private void WarmUpIterations(long delay, TicksTiming timing)
{
for (int i = 0; i < AdjustmentIterations; i++)
{
timing.WaitTicks(delay);
}
}
private long MinimumDelay()
{
TicksStopWatch watch = new TicksStopWatch();
TicksTiming timing = new TicksTiming();
watch.Start();
for (int i = 0; i < AdjustmentIterations; i++)
{
timing.WaitTicks(0);
}
watch.Stop();
return(watch.Elapsed() / AdjustmentIterations);
}
private void AdjustDelay(Delays delays, int index)
{
TicksStopWatch watch = new TicksStopWatch();
TicksTiming timing = new TicksTiming();
long difference;
long differencePerIteration;
long average = 0;
long oldAverage = 0;
long delay = delays.values[index];
long adjustedDelay = delay;
int adjustmentRuns = 1;
long targetRuntime = AdjustmentIterations * delay;
long minimumDelay = MinimumDelay();
WarmUpIterations(delay, timing);
do
{
watch.Start();
for (int i = 0; i < AdjustmentIterations; i++)
{
timing.WaitTicks(adjustedDelay);
}
watch.Stop();
difference = targetRuntime - watch.Elapsed();
differencePerIteration = difference / AdjustmentIterations;
if (-differencePerIteration > adjustedDelay)
{
adjustedDelay /= 2;
}
else
{
adjustedDelay += differencePerIteration;
oldAverage = average;
if (adjustmentRuns == 1)
{
average = adjustedDelay;
}
else
{
average = ((average * (adjustmentRuns - 1)) / adjustmentRuns) + (adjustedDelay /
adjustmentRuns);
}
adjustmentRuns++;
}
if (adjustedDelay <= 0)
{
break;
}
if ((Math.Abs(average - oldAverage) < (0.01 * delay)) && adjustmentRuns > 10)
{
break;
}
}while (true);
if (average < minimumDelay)
{
Sharpen.Runtime.Err.WriteLine(">> Smallest achievable delay: " + minimumDelay);
Sharpen.Runtime.Err.WriteLine(">> Required delay setting: " + average);
Sharpen.Runtime.Err.WriteLine(">> Using delay(0) to wait as short as possible.");
Sharpen.Runtime.Err.WriteLine(">> Results will not be accurate.");
average = 0;
}
delays.values[index] = average;
}
/// <exception cref="Db4objects.Db4o.Ext.Db4oIOException"></exception>
public DelayingBin(IBin bin, Delays delays) : base(bin)
{
_delays = delays;
_timing = new TicksTiming();
}
public DelayingIoAdapter(IoAdapter delegateAdapter, Delays delays) : base(delegateAdapter
)
{
_delays = delays;
_timing = new TicksTiming();
}
