The SMFBJT query generates several chart sets. The chart sets show the daily top nn (default 10) system address spaces (SASs) using CPU, I/O, and central storage (memory) resources on your z/OS systems. For each resource type, one chart set shows the top ten SASs using the resource over the entire Central Processing Complex (CPC), and another that shows the top ten SASs for each z/OS system. The query reads detail data from the BAT_SA (System Address Space Activity) file, and summarizes the data by job name. The charted data reflects summarized interval and step record information from all job steps for the top ten system address spaces.
Note: While the chart samples displayed in this guide present the Top nn system address spaces alphabetically, from left to right on the x-AXIS, the query has been updated to present the Top nn system address spaces in order of descending resource use. The name of each system address space is prefixed with the resource usage rank. (for example, 01- jobnamea, 02- jobnameb, and so on.
For CPU, the CPU time used by each of the top ten SASs is displayed using a vertical bar. The bar is segmented by CPU time type (for example, TCB, SRB, I/O Interrupt, zIIP, zAAP, and so on). Two horizontal lines show the program count (number of unique program executions) and interval count (number of interval records) encountered for the SAS. System address spaces are the first address spaces that initiate on a z/OS system. These address spaces tend to remain up until the system is brought down. In general, the only data processed is interval records. The program count is zero and the interval count identifies the number of individual detail records processed.
Note: The program count data element (PGMCOUNT) is only set to one (1) for the last interval record for a long running system address space.
For I/O, I/O Service Units are used to determine the top ten SASs. Unlike the other address space types (for example, batch, TSO, and so on), there is no device-specific information available for SASs. The only I/O related information is I/O service units. The device connect time and device EXCP views generated for the other Top 10 queries are not available for this SMFSAT query. The I/O service units for the top ten SASs are displayed using vertical bars. As with the CPU chart, the program and interval record count are shown using a horizontal line.
For central storage, the top ten SASs with the largest average working set size are displayed. Average working set size is the average number page frames in central storage used by the program. The page frame count is shown using a vertical bar and the program and interval record count are shown using a horizontal line.
Note: The average working set size represents the average for all step and interval records encountered for each top ten system address space.
The example shows the CPC level chart generated for the system address spaces executing on an IBM z10 2097-407 CPC. The two largest users of CPU time were ‘CONSOLE’ and ‘GRS.’ ‘CONSOLE’ primarily consumed TCB CPU time. The ‘GRS’ system address space consumed more SRB and I/O Interrupt CPU time than TCB time, indicating significant I/O activity.
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