# PERF_COUNTER_TIMER_INV

 Description This is an inverse counter type. Inverse counters measure the time that a component is not active and derive the active time from that measurement. Counters of this type display the average percentage of active time observed during sample interval. The value of these counters is calculated by monitoring the percentage of time that the service was inactive and then subtracting that value from 100 percent. This counter type is the same as PERF_100NSEC_TIMER_INV except that it measures time in units of ticks of the system performance timer rather than in 100ns units. Generic type Percentage Formula (1- ((N1 - N0) / (D1 - D0))) x 100, where the denominator (D) represents the total elapsed time of the sample interval and the numerator (N) represents the time during the interval when the monitored components were inactive. Average (1- ((Nx - N0) / (Dx - D0))) x 100 Example There are no counters of this type installed with Windows 2000.

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