private static void TestSpeed(IWeightedRandomizer <int> randomizer, bool displayText)
{
GCLatencyMode oldLatencyMode = GCSettings.LatencyMode;
try
{
//Prevent garbage collection during tests
GCSettings.LatencyMode = GCLatencyMode.LowLatency;
const int numIterations = 10000;
Stopwatch timer = new Stopwatch();
if (displayText)
{
Console.WriteLine("Testing {0}", randomizer.GetType().Name);
Console.WriteLine("--------------------------------");
}
//NextWithReplacement()/1000
randomizer.Clear();
timer.Reset();
timer.Start();
for (int i = 1; i <= numIterations; i++)
{
randomizer.Add(i, i);
}
for (int i = 1; i <= numIterations / 1000; i++)
{
randomizer.NextWithReplacement();
}
timer.Stop();
GC.Collect();
if (displayText)
{
Console.WriteLine("Add()x{0} + NextWithReplacement()x{1}: {2} ms", numIterations, numIterations / 1000,
timer.ElapsedMilliseconds);
}
//NextWithReplacement()
randomizer.Clear();
timer.Reset();
timer.Start();
for (int i = 1; i <= numIterations; i++)
{
randomizer.Add(i, i);
}
for (int i = 1; i <= numIterations; i++)
{
randomizer.NextWithReplacement();
}
timer.Stop();
GC.Collect();
if (displayText)
{
Console.WriteLine("Add()x{0} + NextWithReplacement()x{1}: {2} ms", numIterations, numIterations,
timer.ElapsedMilliseconds);
}
//NextWithReplacement() * 10
randomizer.Clear();
timer.Reset();
timer.Start();
for (int i = 1; i <= numIterations; i++)
{
randomizer.Add(i, i);
}
for (int i = 1; i <= 10 * numIterations; i++)
{
randomizer.NextWithReplacement();
}
timer.Stop();
GC.Collect();
if (displayText)
{
Console.WriteLine("Add()x{0} + NextWithReplacement()x{1}: {2} ms", numIterations, 10 * numIterations,
timer.ElapsedMilliseconds);
}
//NextWithReplacement() (interleaved)
randomizer.Clear();
timer.Reset();
timer.Start();
for (int i = 1; i <= numIterations; i++)
{
randomizer.Add(i, i);
randomizer.NextWithReplacement();
}
timer.Stop();
GC.Collect();
if (displayText)
{
Console.WriteLine("( Add() + NextWithReplacement() )x{0} (interleaved): {1} ms", numIterations,
timer.ElapsedMilliseconds);
}
//NextWithRemoval()
randomizer.Clear();
timer.Reset();
timer.Start();
for (int i = 1; i <= numIterations; i++)
{
randomizer.Add(i, i);
}
for (int i = 1; i <= numIterations; i++)
{
randomizer.NextWithRemoval();
}
timer.Stop();
GC.Collect();
if (displayText)
{
Console.WriteLine("Add()x{0} + NextWithRemoval()x{1}: {2} ms", numIterations, numIterations,
timer.ElapsedMilliseconds);
Console.WriteLine();
Console.WriteLine();
}
} //end try
finally
{
// ALWAYS set the latency mode back
GCSettings.LatencyMode = oldLatencyMode;
}
}