for (int i = 0; i < nrT; i++)
            {
                var t = new Thread(new ParameterizedThreadStart(doWork));
                var par = new Params { Start = i, Procs = nrT, Size = N };
                while (!t.IsAlive)
                    t.Start(par);
                threads.Add(t);
            }
            foreach (var t in threads)
                t.Join();