Transaction dispatch time and CPU time

The transaction total CPU time field USRCPUT, field 008 in group DFHTASK, is the total processor time during which the user task was dispatched by the CICS dispatcher domain on each CICS TCB under which the task executed. Where a task executed on a specialty processor, a fraction of this field may be normalized to reflect the relative speed of the general processor compared with the specialty processors. See Relating CICS transactions to hardware resources for a description of the normalization process.

For both these fields, the time recorded in the field can be associated with any of the TCB modes which are managed by the CICS dispatcher in the current CICS release. These include open TCBs, such as L8 mode TCBs, as well as non-open TCBs, such as the QR TCB. Be aware that for each CICS release, new TCB modes might be added or obsolete TCB modes might be removed, particularly in the case of the open TCB modes. You should always check the performance data field descriptions in the current release documentation to see which TCB modes are applicable. The field descriptions are listed in DFHTASK group.

If you want to calculate a transaction's ratio of accumulated CPU time to accumulated dispatch time (CPU/DISP ratio) for the QR TCB, use fields 255 (QRDISPT) and 256 (QRCPUT) in group DFHTASK. These fields show the elapsed time and processor time during which the user task was dispatched on the QR TCB only.

The CPU/DISP ratio for an individual task should always be considered in the context of other activity in the CICS region. The Dispatcher TCB Modes report (see Dispatcher TCB Modes report) which is provided by the sample statistics program DFH0STAT includes a calculation of the CPU/DISP ratio for the QR TCB for the whole CICS region.