Performance monitoring using the WebSphere Commerce PMI module

You can monitor the performance of your WebSphere Commerce system by using the WebSphere Application Server Performance Monitoring Infrastructure (PMI). The function of the previous WebSphere Commerce performance monitor has been transferred to the WebSphere Commerce PMI module. Performance data can be monitored and analyzed with a variety of tools available from WebSphere Application Server. Site Administrators can use the information gathered from the tools to detect performance problems and analyze performance trends. The tools can be used for measuring the performance of a WebSphere Commerce application server from a local or remote machine.

The WebSphere Commerce application server gathers statistics for URLs, tasks, and views. Each data key has an associated set of counters that provide information on such things as average response time of a task, maximum and minimum response times, the total number of times a task was called, and so on.

To set up the WebSphere Application Server PMI, see the section "Monitoring performance" in the WebSphere Application Server Information Center.

After you have started the Tivoli Performance Viewer, from the Resource Selection panel, expand Commerce Counter Group. The data will be grouped according to Tasks, URLs, and Views under the Store ID. Note that all the task commands are found only under StoreId=0. Once a particular URL, View or Task command is selected from the Resource Selection Panel, the Counter Selection Panel will display the WebSphere Commerce counter.

These are the counters that are included for each task, URL, or view. Note that all timing values are elapsed time (usually in milliseconds where appropriate):

Counter Name
Definition
Average response time
Average response time of task
Last response time
The last response time of a task.
Minimum response time
Minimum response time of a task.
Maximum response time
Maximum response time of a task.
Hits
The total number of times a task was called.
Total response time
Total response time of a task.
Standard deviation
Standard deviation of response time. The formula used to calculate the standard deviation assumes that the data conforms to a standard distribution.

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