You are developing a method named CreateCounters that will create performance counters for an
application. The method includes the following code. (Line numbers are included for reference only.)
You need to ensure that Counter1 is available for use in Windows Performance Monitor (PerfMon).
Which code segment should you insert at line 16?
A.
CounterType = PcrformanccCounterType.RawBase
B.
CounterType = PerformanceCounterType.AverageBase
C.
CounterType = PerformanceCounterType.SampleBase
D.
CounterType = PerformanceCounterType.CounterMultiBase
Would say C because a counter of type “SampleFraction” needs a base counter in the following code
Answer: C
Explanation:
PerformanceCounterType.AverageTimer32 – An average counter that measures the time it takes, on average, to complete a process or operation. Counters of this type display a ratio of the total elapsed time of the sample interval to the number of processes or operations completed during that time. This counter type measures time in ticks of the system clock.
Formula: ((N 1 -N 0)/F)/(B 1 -B 0), where N 1 and N 0 are performance counter readings, B 1 and B 0 are their corresponding AverageBase values, and F is the number of ticks per second.
The value of F is factored into the equation so that the result can be displayed in seconds.
Thus, the numerator represents the numbers of ticks counted during the last sample interval, F represents the frequency of the ticks, and the denominator represents the number of operations completed during the last sample interval. Counters of this type include PhysicalDisk Avg.
Disk sec/Transfer.
PerformanceCounterType.AverageBase – A base counter that is used in the calculation of time or count averages, such as AverageTimer32 and AverageCount64. Stores the denominator for calculating a counter to present “time per operation” or “count per operation”..
http://msdn.microsoft.com/en-us/library/system.diagnostics.performancecountertype.aspx