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This report shows Cycles per Instruction or actual MIPS per processor, Level 1 Miss Percentage and Relative Nest Intensity calculated from data from the SMF 113 records.

 

The values are shown with CPU Service by Service Class or Report Class information, so you can see how the values change with different workloads.

 

Report Information

 

•Cycles Per Instruction (CPI) The number cycles divided by the number of instructions executed. An indication of how fast the CPU is running the work. It is influenced by factors such as instruction stream complexity and cache and memory access (RNI).

•MIPS Millions of instructions per second. The rate at which instructions were being executed when the CPU was processing. This is effectively the inverse of the CPI, so they show the same information. The MIPS value increases when the work is being processed faster, so the MIPS display may be more intuitive than CPI.
This MIPS measurement only has a loose relationship with the MIPS rating of the processor. A wide variety of workloads is used to come up with a MIPS rating. The typical variation in this MIPS measurement is an illustration of how much it is influenced by workload and why care needs to be taken when comparing MIPS ratings.

•Level 1 Miss per 100 Instructions (L1MP) The number of times data or instructions were not found in level 1 cache. Fetches from lower cache levels are slower, so in general as the L1MP rises, the work runs more slowly.

•Relative Nest Intensity (RNI) An indication of the relative usage of the memory hierarchy, using formulas published by IBM for the specific processor type.

•LSPR Workload The LSPR workload hint over time. Derived from the L1MP and RNI using the table published by IBM. Can be Low, Average or High.

 

CPU Measurement Facility

 

Service by Service Class

 

Report Parameters

 

 

SMF records used for this report