.NET Core到底有多強?

測試代碼:
C# Release 未優化

class Program
    {
        static long counter = 0;
        static void Main(string[] args)
        {
            for (int m = 0; m < 100; m++)
            {
                Stopwatch s = new Stopwatch();
                s.Start();
                for (long i = 0; i < 200000000; i++)
                {
                    counter = counter * 2 + 3;
                }
                s.Stop();
                Console.WriteLine(s.Elapsed.TotalMilliseconds + " ms");
            }
            Console.ReadLine();
        }
    }

Core 2.2

Framework 4.6.1

C# Release 優化

class Program
    {
        static long counter = 0;
        static void Main(string[] args)
        {
            for (int m = 0; m < 100; m++)
            {
                Stopwatch s = new Stopwatch();
                s.Start();
                long temp = counter;
                for (long i = 0; i < 200000000; i++)
                {
                    temp = temp * 2 + 3;
                    counter = temp;
                }
                s.Stop();
                Console.WriteLine(s.Elapsed.TotalMilliseconds + " ms");
            }
        }
    }

Core 2.2

Framework 4.6.1

go 未優化(照抄C#)

var counter int64 = 0
func ExampleLinq_3() {
	for m := 0; m < 100; m++ {
		t1 := time.Now()
		for i := 0; i < 200000000; i++ {
			counter = counter*2 + 3
		}
		fmt.Println("用時:", time.Now().Sub(t1))
	}
	// Output:
}

go 優化(照抄C#)

var counter int64 = 0
func ExampleLinq_4() {
	for m := 0; m < 100; m++ {
		t1 := time.Now()
		temp := counter
		for i := 0; i < 200000000; i++ {
			temp = temp*2 + 3
			counter = temp
		}
		fmt.Println("用時:", time.Now().Sub(t1))
	}
	// Output:
}

java 8 未優化（照抄C#）

java 8 優化（照抄C#）

由於go沒有靜態變量

.net core 非靜態

java 8