static void Main(string[] args)
        {
            int num = 8;
            Task[] tasks = new Task[num];
            for (int i = 0; i < num; i++)
            {               
                tasks[i] = Task.Run(() => {
                    while (true)
                    {
                        Console.WriteLine("aaa");
                    }
                });
            }
            Task.WaitAll(tasks);
        }