2. PERFORMANCE REPORTING ANALYSIS › 2.9 WLM Goal Mode Analysis › 2.9.2 Usage Guidelines › 2.9.2.2 Workload Related Metrics

2.9.2.2 Workload Related Metrics

CPU Usage     The ratio of CPU Using Samples to the sum of
Delay Ratio   CPU Using and CPU Delay Samples. This is a
              relative measure of how much the defined
              workloads are waiting for processor dispatch.
              When this value is more than 0.50, then the LP
              Related metrics should be examined closely to
              better understand how much the performance is
              being affected by the lack of processor
              resources.

zAAP Usage    The ratio of IFA Using Samples to the sum of
Delay Ratio   IFA Using and IFA Delay Samples. This is a
              relative measure of how much the defined
              workloads are waiting for IFA processor
              dispatch. Because the zAAP technology is
              relatively new, no firm guidelines have yet
              been established for determining when a
              performance impact might occur. However, given
              the nature and use of zAAP engines, a value of
              0.20 might be cause for concern and could lead
              you to consider other performance
              measurements.

              While the performance metrics for zAAP usage
              are basic in nature, understand that the LP
              weight is used to manage the zAAP engines as
              well as CPs. Specifying a low LP weight value
              will not only cause the CPs defined to be
              minimally dispatched, but will likewise cause
              the zAAP engines to be minimally dispatched as
              well. Also, because the zAAP engines are
              dispatched using the z/OS dispatcher, which
              must execute on a CP, poor processor throughput
              will cause Java work to not be dispatched on
              the zAAP engines, even though sufficient zAAP
              resources are available.

              Additionally, the weight percentages are based
              on the total weight of the ICF pool and
              therefore might require a change in the weights
              for LPs that use ICF engines.

zIIP Usage    The ratio of Samples Using zIIP to the sum of
Delay Ratio   Samples Using zIIP and Samples zIIP Delay. This
              is a relative measure of how much the defined
              workloads are waiting for zIIP  processor
              dispatch. Because the zIIP technology is
              relatively new, no firm guidelines have yet
              been established for determining when a
              performance impact might occur.