Cycles Per InstructionCycles Per InstructionThis ratio represents the cycles per instruction retired (CPI). The theoretical lower bound for CPI is 0.167 since the processor can retire a maximum of 6 instructions in each clock. In practice, an application rarely gets close to the theoretical CPI. The CPI is heavily dependant on the work being done, how well the code is optimized and how efficient the processor is being given work. For some applications, a good CPI is considered to be around 0.3, for others it might be 1.5.
>Counter dependencies:
This insight is dependent on the following performance counter function:
CPI = CPU_CYCLES/IA64_INST_RETIRED-THIS
low value: 0.01
high value: 0.1
This insight is relevant when CPI is high.
Advice
_itanium(r)_2_processor.gif){kind=small}