System Use Reporting › System Use Report Samples › Computer Utilization Summary

Computer Utilization Summary

This report provides management with a comprehensive one page summary of overall computer utilization, plus basic measurements of operations performance for a user-defined time interval.

• The scope of the report can be SHIFT n (n = 1 through 3) or TOTAL, with the time boundaries of the shift or day (24-hour period) given in the format hh.mm.ss.
• Basic performance statistics are shown in the format hhhh.mm.ss.
• Each number that is used to calculate the performance parameters in the third section is defined by the algorithms provided on the report next to the numbers.

  Note that the total time measured is defined as the difference between A and B of Item D. For reports covering multiple days, the total time measured is the sum of the values (B - A) for each of the days for which data was found.

• The second portion of this report displays job and step statistics along with the number of IPLs performed. Rates per hour are shown in terms of the total time measured, from the first section of this report.
• The interval length for CPU utilization is the number of seconds in the interval times the number of processors in the system. The number of processors in the system is shown at the bottom of the report and can be computed from the RMF type 70 record, or it can come from the OPTION statement.
• Service unit information for z/OS systems is broken down between batch and TSO, both the number of units and the rate in service units per second of active time.
• System wait time comes from the RMF type-70 record. The number of type 70 records used in this report is shown as RMF INTERVALS. If the number of RMF records is less than what it should be (number of RMF records should be the time span of the report / RMF interval time) then the wait time, along with all the fields that use wait time in their calculation, are incorrect. The wait time is itemized by processor when the data for the report comes from a multiprocessor system. The online intervals field is the number of RMF intervals during which the processor was online. If the processor was varied offline, or reconfigured during an interval then the wait time for the interval cannot be used, and again the system wait time may be incorrect.
• Potential time is the total time the system is available times the number of processors in the system. This is the maximum amount of time that the system could be working. The number of processors is computed from the RMF type 70 record, but may be overridden by the number of processors field on the OPTION statement.