public static void TestParallelRandomAdd2()
{
var swSerial = new Stopwatch();
long Ticks = 0;
var d = new ImmutableSortedDictionary <int, int>();
var n = 104729; //Prime
Debug.Assert(!d.ContainsKey(0));
swSerial.Start();
ParallelEnumerable.Range(0, n).ForAll
(
k =>
{
var v = (k * 7 + 11) % n;
var sw = new Stopwatch();
sw.Start();
var od = d;
while (true)
{
var nd = Interlocked.CompareExchange(ref d, od.Add(v, v * 2), od);
if (nd == od)
{
break;
}
od = nd;
}
sw.Stop();
Interlocked.Add(ref Ticks, sw.ElapsedTicks);
}
);
swSerial.Stop();
ParallelEnumerable.Range(0, n).ForAll
(
k =>
{
Debug.Assert(d.ContainsKey(k));
Debug.Assert(d.TryGetValue(k) == k * 2);
}
);
Debug.Assert(d.TryGetMin().Value == 0);
Debug.Assert(d.TryGetMax().Value == (n - 1) * 2);
Debug.Assert(!d.ContainsKey(-1));
Debug.Assert(d.Count == n);
var l = d.ToList();
Debug.Assert(l.Count == n);
for (int k = 0; k < n; k += 1)
{
var p = l[k];
Debug.Assert(p.Key == k);
Debug.Assert(p.Value == k * 2);
}
swSerial.Start();
ParallelEnumerable.Range(0, n).ForAll
(
k =>
{
var sw = new Stopwatch();
sw.Start();
var od = d;
while (true)
{
var nd = Interlocked.CompareExchange(ref d, od.SetItem(k, k * 3), od);
if (nd == od)
{
break;
}
od = nd;
}
sw.Stop();
Interlocked.Add(ref Ticks, sw.ElapsedTicks);
}
);
swSerial.Stop();
ParallelEnumerable.Range(0, n).ForAll
(
k =>
{
Debug.Assert(d.ContainsKey(k));
Debug.Assert(d.TryGetValue(k) == k * 3);
}
);
ParallelEnumerable.Range(0, n).ForAll
(
k =>
{
var p = d.TryGetPairByIndex(k);
Debug.Assert(p.Value.Key == k);
Debug.Assert(p.Value.Value == k * 3);
}
);
swSerial.Start();
ParallelEnumerable.Range(0, n).ForAll
(
k =>
{
var sw = new Stopwatch();
sw.Start();
var od = d;
while (true)
{
var nd = Interlocked.CompareExchange(ref d, od.Remove(k), od);
if (nd == od)
{
break;
}
od = nd;
}
sw.Stop();
Interlocked.Add(ref Ticks, sw.ElapsedTicks);
}
);
swSerial.Stop();
Debug.Assert(d.Count == 0);
var l2 = d.ToList();
Debug.Assert(l2.Count == 0);
var ParallelMilliseconds = (double)(Ticks) / (double)(Stopwatch.Frequency) * 1000;
var SerialMilliseconds = (double)(swSerial.ElapsedTicks) / (double)(Stopwatch.Frequency) * 1000;
Console.WriteLine("TestParallelRandomAdd2");
Console.WriteLine("并行耗时: " + ParallelMilliseconds.ToString() + "ms");
Console.WriteLine("线性耗时: " + SerialMilliseconds.ToString() + "ms");
Console.WriteLine("加速比: " + (ParallelMilliseconds / SerialMilliseconds).ToString());
}
public static void TestRandomAdd()
{
var d = new ImmutableSortedDictionary <int, int>();
var n = 1009; //Prime
Debug.Assert(!d.ContainsKey(0));
for (int k = 0; k < n; k += 1)
{
var v = (k * 7 + 11) % n;
d = d.Add(v, v * 2);
}
for (int k = 0; k < n; k += 1)
{
Debug.Assert(d.ContainsKey(k));
Debug.Assert(d.TryGetValue(k) == k * 2);
}
for (int k = 0; k < n; k += 1)
{
var p = d.TryGetPairByIndex(k);
Debug.Assert(p.Value.Key == k);
Debug.Assert(p.Value.Value == k * 2);
}
Debug.Assert(d.TryGetMin().Value == 0);
Debug.Assert(d.TryGetMax().Value == (n - 1) * 2);
Debug.Assert(!d.ContainsKey(-1));
Debug.Assert(d.Count == n);
{
var k = 0;
foreach (var p in d.Range(Optional <int> .Empty, Optional <int> .Empty))
{
Debug.Assert(p.Key == k);
Debug.Assert(p.Value == k * 2);
k += 1;
}
}
{
var k = n - 1;
foreach (var p in d.RangeReversed(Optional <int> .Empty, Optional <int> .Empty))
{
Debug.Assert(p.Key == k);
Debug.Assert(p.Value == k * 2);
k -= 1;
}
}
{
var k = 0;
foreach (var p in d.RangeByIndex(Optional <int> .Empty, Optional <int> .Empty))
{
Debug.Assert(p.Key == k);
Debug.Assert(p.Value == k * 2);
k += 1;
}
}
{
var k = n - 1;
foreach (var p in d.RangeByIndexReversed(Optional <int> .Empty, Optional <int> .Empty))
{
Debug.Assert(p.Key == k);
Debug.Assert(p.Value == k * 2);
k -= 1;
}
}
{
var k = 100;
foreach (var p in d.Range(100, 200))
{
Debug.Assert(p.Key == k);
Debug.Assert(p.Value == k * 2);
k += 1;
}
}
{
var k = 200;
foreach (var p in d.RangeReversed(100, 200))
{
Debug.Assert(p.Key == k);
Debug.Assert(p.Value == k * 2);
k -= 1;
}
}
{
var k = 100;
foreach (var p in d.RangeByIndex(100, 200))
{
Debug.Assert(p.Key == k);
Debug.Assert(p.Value == k * 2);
k += 1;
}
}
{
var k = 200;
foreach (var p in d.RangeByIndexReversed(100, 200))
{
Debug.Assert(p.Key == k);
Debug.Assert(p.Value == k * 2);
k -= 1;
}
}
Debug.Assert(d.RangeCount(100, 200) == 101);
Debug.Assert(d.RangeCount(0, n - 1) == n);
Debug.Assert(d.RangeCount(0, Optional <int> .Empty) == n);
Debug.Assert(d.RangeCount(Optional <int> .Empty, n - 1) == n);
Debug.Assert(d.RangeCount(Optional <int> .Empty, Optional <int> .Empty) == n);
var l = d.ToList();
Debug.Assert(l.Count == n);
for (int k = 0; k < n; k += 1)
{
var p = l[k];
Debug.Assert(p.Key == k);
Debug.Assert(p.Value == k * 2);
}
for (int k = 0; k < n; k += 1)
{
d = d.SetItem(k, k * 3);
}
for (int k = 0; k < n; k += 1)
{
Debug.Assert(d.ContainsKey(k));
Debug.Assert(d.TryGetValue(k) == k * 3);
}
for (int k = 0; k < n; k += 1)
{
var v = (k * 11 + 7) % n;
d = d.Remove(v);
}
Debug.Assert(d.Count == 0);
var l2 = d.ToList();
Debug.Assert(l2.Count == 0);
}