System Use Reporting › System Use Report Samples › CPU Activity Graphs

CPU Activity Graphs

This report enables management to identify peak periods of CPU activity and to easily correlate CPU utilization, multiprogramming, and paging activity.

• The scope of the report is displayed in the upper right corner of the report. This can be SHIFT n (n=1 through 3), DAILY, denoting a single day's data, or TOTAL, denoting multiple day's data summarized into one graph.
• Graph titles: the left-hand graph always shows CPU utilization. The right-hand graph defaults to system occupancy, showing the total active and allocation time of all jobs within each time interval. A switch on the SELECT statement causes this graph to show paging activity instead.
• The MP (multiprogramming factor), present on each graph, is an indicator of how busy the machine was during each interval.
• The percentages, that are graphed, represent the total length of the bar, are the total of all programs or jobs shown. FLD1 pertains to the left-hand graph and FLD2 pertains to the right-hand graph.
• The vertical time-of-day axis. The increment for each time interval is specified on the SYSUSE1 statement.
• The number of days on which data was found for each time interval is displayed on the right side of the report. This is shown only for multiday summary reports.
• The LEGEND provides a cross-reference between the percentage columns and the graphs, shows the symbols used on each graph, and gives the meaning of 100 percent for each graph. An entry on the SYSUSE2 statement is available to standardize the scale of the Paging Activity Graph. This scale defaults to the maximum paging activity observed in any time interval.

When the System Occupancy Graph is selected, this same entry on the SYSUSE2 statement may be used to indicate the number of initiators which, if all were active, would represent 100 percent system occupancy. The default assumption is 15 initiators.