public bool Equals(CounterSample other)
{
return
(rawValue == other.rawValue &&
baseValue == other.counterFrequency &&
counterFrequency == other.counterFrequency &&
systemFrequency == other.systemFrequency &&
timeStamp == other.timeStamp &&
timeStamp100nSec == other.timeStamp100nSec &&
counterTimeStamp == other.counterTimeStamp &&
counterType == other.counterType);
}
// may throw InvalidOperationException, Win32Exception
public CounterSample NextSample()
{
CounterSample sample;
if (changed)
{
UpdateInfo();
}
GetSample(impl, false, out sample);
valid_old = true;
old_sample = sample;
return(sample);
}
public static float ComputeCounterValue(CounterSample newSample)
{
switch (newSample.CounterType)
{
case PerformanceCounterType.RawFraction:
case PerformanceCounterType.NumberOfItems32:
case PerformanceCounterType.NumberOfItemsHEX32:
case PerformanceCounterType.NumberOfItems64:
case PerformanceCounterType.NumberOfItemsHEX64:
return((float)newSample.RawValue);
default:
return(0);
}
}
// may throw InvalidOperationException, Win32Exception
public float NextValue()
{
CounterSample sample;
if (changed)
{
UpdateInfo();
}
GetSample(impl, false, out sample);
float val;
if (valid_old)
{
val = CounterSampleCalculator.ComputeCounterValue(old_sample, sample);
}
else
{
val = CounterSampleCalculator.ComputeCounterValue(sample);
}
valid_old = true;
old_sample = sample;
return(val);
}
public static float ComputeCounterValue(CounterSample oldSample,
CounterSample newSample)
{
if (newSample.CounterType != oldSample.CounterType)
{
throw new Exception("The counter samples must be of the same type");
}
switch (newSample.CounterType)
{
case PerformanceCounterType.RawFraction:
case PerformanceCounterType.NumberOfItems32:
case PerformanceCounterType.NumberOfItemsHEX32:
case PerformanceCounterType.NumberOfItems64:
case PerformanceCounterType.NumberOfItemsHEX64:
return((float)newSample.RawValue);
case PerformanceCounterType.AverageCount64:
return((float)(newSample.RawValue - oldSample.RawValue) / (float)(newSample.BaseValue - oldSample.BaseValue));
case PerformanceCounterType.AverageTimer32:
return((((float)(newSample.RawValue - oldSample.RawValue)) / newSample.SystemFrequency) / (float)(newSample.BaseValue - oldSample.BaseValue));
case PerformanceCounterType.CounterDelta32:
case PerformanceCounterType.CounterDelta64:
return((float)(newSample.RawValue - oldSample.RawValue));
case PerformanceCounterType.CounterMultiTimer:
return(((float)(newSample.RawValue - oldSample.RawValue)) / (float)(newSample.TimeStamp - oldSample.TimeStamp) * 100.0f / newSample.BaseValue);
case PerformanceCounterType.CounterMultiTimer100Ns:
return(((float)(newSample.RawValue - oldSample.RawValue)) / (float)(newSample.TimeStamp100nSec - oldSample.TimeStamp100nSec) * 100.0f / newSample.BaseValue);
case PerformanceCounterType.CounterMultiTimerInverse:
return((newSample.BaseValue - ((float)(newSample.RawValue - oldSample.RawValue)) / (float)(newSample.TimeStamp - oldSample.TimeStamp)) * 100.0f);
case PerformanceCounterType.CounterMultiTimer100NsInverse:
return((newSample.BaseValue - ((float)(newSample.RawValue - oldSample.RawValue)) / (float)(newSample.TimeStamp100nSec - oldSample.TimeStamp100nSec)) * 100.0f);
case PerformanceCounterType.CounterTimer:
case PerformanceCounterType.CountPerTimeInterval32:
case PerformanceCounterType.CountPerTimeInterval64:
return(((float)(newSample.RawValue - oldSample.RawValue)) / (float)(newSample.TimeStamp - oldSample.TimeStamp));
case PerformanceCounterType.CounterTimerInverse:
return((1.0f - ((float)(newSample.RawValue - oldSample.RawValue)) / (float)(newSample.TimeStamp100nSec - oldSample.TimeStamp100nSec)) * 100.0f);
case PerformanceCounterType.ElapsedTime:
// FIXME
return(0);
case PerformanceCounterType.Timer100Ns:
return(((float)(newSample.RawValue - oldSample.RawValue)) / (float)(newSample.TimeStamp - oldSample.TimeStamp) * 100.0f);
case PerformanceCounterType.Timer100NsInverse:
return((1f - ((float)(newSample.RawValue - oldSample.RawValue)) / (float)(newSample.TimeStamp - oldSample.TimeStamp)) * 100.0f);
case PerformanceCounterType.RateOfCountsPerSecond32:
case PerformanceCounterType.RateOfCountsPerSecond64:
return(((float)(newSample.RawValue - oldSample.RawValue)) / (float)(newSample.TimeStamp - oldSample.TimeStamp) * 10000000);
default:
Console.WriteLine("Counter type {0} not handled", newSample.CounterType);
return(0);
}
}
static extern bool GetSample(IntPtr impl, bool only_value, out CounterSample sample);
public static float Calculate(CounterSample counterSample,
CounterSample nextCounterSample)
{
return(CounterSampleCalculator.ComputeCounterValue(counterSample, nextCounterSample));
}