linqpad-perfcounter-observable-example.cs

void Main()
{
	IObservable<PerformanceSample> performanceCounterObservable = PerfCounterObservable.FromRealTime(TimeSpan.FromSeconds(1), new[]{
			@"\Processor(_Total)\% Processor Time",
			@"\Memory(_Total)\% Committed Bytes In Use",
			@"\Memory(_Total)\Available MBytes"})
		.Take(6);
	performanceCounterObservable.Subscribe(new PerfSampleObserver());
}

class PerfSampleObserver : IObserver<PerformanceSample>
{
	public void OnNext(PerformanceSample sample)
	{
		sample.Dump();
	}
	public void OnError(Exception error)
	{
	}
	public void OnCompleted()
	{
	}
}