我正在尝试使用 PLINQ 来加速一个简单的模拟,但我正在设法减慢它的速度(未注释的 AsParallel 运行速度较慢):
class Program
{
private static readonly Random Random = new Random();
private static IEnumerable<Tuple<double, double>> GetNextPair(int pairs)
{
for (int i = 0; i < pairs; i++)
yield return new Tuple<double, double>(Random.NextDouble(), Random.NextDouble());
}
private static double RunSimPlinq(int count)
{
return
GetNextPair(count)
//.ToArray()
//.AsParallel()
.Count(tuple =>
{
//Thread.Sleep(10);
return tuple.Item1*tuple.Item1 + tuple.Item2*tuple.Item2 <= 1d;
})*4d/count;
}
static void Main()
{
Stopwatch sw = new Stopwatch();
sw.Start();
Console.WriteLine(RunSimPlinq(100));
sw.Stop();
Console.WriteLine(sw.ElapsedMilliseconds);
Console.Read();
}
}
我对原因的唯一猜测是对可枚举的兰特的争论(或者相反,复制它)。
PS。输出应该是 PI 的估计值。