Tandem Capacity Model (TCM) Manual

Figure 5 From Process Categories to Transactions
You download the MeasTCM results into the WA model. During the workload apportionment
processing, TCM divides categories into units that are allocated to transactions. After the workload
apportionment process is complete, each transaction has a value for CPU seconds and disk seconds.
If you obtain consistent CPU and disk seconds from the WA model for several Measure samples
with a variety of transaction mixes, you have a reasonable WA model.
You can use a process flow diagram to define the categories and to customize your control file.
Figure 6 (page 33) shows a system-level process flow diagram for a sample application. Each
oval in the figure represents a process category. This application has four transaction types: standard
(ST1), inquiry (INQ), update (UPD), and BIG. The application is described in the following list:
• The server classes for each of the transaction types are ST1, INQ, BIG, and UPD.
• The terminal control process (TCP) for ST1 is ST1_TCP. For INQ, BIG, and UPD, it is ST2_TCP.
• The line handler for ST1 is ST1_LH. For INQ, BIG, and UPD, it is ST2_LH.
• All four transactions share the same disks. DISK is the aggregation of all the disk processes
in the system.
32 Using MeasTCM