CA MICS Hardware and SCP Analyzer (RMF) Queries › Hardware Instrumentation Services CPU Measurement Facility › RMFWCT - CPU MF Workload Characterization CPUTYPE Level › Overview

Overview

The RMFWCT query produces charts that reveal how efficiently workloads executing on the different types of IPUs (Individual Processor Units) assigned to z/OS LPARs make use of the cache and memory hierarchy of IBM z10 and later generation Central Processing Complexes (CPCs). z/OS LPARs can be assigned three different IPU types:

CP

Central Processors – General processing unit

zAAP

System z Application Assist Processor – specialty engine for JAVA workloads

zIIP

System z Integrated Information Processor – specialty engine for enclave exploiting workloads

Note: zIIP specialty engines accept and process both zIIP and zAAP eligible workloads on a CPC if the CPC has no zAAP engines installed and the IEASYSxx PARMLIB member has ZAAPZIIP=YES specified.

The three data extract CSV’s generated by the RMFWCT query are:

• V1 z10 CPU MF CPUTYPE RNI and Cache
• V2 z114 z196 CPU MF CPUTYPE RNI and Cache
• V3 zEC12 CPU MF CPUTYPE RNI and Cache

Each data extract generates the following seven chart views:

1. CPUTYPE Level – RNI Workload Hint and L1 Cache Miss Pct
2. CPUTYPE Level – L1 Cache Miss Sourcing Percentages
3. CPUTYPE Level – L1 Data Cache Miss Sourcing Percentages
4. CPUTYPE Level – L1 Instruction Cache Miss Sourcing Percentages
5. CPUTYPE Level – Penalty Cycles and Avg Penalty per L1 Miss
6. CPUTYPE Level – Realized MIPS and Avg IPU Count
7. CPUTYPE Level – Instruction Count and CPI

Refer to the RMFWCL – CPU MF Workload Characterization LPAR Level query description for information about each of these chart views. The only difference between the charts created by the RMFWCL LPAR level query and this RMFWCT CPUTYPE level query is one of granularity. Where the RMFWCL query views generate a single chart for each z/OS LPAR, the RMFWCT CPUTYPE level query views generate a separate chart for each IPU type (e.g., CP, zAAP, or zIIP) assigned to each LPAR.

The two chart samples above show charts generated for view 1 – RNI Workload Hint and L1 Cache Miss Pct, for a single LPAR, ‘SY9S.’ LPAR ‘SY9S’ is a z/OS LPAR running on an IBM 2817-712 (z196 CPC with 12 CP engines). LPAR ‘SY9S’ was defined with eight logical CP engines and three logical zIIP engines. The workload hint, Level 1 cache miss percent, and Relative Nest Intensity (RNI) for the eight logical CP engines are displayed in the first chart above. The second chart above shows the same metrics for the three zIIP engines. To see the number of logical engines of each type assigned to the LPAR, you can examine the 6th chart view – Realized MIPS and Avg IPU Count.

It is apparent from viewing these two charts that the Level 1 cache miss percentage (cyan colored line), and the RNI (red line) are quite different for workloads when executing on the CP engines versus the zIIP engines.