public void PriorityTest()
{
using (var group = new ThreadGroup(2, createBackgroundThreads: true, name: "PriorityTest")
{
DefaultConcurrencyPadding = 0
}) {
var queue = group.GetQueueForType <HighPriorityBlockingWorkItem>();
var barrier1 = new HighPriorityBlockingWorkItem {
Signal = new AutoResetEvent(false)
};
queue.Enqueue(barrier1);
var barrier2 = new HighPriorityBlockingWorkItem {
Signal = new AutoResetEvent(false)
};
queue.Enqueue(barrier2);
var barrier3 = new HighPriorityBlockingWorkItem {
Signal = new AutoResetEvent(false)
};
queue.Enqueue(barrier3);
group.NotifyQueuesChanged();
// HACK: Give the thread group time to start processing high priority items
while (queue.ItemsInFlight < group.ThreadCount)
{
Thread.Sleep(1);
}
var voidQueue = group.GetQueueForType <VoidWorkItem>();
var testItem = new VoidWorkItem();
for (int i = 0; i < 10; i++)
{
voidQueue.Enqueue(testItem);
}
group.NotifyQueuesChanged();
var ok = voidQueue.WaitUntilDrained(50);
Assert.IsFalse(ok, "wait for low priority queue to drain while threads are blocked on high priority");
barrier1.Signal.Set();
Assert.IsFalse(voidQueue.WaitUntilDrained(50), "ensure new high priority item is claimed by thread that finished previous one");
barrier2.Signal.Set();
barrier3.Signal.Set();
ok = voidQueue.WaitUntilDrained(500);
Assert.IsTrue(ok, "once high priority items are done the low priority ones should run");
}
}
public void ManuallyStep()
{
using (var group = new ThreadGroup(0, 0)) {
var queue = group.GetQueueForType <TestWorkItem>();
var item = new TestWorkItem();
Assert.IsFalse(item.Ran);
queue.Enqueue(item);
bool exhausted;
queue.Step(out exhausted, 1);
Assert.IsTrue(exhausted);
Assert.IsTrue(item.Ran);
}
}
public void AutoSpawnMoreThreads()
{
using (var group = new ThreadGroup(0, 2)) {
var queue = group.GetQueueForType <SleepyWorkItem>();
queue.Enqueue(new SleepyWorkItem());
group.NotifyQueuesChanged();
Assert.GreaterOrEqual(1, group.Count);
queue.Enqueue(new SleepyWorkItem());
group.NotifyQueuesChanged();
Assert.GreaterOrEqual(2, group.Count);
queue.WaitUntilDrained();
}
}
public void MultipleThreadPerformanceTest()
{
const int count = 800;
var timeProvider = Time.DefaultTimeProvider;
using (var group = new ThreadGroup(4, createBackgroundThreads: true, name: "MultipleThreadPerformanceTest")
{
DefaultConcurrencyPadding = 0
}) {
var queue = group.GetQueueForType <SlightlySlowWorkItem>();
var item = new SlightlySlowWorkItem();
var beforeEnqueue = timeProvider.Ticks;
for (int i = 0; i < count; i++)
{
queue.Enqueue(ref item, notifyChanged: false);
// Notify the group periodically that we've added new work items.
// This ensures it spins up a reasonable number of threads.
if ((i % 500) == 0)
{
group.NotifyQueuesChanged();
}
}
var afterEnqueue = timeProvider.Ticks;
var beforeWait = timeProvider.Ticks;
queue.WaitUntilDrained(10000);
var afterWait = timeProvider.Ticks;
var perItem = (afterWait - beforeWait) / (double)count / Time.MillisecondInTicks;
Console.WriteLine(
"Enqueue took {0:0000.00}ms, Wait took {1:0000.00}ms. Est speed {3:0.000000}ms/item Final thread count: {2}",
TimeSpan.FromTicks(afterEnqueue - beforeEnqueue).TotalMilliseconds,
TimeSpan.FromTicks(afterWait - beforeWait).TotalMilliseconds,
group.Count, perItem
);
}
}
public void ManuallyStep()
{
using (var group = new ThreadGroup(0, createBackgroundThreads: true, name: "ManuallyStep")
{
DefaultConcurrencyPadding = 0
}) {
var queue = group.GetQueueForType <TestWorkItem>();
var item = new TestWorkItem();
Assert.IsFalse(item.Ran);
queue.Enqueue(item);
bool exhausted;
queue.Step(out exhausted, 1);
Assert.IsTrue(exhausted);
Assert.IsTrue(item.Ran);
}
}
public void AutoSpawnThread()
{
using (var group = new ThreadGroup(0, 1)) {
var queue = group.GetQueueForType <TestWorkItem>();
var item = new TestWorkItem();
Assert.IsFalse(item.Ran);
queue.Enqueue(item);
Assert.AreEqual(0, group.Count);
Assert.IsFalse(item.Ran);
group.NotifyQueuesChanged();
Assert.AreEqual(1, group.Count);
queue.WaitUntilDrained();
Assert.IsTrue(item.Ran);
}
}
public void MultipleThreadPerformanceTest()
{
const int count = 500000;
var timeProvider = Time.DefaultTimeProvider;
using (var group = new ThreadGroup(1)) {
var queue = group.GetQueueForType <VoidWorkItem>();
queue.DefaultStepCount = 1024;
var item = new VoidWorkItem();
var beforeEnqueue = timeProvider.Ticks;
for (int i = 0; i < count; i++)
{
queue.Enqueue(ref item);
// Notify the group periodically that we've added new work items.
// This ensures it spins up a reasonable number of threads.
if ((i % 20000) == 0)
{
group.NotifyQueuesChanged();
}
}
var afterEnqueue = timeProvider.Ticks;
var beforeWait = timeProvider.Ticks;
queue.WaitUntilDrained();
var afterWait = timeProvider.Ticks;
Console.WriteLine(
"Enqueue took {0:0000.00}ms, Wait took {1:0000.00}ms. Final thread count: {2}",
TimeSpan.FromTicks(afterEnqueue - beforeEnqueue).TotalMilliseconds,
TimeSpan.FromTicks(afterWait - beforeWait).TotalMilliseconds,
group.Count
);
}
}
public void MainThreadPerformanceTest()
{
const int count = 200;
var timeProvider = Time.DefaultTimeProvider;
using (var group = new ThreadGroup(1, createBackgroundThreads: true, name: "MainThreadPerformanceTest")
{
DefaultConcurrencyPadding = 0
}) {
var queue = group.GetQueueForType <SlightlySlowWorkItem>(forMainThread: true);
var item = new SlightlySlowWorkItem();
var beforeEnqueue = timeProvider.Ticks;
for (int i = 0; i < count; i++)
{
queue.Enqueue(ref item, notifyChanged: false);
}
var afterEnqueue = timeProvider.Ticks;
var beforeWait = timeProvider.Ticks;
while (!queue.IsEmpty)
{
group.StepMainThread();
}
var afterWait = timeProvider.Ticks;
var perItem = (afterWait - beforeWait) / (double)count / Time.MillisecondInTicks;
Console.WriteLine(
"Enqueue took {0:0000.00}ms, Wait took {1:0000.00}ms. Est speed {3:0.000000}ms/item Final thread count: {2}",
TimeSpan.FromTicks(afterEnqueue - beforeEnqueue).TotalMilliseconds,
TimeSpan.FromTicks(afterWait - beforeWait).TotalMilliseconds,
group.Count, perItem
);
}
}
