public static void TestChurnStability()
{
var allocator = new Allocator(2048);
var random = new Random(5);
ulong idCounter = 0;
var allocatedIds = new QuickList<ulong>(BufferPools<ulong>.Locking);
var unallocatedIds = new QuickList<ulong>(BufferPools<ulong>.Locking);
for (int i = 0; i < 512; ++i)
{
long start;
var id = idCounter++;
//allocator.ValidatePointers();
if (allocator.Allocate(id, 1 + random.Next(5), out start))
{
allocatedIds.Add(id);
}
else
{
unallocatedIds.Add(id);
}
//allocator.ValidatePointers();
}
for (int timestepIndex = 0; timestepIndex < 100000; ++timestepIndex)
{
//First add and remove a bunch randomly.
for (int i = random.Next(Math.Min(allocatedIds.Count, 15)); i >= 0; --i)
{
var indexToRemove = random.Next(allocatedIds.Count);
//allocator.ValidatePointers();
Assert.IsTrue(allocator.Deallocate(allocatedIds.Elements[indexToRemove]));
//allocator.ValidatePointers();
unallocatedIds.Add(allocatedIds.Elements[indexToRemove]);
allocatedIds.FastRemoveAt(indexToRemove);
}
for (int i = random.Next(Math.Min(unallocatedIds.Count, 15)); i >= 0; --i)
{
var indexToAllocate = random.Next(unallocatedIds.Count);
long start;
//allocator.ValidatePointers();
if (allocator.Allocate(unallocatedIds.Elements[indexToAllocate], random.Next(3), out start))
{
//allocator.ValidatePointers();
allocatedIds.Add(unallocatedIds.Elements[indexToAllocate]);
unallocatedIds.FastRemoveAt(indexToAllocate);
}
//allocator.ValidatePointers();
}
//Check to ensure that everything's still coherent.
for (int i = 0; i < allocatedIds.Count; ++i)
{
Assert.IsTrue(allocator.Contains(allocatedIds.Elements[i]));
}
for (int i = 0; i < unallocatedIds.Count; ++i)
{
Assert.IsFalse(allocator.Contains(unallocatedIds.Elements[i]));
}
}
//Wind it down.
for (int i = 0; i < allocatedIds.Count; ++i)
{
Assert.IsTrue(allocator.Deallocate(allocatedIds.Elements[i]));
}
//Confirm cleanup.
for (int i = 0; i < allocatedIds.Count; ++i)
{
Assert.IsFalse(allocator.Contains(allocatedIds.Elements[i]));
}
for (int i = 0; i < unallocatedIds.Count; ++i)
{
Assert.IsFalse(allocator.Contains(unallocatedIds.Elements[i]));
}
}
