You can also plot the residence time for a specified interactive image. The residence time is the time, in seconds, between image activation and image termination. This information can help you track images that consume a fixed amount of resources, such as a database update. Changes in the affect the residence time of jobs that use a fixed amount of resources.
In the CPU Utilization histogram, interrupts (designated by “X”) used approximately 5 percent of the CPU, interactive jobs used 10 percent of the CPU, and batch jobs used 85 percent of CPU at approximately 11:30 a.m. on October 1, 2007.
An asterisk (*) appears in the histogram if there is a discrepancy between the total CPU utilization and the utilization accounted for by processes. This can happen if the image activation rate is high and the Performance Agent cannot capture all of the image activity.
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