public void Should_be_fast_and_friendly()
{
NewId.Next();
int limit = 1000000;
var ids = new NewId[limit];
Parallel.For(0, limit, x => ids[x] = NewId.Next());
Stopwatch timer = Stopwatch.StartNew();
Parallel.For(0, limit, x => ids[x] = NewId.Next());
timer.Stop();
Console.WriteLine("Generated {0} ids in {1}ms ({2}/ms)", limit, timer.ElapsedMilliseconds,
limit / timer.ElapsedMilliseconds);
Console.WriteLine("Distinct: {0}", ids.Distinct().Count());
var duplicates = ids.GroupBy(x => x).Where(x => x.Count() > 1).ToArray();
Console.WriteLine("Duplicates: {0}", duplicates.Count());
foreach (var newId in duplicates)
{
Console.WriteLine("{0} {1}", newId.Key, newId.Count());
}
}
public void Should_be_completely_thread_safe_to_avoid_duplicates()
{
NewId.Next();
Stopwatch timer = Stopwatch.StartNew();
int threadCount = 20;
var loopCount = 1024 * 1024;
int limit = loopCount * threadCount;
var ids = new NewId[limit];
ParallelEnumerable
.Range(0, limit)
.WithDegreeOfParallelism(8)
.WithExecutionMode(ParallelExecutionMode.ForceParallelism)
.ForAll(x => { ids[x] = NewId.Next(); });
timer.Stop();
Console.WriteLine("Generated {0} ids in {1}ms ({2}/ms)", limit, timer.ElapsedMilliseconds,
limit / timer.ElapsedMilliseconds);
Console.WriteLine("Distinct: {0}", ids.Distinct().Count());
var duplicates = ids.GroupBy(x => x).Where(x => x.Count() > 1).ToArray();
Console.WriteLine("Duplicates: {0}", duplicates.Count());
foreach (var newId in duplicates)
{
Console.WriteLine("{0} {1}", newId.Key, newId.Count());
}
}
public void Should_be_completely_thread_safe_to_avoid_duplicates()
{
NewId.Next();
Stopwatch timer = Stopwatch.StartNew();
int threadCount = 20;
int workerThreads, complete;
ThreadPool.GetMinThreads(out workerThreads, out complete);
ThreadPool.SetMinThreads(workerThreads + threadCount, complete);
var loopCount = 1024 * 1024;
int limit = loopCount * threadCount;
var ids = new NewId[limit];
var tasks = new List <Task>();
var begin = new TaskCompletionSource <bool>();
for (int threadId = 0; threadId < threadCount; threadId++)
{
var start = threadId * loopCount;
var end = start + loopCount;
var task = Task.Factory.StartNew(() =>
{
//begin.Task.Wait();
for (int i = start; i < end; i++)
{
ids[i] = NewId.Next();
}
});
tasks.Add(task);
}
//begin.SetResult(true);
Task.WaitAll(tasks.ToArray());
timer.Stop();
Console.WriteLine("Generated {0} ids in {1}ms ({2}/ms)", limit, timer.ElapsedMilliseconds,
limit / timer.ElapsedMilliseconds);
Console.WriteLine("Distinct: {0}", ids.Distinct().Count());
var duplicates = ids.GroupBy(x => x).Where(x => x.Count() > 1).ToArray();
Console.WriteLine("Duplicates: {0}", duplicates.Count());
foreach (var newId in duplicates)
{
Console.WriteLine("{0} {1}", newId.Key, newId.Count());
}
}
public void Should_be_completely_thread_safe_to_avoid_duplicates()
{
NewId.Next();
Stopwatch timer = Stopwatch.StartNew();
int threadCount = 20;
int workerThreads, complete;
ThreadPool.GetMinThreads(out workerThreads, out complete);
ThreadPool.SetMinThreads(workerThreads + threadCount, complete);
var loopCount = 1024 * 1024;
int limit = loopCount * threadCount;
var ids = new NewId[limit];
var tasks = new List<Task>();
var begin = new TaskCompletionSource<bool>();
for (int threadId = 0; threadId < threadCount; threadId++)
{
var start = threadId * loopCount;
var end = start + loopCount;
var task = Task.Factory.StartNew(() =>
{
//begin.Task.Wait();
for (int i = start; i < end; i++)
ids[i] = NewId.Next();
});
tasks.Add(task);
}
//begin.SetResult(true);
Task.WaitAll(tasks.ToArray());
timer.Stop();
Console.WriteLine("Generated {0} ids in {1}ms ({2}/ms)", limit, timer.ElapsedMilliseconds,
limit / timer.ElapsedMilliseconds);
Console.WriteLine("Distinct: {0}", ids.Distinct().Count());
var duplicates = ids.GroupBy(x => x).Where(x => x.Count() > 1).ToArray();
Console.WriteLine("Duplicates: {0}", duplicates.Count());
foreach (var newId in duplicates)
{
Console.WriteLine("{0} {1}", newId.Key, newId.Count());
}
}
