using System.Collections.Concurrent;
using System.IO;
using System.Threading.Tasks;

namespace MediaOpt
{
    internal class Program
    {
        private static readonly ConcurrentQueue<string> Queue = new ConcurrentQueue<string>();

        private static void Main(string[] args)
        {
            for (var i = 0; i < 25; i++)
            {
                ProcessDir(@"D:\Music");
            }

            for (var i = 0; i < 25; i++)
            {
                ProcessDirM(@"D:\Music");
            }
        }

        private static void ProcessDir(string path)
        {
            var files = Directory.EnumerateFiles(path);
            foreach (var file in files)
            {
                Queue.Enqueue(file);
            }
            var dirs = Directory.EnumerateDirectories(path);
            foreach (var dir in dirs)
            {
                ProcessDir(dir);
            }
        }

        private static void ProcessDirM(string path)
        {
            var files = Directory.EnumerateFiles(path);
            Parallel.ForEach(files, s => { Queue.Enqueue(s); });
            var dirs = Directory.EnumerateDirectories(path);
            Parallel.ForEach(dirs, ProcessDirM);
        }
    }
}