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20 lines
503 B
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20 lines
503 B
Plaintext
40COL
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%c%RAPL Measurement Accuracy
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* Intel Documentation indicates Energy
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readings are updated roughly every
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millisecond (1kHz)
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* The hardware also reports measurement
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quanta. This can vary among processor
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releases. On our Sandybridge EP all
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Energy measurements are in multiples
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of 15.2nJ
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* Power and Energy can vary between
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identical packages on a system,
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even when running identical workloads.
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It is unclear whether this is due to
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process variation or else calibration
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