Tandem Capacity Model (TCM) Manual

8 Workload Apportionment Model
This chapter describes the screens and menus of the Workload Apportionment model.
To move from one screen to the next, select the name of the screen you want to view from the Find
menu.
The WA model consists of the following major screens:
• Category Demand Report—provides a summary of the performance data for process categories
as summarized by MeasTCM on the NonStop host system. (See Chapter 3: “Using MeasTCM”.)
Performance data is loaded using the Load Category Data option on the Update tab or
specified when the WA model is first created.
• Workload Apportionment—is used to apportion the CPU and disk seconds consumed by
process categories to transactions. The three screens in this area are: CPU, Disk Read, and
Disk Write.
• Workload Summary—summarizes the results of Workload Apportionment and displays the
CPU and disk seconds for each transaction. In addition, it indicates the fixed consumption
per second.
• TCM Parameters—is used to set various parameters for the WA model and to change default
process category priorities.
• Apportionment Weights Table—is used to define the way in which process category
performance data should be apportioned to transactions. This table is created and modified
only by users with a TCM administrator or superuser authorization level.
• Transaction Count Table—is used to define how TCM should calculate the number of
transactions from process category performance data. The table specifies how to compute the
number of transactions from the number of messages received, sent or both by process
categories. This table is created and modified only by users with a TCM administrator or
superuser authorization level.
Instead of using the Transaction Count table to compute the number of transactions, you can
use a Transaction Count file. For more information, see “Transaction Count Table Versus
Transaction Count File” (page 120).
• Workload Detail by Category—shows detailed information about process categories, CPU
consumption by transaction, category priority, disk process priority queuing, and CPU tunability.
• Capacity History—is a database used to archive and organize apportionment data from the
WA model. Capacity history is organized as an Excel database and presents information that
is useful to the capacity planner for tasks such as verifying transaction consistency, trend
analysis, and selection of representative samples.
Each of the screen descriptions shows a sample screen and describes the significant rows and
columns.
Data Source
The source of the data for the WA model is the process category performance data collected on
the NonStop host system using Measure and summarized by MeasTCM. The MeasTCM file is
created on the NonStop host system and downloaded to the PC.
To download performance data samples to the PC, follow the download procedure you normally
use in Windows. Keep all CSV files for the same application or set of applications in the same
folder. All CSV files must have the extension .CSV.
To load the downloaded performance data into TCM, specify the performance data when you
create a new WA model or choose Load Category Data option from the Update tab.
106 Workload Apportionment Model