Address Space Reports from SMF Data › ERXT0312/EZXT0312: Address Space zIIP CPU Activity

ERXT0312/EZXT0312: Address Space zIIP CPU Activity

This report provides an address space perspective of zIIP processor usage by zIIP and by program name.

zIIP processors are used to offload CPU-intensive work to a special processor that does not "count" as part of the mainfrmae configuration for assessing software costs. zIIP processors are exploited by DB2. This report shows how effectively zIIP processors are being used by address spaces that utilize the specialized processing unit. This report can also be used to evaluate how much workload is zIIP-eligible to determine if it would be beneficial to redirect activity to zIIP processors.

• The first three numeric columns refer to processing that takes place on a standard (CP) processor. If zIIP-eligible processing is a large proportion of total CP processing, you might want to add zIIP capacity.
• The next two columns show zIIP activity on installed zIIP processors.
• The last column is an estimate of how efficiently the DB2 workload was offloaded to zIIP processors:
  • A high percentage means zIIP capacty is adequate.
  • A low percentage, along with high zIIP-eligible work executing on a CP, means that zIIP capacity is not optimal.

For a detailed explanation of how zIIP and zAAP processors are used, the difference between eligible and qualified time, and the "zIIP Generosity Factor," see a paper called zIIPs and zAAPs - Understanding Transaction Flows and CPU Measurements by Peter Enrico in the Proceedings of the 2007 CMG International Conference. CMG members may also find this paper online at www.cmg.org.

1 6/04/07                                         Address Space zIIP CPU Activity                             PAGE      1
 REPORT ID: EZXT0312

                     |--------------------- CP ---------------------|      |----------- zIIP -----------|
                     Total CP          Non-zIIP                                             Normalized
 SYSTEM PROGRAM      Processor         Eligible           TM zIIP          CPU TM on         zIIP CPU         zIIP Use
   ID     NAME         Time            CPU Time            on CP             zIIP              Time          Percentage
0 CA31  DSNUTILB             2.96              1.66              1.30               .20               .20          13.33
                             2.14              2.08               .06               .53               .53          89.83
                             2.09              2.03               .06               .99               .99          94.29
                              .36               .35               .01               .51               .51          98.08
                              .36               .35               .01               .02               .02          66.67
                             1.09               .69               .40              1.53              1.53          79.27
                             2.96              1.96              1.00              1.02              1.02          50.50
                             1.13              1.13               .00               .54               .54         100.00
  CA31  DSNUTILB            13.09             10.25              2.84              5.34              5.34
0 CA31  IEFBR14              1.19              1.19               .00               .20               .20         100.00
                             1.20               .20              1.00               .70               .70          41.18
                             1.20              1.20               .00               .20               .20         100.00
                             1.37              1.37               .00               .38               .38         100.00
                             1.51              1.41               .10               .23               .23          69.70
                             1.54              1.24               .30              1.33              1.33          81.60
  CA31  IEFBR14              8.01              6.61              1.40              3.04              3.04
0 CA31  IKJEFT01              .11               .11               .00               .67               .67         100.00
                              .29               .29               .00               .22               .22         100.00
                              .29               .29               .00               .34               .34         100.00
                             1.03              1.03               .00               .36               .36         100.00
                             1.26              1.26               .00               .82               .82         100.00
                             1.40              1.10               .30               .23               .23          43.40
                             1.80              1.80               .00               .52               .52         100.00
                             1.89              1.89               .00               .38               .38         100.00
                             2.10              2.10               .00               .55               .55         100.00
                             2.13              1.13              1.00              1.32              1.32          56.90