Performance Measures Summary field descriptions
The table below describes each field in the Performance Measures Summary Section of the Performance Summary Report.
Field | Description |
|---|---|
CPU UTILIZATION % BY PROCESSOR TYPE | LPAR CPU busy percentage of standard CPs, zAAPs, and zIIPs; the formula is percentage of busy time / online time MVS CPU busy percentage of standard CPs, zAAPs, and zIIPs; the formula is
The LPAR CPU Utilization calculation includes the WAIT state as well as these additional states:
The MVS view of the CPU utilization is a much better and more direct indicator of a CPU bottleneck. The LPAR view is important with respect to capacity aspects and workload management. MVS BUSY time can be higher than the LPAR BUSY time, and the difference between them is an indication of CPU constraints in the system--the larger the difference, the larger the effects of the constraints. |
AVERAGE CPU QUEUE DEPTH | average number of dispatchable address spaces waiting for CPU |
TIME CPU QUEUE EXISTED (PERCENT OF SAMPLES) | percentage of time that address spaces were found dispatchable and waiting for CPU |
TOTAL I/O INTERRUPT RATE FOR ALL CPU’S | rate per second at which I/O interrupts were handled |
SSCH INSTRUCTIONS PER SECOND | average number of SSCH instructions per second This value is based on the SMF type 74 device records and is limited by the devices sampled. |
AVERAGE TSO TRANSACTION RATE (TRANS PER MINUTE) | average number of TSO transactions per minute This field measures commands typed at the READY prompt and TSO-in-batch jobs. It ignores commands issued within ISPF (except EDIT and TEST). |
AVERAGE NUMBER OF TSO USERS | average number of TSO users logged on simultaneously |
PAGING RATE (PAGES PER SECOND) | total paging rate, in pages per second, between auxiliary storage and central storage, including VIO, swap, hiperspace, and block paging |
SWAP RATE (SWAPS PER MINUTE) | average number of swaps to auxiliary storage per minute |
AVERAGE PRIVATE AREA WORKING SET (PAGES) | average working set size for storage obtained in private area in pages |
AVERAGE JES SPOOL SPACE USED | average percentage of JES spool space used |
MOUNTS, MAX CONCURRENTLY ALLOCATED | for each type of tape drives observed (3490, 3590, ...), the number of mounts that occurred and the maximum number of tape drives allocated simultaneously |
COUNT OF REEL VOLUMES MOUNTED | total number of reel mounts that occurred, including all mounts and any remounts of the same tape volume |
COUNT OF CARTRIDGE VOLUMES MOUNTED | total number of cartridge mounts that occurred, including all mounts and any remounts of the same tape volume |
MAXIMUM 3420 DRIVES CONCURRENTLY ALLOCATED | maximum number of 3420-type tape drives allocated simultaneously |
MAXIMUM 3480 DRIVES CONCURRENTLY ALLOCATED | maximum number of 3480-type tape drives allocated simultaneously |
MAXIMUM 3490 DRIVES CONCURRENTLY ALLOCATED | maximum number of 3490-type tape drives allocated simultaneously |
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