Using the Information in IWMWRCAA

By using IWMRCOLL, a performance monitor can get the following kinds of information:

• Resource consumption information
• Response time and distribution information
• General delay information
• Subsystem work manager delay state information

The information provided is mapped by the IWMWRCAA data area. Information is returned on a service class and report class basis. The following section explains how to use the response time data and the subsystem work manager delay state information.

• Header Data

  The header data present in the RCAA consists of:

  • Data specific to the workload management mode in effect, such as which service policy is active.
  • General information such as bookkeeping information.
• Resource Data

  Resource information is available for address spaces and there is a distinction between transactions and server address spaces. A server address space is any address space that does work on behalf of a transaction manager or a resource manager. For example, a server address space could be a CICS® AOR, or an IMS™ control region. Service classes that represent CICS or IMS transactions, as opposed to address spaces, have no resource data. The resources being consumed by such transactions are reported in the service class of the server address space.

• Delay Data

  There are two types of delay information returned by IWMRCOLL: general execution delays, and subsystem work manager delays. All data is sampled.

  The general execution delays are address space oriented while the subsystem work manager execution delays are service class oriented. They show delays encountered by service classes representing transactions. The subsystem work manager execution delays are in the subsystem work manager state samples section of IWMWRCAA. The state samples are available only for subsystem work managers using the execution delay monitoring services.

  In order to determine whether a service class has execution delay state sampling information, the header data indicates which type of delay information is available for a service class. You can use address space delay data to calculate execution velocity.

• Response Time Data

  There is response time information and response time distributions for transactions. Both are reported for service classes and report classes.

  You can calculate average response times using the information provided in this section. Total completed transactions (both normal and abnormal) are provided, as well as total transaction completion time. This same information is available for the execution phase of transactions.