cc-metric-collector/collectors/likwid/groups/zen2/BRANCH.txt

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2021-03-25 14:47:10 +01:00
SHORT Branch prediction miss rate/ratio
EVENTSET
FIXC1 ACTUAL_CPU_CLOCK
FIXC2 MAX_CPU_CLOCK
PMC0 RETIRED_INSTRUCTIONS
PMC1 CPU_CLOCKS_UNHALTED
PMC2 RETIRED_BRANCH_INSTR
PMC3 RETIRED_MISP_BRANCH_INSTR
METRICS
Runtime (RDTSC) [s] time
Runtime unhalted [s] FIXC1*inverseClock
Clock [MHz] 1.E-06*(FIXC1/FIXC2)/inverseClock
CPI PMC1/PMC0
Branch rate PMC2/PMC0
Branch misprediction rate PMC3/PMC0
Branch misprediction ratio PMC3/PMC2
Instructions per branch PMC0/PMC2
LONG
Formulas:
Branch rate = RETIRED_BRANCH_INSTR/RETIRED_INSTRUCTIONS
Branch misprediction rate = RETIRED_MISP_BRANCH_INSTR/RETIRED_INSTRUCTIONS
Branch misprediction ratio = RETIRED_MISP_BRANCH_INSTR/RETIRED_BRANCH_INSTR
Instructions per branch = RETIRED_INSTRUCTIONS/RETIRED_BRANCH_INSTR
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The rates state how often on average a branch or a mispredicted branch occurred
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.