CPU

The CPU service provides information about job activity by noting the proportionate use of CPU resources by job.

Related topic

Services

Use CPU to monitor system activity.


Important

The CPU service includes a job's ASSBASST field, which represents the CPU time consumed by preemptible SRBs running in the job. For information about the JCPU service that uses a job's ASSBPHTM field, see JCPU.

Syntax

GUID-1814C3AA-676C-4565-A14B-0A12A92B000D-low.pngThe parameter is defined as follows:

Parameter

Description

time

Length of the sample period is in seconds.

The default value is 10. The maximum value is 1,200.

Example

To display information about CPU usage for the past 10 seconds, type

CPU, 10

 AMTOB7I Collecting CPU data for 10 seconds                      
 AMTOB1I Plex Busy         90.2% [1]
 AMTOB1I Plex Wait          6.0% [2]
 AMTOB1I Plex Overhead      3.8% [3]
                          [4]
 AMTOB1I Partition Rcvd.    2.3% which is                        
                          [5]
 AMTOB1I                   52.2% of its Relative Share (of 4.4%)
 AMTOB0I                                                         
 AMTOB3I                    Used  Priority   Part. Rcvd.         
            [6]   [7]        [8]    [9]
 AMTOB4I    STC WLM         8.6%  FF (255)      .38%             
 AMTOB4I    STC RMFGAT      6.4%  E8 (232)      .28%             
 AMTOB4I    STC C500M       5.0%  E8 (232)      .22%             
 AMTOB4I    STC SQNCAS      2.1%  E8 (232)      .09%             
 AMTOB4I    STC XCFAS       1.9%  FF (255)      .08%             
 AMTOB4I    TSO BMVHTR3     1.9%  FF (255)      .08%             
 AMTOB4I    STC C600M       1.7%  E8 (232)      .07%             
 AMTOB4I    STC GRS         1.0%  FF (255)      .04%             
                           [10]
 AMTOB5I All others used   23.6%               1.03%             
                           [11]
 AMTOB6I TOTAL USED        52.2%               2.30%             
 AMTOB0I                                                         
 AMTOB2I Batch= 1.0%, STC= 95.1%, TSO= 3.9%, Total=100.0% [12]
 AMTOB0I                                                         
 AMTOBTI Sample begin time 11:50:41.596                          
 AMTOBTI Sample end time   11:50:51.597

Legend:

  1. Percentage of the sample period that the sysplex was performing useful work
  2. Percentage of the sample period that the processors were not dispatched to a partition because the partitions were waiting
  3. Percentage of the sample period used by the hardware to dispatch processors to partitions

  4. Percentage of the sample period that the partition hosting the SYSPROG Services session was dispatched

    Subtracting this percentage from the PLEX BUSY percentage yields the percentage of the sample that all other partitions in the sysplex were dispatched.

  5. Percentage of the partition’s relative share (the amount of processing time that the partition is supposed to receive when the partition’s demands are high and resources are limited) used during the sample period

    When the partition can use more time and time is available, it can exceed 100 percent of its relative share. Likewise, the partition can (when wait assist is off) receive less than its relative share.

  6. Type of address space: a batch job (JOB), Started Task (STC), or TSO session (TSO)

  7. Names of the address spaces that consumed the highest percentage of the total CPU used by the LPAR during the sampling period, listed in descending order of CPU utilization

    Address spaces that use less than one percent are not listed. Up to ten address spaces are listed.

  8. CPU usage by address space
  9. Priority of the address space
  10. CPU usage for all other address spaces in the LPAR
  11. Sum of CPU usage for all address spaces in the partition during sample interval; sum is equal to the partition’s relative share usage (56.8 percent in this example)
  12. Usage distribution among batch jobs, Started Tasks, and TSO sessions

 

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