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31 lines
998 B
Plaintext
31 lines
998 B
Plaintext
SHORT Branch prediction miss rate/ratio
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EVENTSET
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PMC0 PM_BR_PRED_BR_CMPL
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PMC1 PM_BR_PRED_CCACHE_CMPL
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PMC2 PM_BR_PRED_CR_CMPL
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PMC3 PM_BR_MPRED_CMPL
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PMC4 PM_RUN_INST_CMPL
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PMC5 PM_RUN_CYC
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METRICS
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Runtime (RDTSC) [s] time
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CPI PMC5/PMC4
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Branch rate (PMC0+PMC1+PMC2)/PMC4
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Branch misprediction rate PMC3/PMC4
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Branch misprediction ratio PMC4/(PMC0+PMC1+PMC2)
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Instructions per branch PMC4/(PMC0+PMC1+PMC2)
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LONG
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Formulas:
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Branch rate = BR_INST_RETIRED_ALL_BRANCHES/INSTR_RETIRED_ANY
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Branch misprediction rate = BR_MISP_RETIRED_ALL_BRANCHES/INSTR_RETIRED_ANY
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Branch misprediction ratio = BR_MISP_RETIRED_ALL_BRANCHES/BR_INST_RETIRED_ALL_BRANCHES
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Instructions per branch = INSTR_RETIRED_ANY/BR_INST_RETIRED_ALL_BRANCHES
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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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