public static void ConcurrentSearchTest(ConcurrentRBTree <long, Data> rbTree, int numOfThreads,
long searchOperationsPerThread, long nodesMaxKeyValue)
{
Console.WriteLine("************* Search Test ***************");
Console.WriteLine();
Console.WriteLine($"Total threads: {numOfThreads}");
Console.WriteLine($"We will perform {searchOperationsPerThread} search operations on each thread");
Console.WriteLine();
var threads = new Thread[numOfThreads];
for (var i = 0; i < numOfThreads; i++)
{
threads[i] = new Thread(() =>
{
var rand = new Random();
for (var j = 0; j < searchOperationsPerThread; j++)
{
var target = 1 + (long)(rand.NextDouble() * nodesMaxKeyValue);
_ = rbTree.GetData(target);
}
});
}
// search test
var watch = new Stopwatch();
watch.Start();
foreach (var thread in threads)
{
thread.Start();
}
foreach (var thread in threads)
{
thread.Join();
}
watch.Stop();
Console.WriteLine($"Total time spent in search: {watch.ElapsedMilliseconds} ms");
Console.WriteLine();
Console.WriteLine();
}
public static void ConcurrentDeleteTest(ConcurrentRBTree <long, Data> rbTree, int numOfThreads,
int nodesPerThread, int totalNodesToDelete, long nodesMaxKeyValue)
{
if (rbTree.isValidRBT(nodesMaxKeyValue + 1) == false)
{
Console.WriteLine($"After insertion, RBT is invalid");
Debug.Assert(!rbTree.isValidRBT(nodesMaxKeyValue + 1));
}
//rbTree.printLevelOrder();
Console.WriteLine("************* Delete Test ***************");
Console.WriteLine();
Console.WriteLine($"We will perform {totalNodesToDelete} delete operations");
Console.WriteLine();
// generate valid deletable items
var count = 0;
var deleteItems = new HashSet <long>();
var rand = new Random();
while (true)
{
long target;
while (true)
{
target = 1 + (long)(rand.NextDouble() * nodesMaxKeyValue);
if (!deleteItems.Contains(target))
{
break;
}
}
var data = rbTree.GetData(target);
if (data != null)
{
deleteItems.Add(data.Item1);
count++;
}
if (count == totalNodesToDelete)
{
break;
}
}
var keysToDelete = deleteItems.ToArray();
var threads = new Thread[numOfThreads];
for (var i = 0; i < threads.Length; i++)
{
var iLocal = i;
threads[i] = new Thread(() =>
{
var start = iLocal * nodesPerThread;
var end = start + nodesPerThread - 1;
for (var j = start; j <= end; j++)
{
rbTree.Remove(keysToDelete[j]);
}
});
threads[i].Name = i.ToString();
}
Console.WriteLine($"Total nodes to delete: {totalNodesToDelete}");
Console.WriteLine($"Total threads: {numOfThreads}");
Console.WriteLine($"Total nodes per thread: {nodesPerThread}");
Console.WriteLine();
// starting deletes
var watch = new Stopwatch();
watch.Start();
foreach (var thread in threads)
{
thread.Start();
}
foreach (var thread in threads)
{
thread.Join();
}
watch.Stop();
if (rbTree.isValidRBT(nodesMaxKeyValue + 1) == false)
{
Console.WriteLine($"After delete, RBT is invalid");
}
Console.WriteLine($"Total time spent in deletion: {watch.ElapsedMilliseconds} ms");
Console.WriteLine();
Console.WriteLine($"Node count after deletion: {(rbTree.Count())}");
Console.WriteLine();
Console.WriteLine($"Tree depth: {rbTree.MaxDepth()}");
Console.WriteLine();
Console.WriteLine();
}
public static void ConcurrentInsertDeleteTest(ConcurrentRBTree <long, Data> rbTree, long totalNodesInTree, int numOfThreads,
int nodesPerThread, long totalNodesToDelete, long totalNodesToInsert, long nodesMaxKeyValue)
{
Console.WriteLine("************* Create Tree ***************");
Console.WriteLine();
ConcurrentInsertTest(rbTree, 12, totalNodesInTree / 12, totalNodesInTree, nodesMaxKeyValue, false);
Console.WriteLine($"Node count of tree: {(rbTree.Count())}");
Console.WriteLine();
Console.WriteLine($"Tree depth: {rbTree.MaxDepth()}");
Console.WriteLine();
Console.WriteLine();
// generate valid deletable items
var deleteCount = 0;
var deleteItems = new HashSet <long>();
var rand = new Random();
while (true)
{
long target;
while (true)
{
target = 1 + (long)(rand.NextDouble() * nodesMaxKeyValue);
if (!deleteItems.Contains(target))
{
break;
}
}
var data = rbTree.GetData(target);
if (data != null)
{
deleteItems.Add(data.Item1);
deleteCount++;
}
if (deleteCount == totalNodesToDelete)
{
break;
}
}
var keysToDelete = deleteItems.ToArray();
var deleteThreads = new Thread[numOfThreads];
for (var i = 0; i < deleteThreads.Length; i++)
{
var iLocal = i;
deleteThreads[i] = new Thread(() =>
{
var start = iLocal * nodesPerThread;
var end = start + nodesPerThread - 1;
for (var j = start; j <= end; j++)
{
rbTree.Remove(keysToDelete[j]);
}
});
deleteThreads[i].Name = i.ToString();
}
// generate valid insertable items
var insertCount = 0;
var insertItems = new HashSet <long>();
while (true)
{
long target;
while (true)
{
target = 1 + (long)(rand.NextDouble() * nodesMaxKeyValue);
if (!insertItems.Contains(target))
{
break;
}
}
var data = rbTree.GetData(target);
if (data == null)
{
insertItems.Add(target);
insertCount++;
}
if (insertCount == totalNodesToInsert)
{
break;
}
}
var values = insertItems.Select(i => new Tuple <long, Data>(i, new Data {
Value = i.ToString()
})).ToArray();
var insertThreads = new Thread[numOfThreads];
for (var i = 0; i < insertThreads.Length; i++)
{
var iLocal = i;
insertThreads[i] = new Thread(() =>
{
var start = iLocal * nodesPerThread;
var end = start + nodesPerThread - 1;
for (var j = start; j <= end; j++)
{
rbTree.Add(values[j].Item1, values[j].Item2);
}
});
insertThreads[i].Name = i.ToString();
}
Console.WriteLine("************* Insert-Delete Test ***************");
Console.WriteLine();
Console.WriteLine($"Total nodes to insert: {totalNodesToInsert}");
Console.WriteLine($"Total nodes to delete: {totalNodesToDelete}");
Console.WriteLine($"Total threads: {numOfThreads}");
Console.WriteLine($"Total nodes per thread: {nodesPerThread}");
Console.WriteLine();
// starting inserts
var watch = new Stopwatch();
watch.Start();
for (var i = 0; i < numOfThreads; i++)
{
insertThreads[i].Start();
deleteThreads[i].Start();
}
for (var i = 0; i < numOfThreads; i++)
{
insertThreads[i].Join();
deleteThreads[i].Join();
}
watch.Stop();
Console.WriteLine($"Total time spent in simultaneous insertion & deletion: {watch.ElapsedMilliseconds} ms");
Console.WriteLine();
Console.WriteLine($"Node count after insertion: {(rbTree.Count())}");
Console.WriteLine();
Console.WriteLine($"Tree depth: {rbTree.MaxDepth()}");
Console.WriteLine();
Console.WriteLine();
}