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