes data recorded in standard SMF records (and placed into a performance data base, by MXG® or CA-MICS™ ). The SMF data is analyzed to:
The WLM Component also evaluates overall system
The WLM Component is normally executed each day, as a final step in the daily update of your performance data base.
For those performance analysts who have a good grasp of Workload Manager concepts, constraints, and analysis techniques, the WLM Component can significantly reduce the time required to perform daily analysis of system performance.
Since only problem situations are reported by the WLM Component, performance analysts can focus on problems and not waste time analyzing nonproductive areas.
Users typically find that a number of problems are initially identified by CPExpert. These problems usually are resolved within a fairly short time. If the problems cannot be resolved (for example, because of "political" realities), the guidance provided to CPExpert usually is changed.
The result is that during normal day-to-day operation, the WLM Component should provide an indication of a problem only if the problem is "new" - that is, the system or workload changes and a new problem is encountered or has a more significant impact on the performance of service classes.
The WLM Component User Manual provides a detailed description of each finding, and suggests alternative ways to correct the potential problem. The User Manual provides comprehensive documentation about Workload Manager concepts, algorithms, and operational features.
CPExpert is continually enhanced, with updates every 6 months. These updates provide support for new releases of IBM operating systems and provide additional analysis of performance problems.
Last updated by Don Deese on 03/26/13.