private static void Main()
{
var tests = new FlashCacheWithBucketsTests();
try
{
//Run a lot of times to see if rare race condition takes place
//No exceptions should occurr and the tests should succeed.
var numberOfRuns = 128;
Console.WriteLine("\nMultiThreadedTest Run for 60 seconds.");
Task testTask = Task.Run(() => tests.MultiThreadedTest(60 * 1000));
Console.WriteLine("\nMultiThreadedOverwriteBucketTest number of runs: " + numberOfRuns);
for (int i = 0; i < numberOfRuns; i++)
{
tests.MultiThreadedOverwriteBucketTest();
Console.Write("\r Count: " + i);
}
Console.WriteLine("\nMultiThreadedReadWriteTest number of runs: " + numberOfRuns);
for (int i = 0; i < numberOfRuns; i++)
{
tests.MultiThreadedReadWriteTest();
Console.Write("\r Count: " + i);
}
testTask.Wait();
GC.Collect();
//Run a task where the performance should not degrade significantly over time
IFixedSizeCache<string,Item> cache = new FlashCacheWithBuckets<string, Item>(512,new StringComparerOrdinalIgnoreCaseFNV1AHash());
long startMemory = GC.GetTotalMemory(true);
GC.KeepAlive(cache);
Console.WriteLine("\nCache testing with MaxItemCount: "+cache.MaxItemCount);
//prefill the cache for half
for (int i = 0; i < cache.MaxItemCount / 2; i++)
{
cache.GetOrAdd(i.ToString(), s => new Item());
}
bool mustRun = true;
int numberOfWriteThreads = 8;
double minAverage = 0;
double maxAverage = 0;
double averageDelta = 0;
int sampleCount = 0;
Task[] tasks = new Task[numberOfWriteThreads];
Average average = new Average();
for (int i = 0; i < 8; i++)
{
tasks[i] = Task.Run(() => WriteToCacheLoop(ref mustRun, cache, average));
}
int sampleIntervalInMillis = 250;
double previousAverage = 1000;
Task sampleAverageTask = Task.Run(() =>
{
Thread.Sleep(sampleIntervalInMillis);
while (mustRun)
{
Thread.Sleep(sampleIntervalInMillis);
double currentAverageLocal = average.CurrentAverage;
if (currentAverageLocal > maxAverage)
{
maxAverage = currentAverageLocal;
}
if (currentAverageLocal < minAverage)
{
minAverage = currentAverageLocal;
}
double difference = previousAverage - currentAverageLocal;
averageDelta = Average.StreamAverage(averageDelta, difference, sampleCount);
previousAverage = currentAverageLocal;
sampleCount++;
string cacheItemCount = cache.CacheItemCount.ToString("0000");
Console.Write("\r Avg: " + currentAverageLocal.ToString("F") + " ns." + " Avg delta: " + averageDelta.ToString("F") + " CacheItemCount: "+cacheItemCount+" SampleCount: "+sampleCount);
//trim the cache to increase lock contention
cache.Trim(TrimOptions.Aggressive);
}
});
Console.ReadKey();
mustRun = false;
sampleAverageTask.Wait();
Task.WaitAll(tasks);
cache.Trim(TrimOptions.Aggressive);
long after = GC.GetTotalMemory(true);
double diff = after - startMemory;
Console.WriteLine("\nDone Cache testing with MaxItemCount: " + cache.MaxItemCount + " items in cache: " + cache.CacheItemCount + " estimated size of cache memory is: "+ (diff / 1024) / 1024+" Mb");
}
catch (Exception e)
{
Console.WriteLine("Failed with: "+e.Message);
throw;
}
}
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++;
}
}
