cc-metric-collector/collectors/likwid/groups/power9/BRANCH.txt
2021-03-25 14:47:10 +01:00

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SHORT Branch prediction miss rate/ratio
EVENTSET
PMC1 PM_BR_PRED
PMC2 PM_IOPS_CMPL
PMC3 PM_BR_MPRED_CMPL
PMC4 PM_RUN_INST_CMPL
PMC5 PM_RUN_CYC
METRICS
Runtime (RDTSC) [s] time
CPI PMC5/PMC4
Branch rate (PMC1)/PMC4
Branch misprediction rate PMC3/PMC4
Branch misprediction ratio PMC3/(PMC1)
Instructions per branch PMC4/(PMC1)
Operations per branch PMC2/PMC1
LONG
Formulas:
Branch rate = PM_BR_PRED/PM_RUN_INST_CMPL
Branch misprediction rate = PM_BR_MPRED_CMPL/PM_RUN_INST_CMPL
Branch misprediction ratio = PM_BR_MPRED_CMPL/PM_BR_PRED
Instructions per branch = PM_RUN_INST_CMPL/PM_BR_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.