The SMFTUT query generates several chart sets. The chart sets show the daily top nn (default 10) TSO users based on use of CPU, I/O, and central storage (memory) resources on your z/OS systems. For each resource type, one chart set shows the top ten TSO users using the resource over the entire Central Processing Complex (CPC), and another that shows the top ten TSO users for each z/OS system. The query reads detail data from the BAT_TS (SMF User TSO Activity) file, and summarizes the data by User Identification. The charted data reflects summarized interval and step record information from all TSO sessions for the top ten TSO users.
Note: While the chart samples displayed in this guide present the Top nn TSO users alphabetically, from left to right on the x-AXIS, the query has been updated to present the Top nn TSO users in order of descending resource use. The name of each TSO user is prefixed with the resource usage rank. (for example, 01- jobnamea, 02- jobnameb, and so on.
Note: The user identification field, RACFUSID, implies RACF, but the user ID information is present even if other non-RACF security systems are used.
For CPU, the CPU time used by each of the top ten TSO users 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 TSO sessions) and interval count (number of interval records) encountered for the user. For short running TSO sessions, the interval count and program count values have similar values. For long running sessions, the interval count exceeds the program count.
Note: The program count data element (PGMCOUNT) is only set to one (1) for the last interval record for a long running TSO session. For long running sessions that has not yet ended, PGMCOUNT is zero.
For I/O, I/O Service Units are used to determine the top 10 TSO users. Three different chart views are available to display I/O related resource utilization. The first view shows I/O service units for the top ten using vertical bars. The second view displays device connect time for the top 10 by device class (for example, DASD, TAPE, Unit Record, and so on). The device connect time is displayed using a vertical bar, with the bar segmented by the time connected to each of the device classes. The final view shows EXCPs by device class, again using a segmented vertical bar. As with the CPU chart, the program and interval record count are shown using a horizontal line.
For central storage, the top ten TSO users with the largest average working set size are displayed. Average working set size is the average number page frames in central storage used during the TSO session. The page frame count is shown using a vertical bar and the session 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 TSO user.
The example shows the CPC level chart generated for jobs executing on an IBM z196 2817-615 CPC. The largest TSO user of CPU time was ‘LTUSR1A’. The chart shows that for the day depicted, the user had 4 TSO sessions completed spanning 15 interval records, and consumed almost 30 minutes of CPU time. Most of this time was Normalized zIIP CPU Time. The normalization of zIIP CPU time is important for this CPC model because the CP engines run slower than the specialty (zIIP/zAAP) engines. When zIIP or zAAP CPU time is normalized, the value is expressed as the CP engine equivalent by multiplying by a normalization factor. For the 2817-615 CPC model, the normalization factor is 1.52734.
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