private static void MultiThreadPerformanceTest(IFixedSizeCache<string, int> cache, int loopCount)
{
ConcurrentBag<long> allTickTimes = new ConcurrentBag<long>();
ConcurrentBag<long> allElapsedTimesMilliseconds = new ConcurrentBag<long>();
Parallel.For(0, 25, i =>
{
Task.Run(() => TimeParralelCacheWrite(cache, loopCount));
Stopwatch timer = TimeParralelCacheWrite(cache, loopCount);
allTickTimes.Add(timer.ElapsedTicks);
allElapsedTimesMilliseconds.Add(timer.ElapsedMilliseconds);
});
double averageTickTime = allTickTimes.Average();
double averageTimeMilliseconds = allElapsedTimesMilliseconds.Average();
Console.WriteLine("Average ticks: " + averageTickTime);
Console.WriteLine("Average ms: " + averageTimeMilliseconds);
//Assert.That(averageTickTime, Is.LessThanOrEqualTo(3005055));
//Assert.That(averageTimeMilliseconds, Is.LessThanOrEqualTo(1826)); //spinlock > normal lock > MemoryCache > flashcaches
Assert.That(cache.CacheItemCount, Is.LessThanOrEqualTo(300000));
}
private static Stopwatch TimeParralelCacheWrite(IFixedSizeCache<string,int> cache, int loopCount)
{
var hammertime = true;
Task hammerOnCacheTask = Task.Run(() =>
{
// ReSharper disable AccessToModifiedClosure
while (hammertime)
{
for (var i = 0; i < loopCount; i++)
{
if (hammertime == false)
{
break;
}
if (i % 2 == 0)
{
int i1 = i;
cache.GetOrAdd(i1.ToString(), s => i1);
}
else
{
int i1 = i;
cache.GetOrAdd((i1 - 5).ToString(), s => (i1 - 5));
}
}
}
});
// ReSharper restore AccessToModifiedClosure
Stopwatch timer = new Stopwatch();
timer.Start();
Parallel.For(0, loopCount, i => { cache.GetOrAdd(i.ToString(), s => i); });
timer.Stop();
hammertime = false;
hammerOnCacheTask.Wait(10);
return timer;
}
private static void WriteToCacheLoop(ref bool mustLoop, IFixedSizeCache<string, Item> cache, Average average)
{
Stopwatch timer = new Stopwatch();
long counter = 0;
int startAtCount = cache.MaxItemCount /2;
while (mustLoop)
{
//byte[] charBuffer = new byte[40];
//_random.NextBytes(charBuffer);
//string key = Encoding.Unicode.GetString(charBuffer).ToLowerInvariant();
string key = (Guid.NewGuid().ToString()).PadLeft(Random.Next(40), (char)Random.Next(256));
//Console.WriteLine(key);
timer.Restart();
// ReSharper disable once PossibleNullReferenceException
cache.GetOrAdd(key, k => EmptyItem);
timer.Stop();
if (counter > startAtCount)
{
double averageCallTimeInNs = timer.Elapsed.Ticks*100;
average.Add(averageCallTimeInNs);
}
counter++;
}
}
