SHORT  Cycles per instruction

EVENTSET
PMC0  RETIRED_INSTRUCTIONS
PMC1  CPU_CLOCKS_UNHALTED
PMC2  RETIRED_UOPS

METRICS
Runtime (RDTSC) [s] time
Runtime unhalted [s]  PMC1*inverseClock
CPI   PMC1/PMC0
CPI (based on uops)   PMC1/PMC2
IPC   PMC0/PMC1

LONG
Formulas:
CPI = CPU_CLOCKS_UNHALTED/RETIRED_INSTRUCTIONS
CPI (based on uops) = CPU_CLOCKS_UNHALTED/RETIRED_UOPS
IPC = RETIRED_INSTRUCTIONS/CPU_CLOCKS_UNHALTED
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This group measures how efficient the processor works with
regard to instruction throughput. Also important as a standalone
metric is RETIRED_INSTRUCTIONS as it tells you how many instruction
you need to execute for a task. An optimization might show very
low CPI values but execute many more instruction for it.