MSDN Library

PERF_AVERAGE_BULK

Description This counter type shows how many items are processed, on average, during an operation. Counters of this type display a ratio of the items processed (such as bytes sent) to the number of operations completed. The ratio is calculated by comparing the number of items processed during the last interval to the number of operations completed during the last interval.
Generic type Average
Formula (N1 - N0) / (D1 - D0), where the numerator (N) represents the number of items processed during the last sample interval and the denominator (D) represents the number of operations completed during the last two sample intervals.
Average (Nx - N0) / (Dx - D0)
Example PhysicalDisk\ Avg. Disk Bytes/Transfer

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