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22 lines
759 B
Plaintext
22 lines
759 B
Plaintext
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SHORT Pairing ratio
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EVENTSET
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PMC0 INSTRUCTIONS_EXECUTED
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PMC1 INSTRUCTIONS_EXECUTED_V_PIPE
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METRICS
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Runtime (RDTSC) [s] time
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V-pipe ratio PMC1/PMC0
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Pairing ratio PMC1/(PMC0-PMC1)
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LONG
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Formulas:
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V-pipe ratio = INSTRUCTIONS_EXECUTED_V_PIPE/INSTRUCTIONS_EXECUTED
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Pairing ratio = INSTRUCTIONS_EXECUTED_V_PIPE/(INSTRUCTIONS_EXECUTED-INSTRUCTIONS_EXECUTED_V_PIPE)
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-
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Each hardware thread on the Xeon Phi can execute two instruction simultaneously,
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one in the U-pipe and one in the V-pipe. But this is only possible if the
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instructions can be paired. The instructions executed in paired fashion are counted
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by the event INSTRUCTIONS_EXECUTED_V_PIPE. The event INSTRUCTIONS_EXECUTED increments
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for each instruction, hence the maximal increase per cycle can be 2.
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