cc-metric-collector/collectors/likwid/groups/arm8_n1/BRANCH.txt

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2021-03-25 14:47:10 +01:00
SHORT Branch prediction miss rate/ratio
EVENTSET
PMC0 INST_RETIRED
PMC1 CPU_CYCLES
PMC2 BR_PRED
PMC3 BR_MIS_PRED
PMC4 INST_SPEC
METRICS
Runtime (RDTSC) [s] time
CPI PMC1/PMC0
Branch rate PMC2/PMC0
Branch misprediction rate PMC3/PMC0
Branch misprediction ratio PMC3/(PMC2+PMC3)
Instructions per branch PMC0/(PMC2+PMC3)
LONG
Formulas:
CPI = CPU_CYCLES/INST_RETIRED
Branch rate = BR_PRED/INST_RETIRED
Branch misprediction rate = BR_MIS_PRED/INST_RETIRED
Branch misprediction ratio = BR_MIS_PRED/(BR_PRED+BR_MIS_PRED)
Instructions per branch = INSTR_RETIRED_ANY/(BR_PRED+BR_MIS_PRED)
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The rates state how often in average a branch or a mispredicted branch occured
per instruction retired in total. The Branch misprediction ratio sets directly
into relation what ratio of all branch instruction where mispredicted.
Instructions per branch is 1/Branch rate.