System CPU Utilization Workspace

System CPU utilization is the percentage of time that all processors available to a system were busy dispatching work. This workspace provides information about CPU usage for the system. In an LPAR environment, this group also provides partition management statistics.

The System CPU Utilization table view shows the number of physical processors reported on, number of processors online, the average percentage of time that all processors collectively available in this z/OS system were busy dispatching work, and other information specific to CPU workload and partition workload.

The System CPU Utilization table also shows the long-term average CPU service used by this LPAR in millions of service units (MSUs) per hour. Data for this attribute is available only if you have opted to use defined capacity as a basis for pricing.

If CPU utilization information for an address space requires analysis, see Address Space CPU Utilization.

If overall system CPU utilization is too high, you may want to review

In a complex with more than one CPU, the utilization values can be computed based on the total number of processors, or normalized to a maximum of 100%.

The Workload CPU Usage bar chart provides information on CPU workload, showing the percentage of time spent doing SRB work and TCB work, as well as z/OS overhead. The chart permits you to  understand what part of your workload is having the greatest impact on CPU resources.

The Partition CPU bar chart illustrates the percentage of time on average that a logical processor was dispatched in the logical partition during the interval, and the percentage of time on average that a physical processor was dispatched in the logical partition during the interval. For a given partition, when the number of logical processors assigned to a partition is the same as the number of physical processors, the partition's physical and logical CPU utilization should be the same.

This workspace can record history.  

See also:

Organization of system-level predefined workspaces
Attribute groups used by system-level predefined workspaces