MSDN Library

PERF_SAMPLE_COUNTER

Description This counter type shows the average number of operations completed in one second. It measures time in units of ticks of the system performance timer. The F variable represents the number of ticks that occur in one second. It is factored into the equation so that the result can be displayed in seconds.
Generic type Average
Formula (N1 - N0) / ((D1 - D0) / F), where the numerator (N) represents the number of operations completed, the denominator (D) represents elapsed time in units of ticks of the system performance timer, and F represents the number of ticks that elapse in one second.
Average (Nx - N0) / ((Dx - D0) / F)
Example There are no counters of this type installed with Windows 2000.

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