CPU subcomponent reports
The CPU reports provide key capacity planning metrics on processor activity, collected on SMF timestamp, hourly, daily, and weekly level. Data is aggregated by capacity planning shift as well as CEC level, LPAR level, Workload level, Service or Report Class level, and Business Application level.
- CPU usage
- CPU forecasting
- LSPR workload
- Software cost analysis
Understanding MIPS calculations in the CPU subcomponent reports
A control table is used by the CPU subcomponent for MIPS calculations. This is the LSPR_MIPS control table and must be initialized before use with parameters specific to your installation. Refer to Step 1.4: Configuring control tables for more information.
- MIPS Capacity
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The CEC MIPS capacity is calculated using the MIPS rating from the LSPR_MIPS control table. The LSPR_MIPS control table contains MIPS ratings for the following LSPR Workload categories: LOW, AVG, and HIGH. The LSPR category used for MIPS calculations is based on the most popular LSPR Workload during the reporting period. For example, if most of the SMF intervals in the reporting period reported an LSPR Workload of HIGH, then the MIPS rating for the LSPR HIGH Workload will used when calculating MIPS capacity on the report.
The LPAR MIPS capacity is calculated as a percentage of the CEC MIPS capacity, and this percentage is calculated using the number of physical processors in the LPAR as well as the weight distribution of the logical processors in the LPAR.
- MIPS Usage
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MIPS usage is calculated on various levels, for example, CEC, LPAR, Workload, Service/Report Class or Business Application. MIPS usage is calculated as a percentage of the MIPS Capacity. This is the calculation used to calculate MIPS:
CPU Seconds Used / Available Seconds * MIPS Capacity
The Available Seconds is calculated as:
Interval * Number of Physical Processors
The MIPS Capacity is calculated using the MIPS rating from the LSPR_MIPS control table.
The LSPR_MIPS control table contains MIPS ratings for the following LSPR Workload categories: LOW, AVG and HIGH. The LSPR category used for MIPS calculations is based on the most popular LSPR Workload during the reporting period. For example, if most of the SMF intervals in the reporting period reported an LSPR Workload of HIGH, then the MIPS rating for the LSPR HIGH Workload will used when calculating MIPS usage on the report.