# PERF_COUNTER_COUNTER

Applies To: Windows Server 2003, Windows Server 2003 R2, Windows Server 2003 with SP1, Windows Server 2003 with SP2

Description |
This counter type shows the average number of operations completed during each second of the sample interval. Counters of this type measure time in ticks of the system clock. The F variable represents the number of ticks per second. The value of F is factored into the equation so that the result can be displayed in seconds. |

Generic type |
Difference. |

Formula |
(N1- N0) / ( (D1-D0) / F), where the numerator (N) represents the number of operations performed during the last sample interval, the denominator (D) represents the number of ticks elapsed during the last sample interval, and F is the frequency of the ticks. |

Average |
(Nx - N0) / ((Dx - D0) / F) |

Example |
System\File Read Operations/sec |