C# multithreading Strange behaviour

Question

Basically I'm working on this beat detection algorithm, the strange thing i am encountering right now is that when i split the work load on to another thread. So now i have one main thread and another worker thread. My worker thread somehow is always working faster than the main thread. It seems strange because what i have learned is that the main thread should theoretically always be faster because it is not taking time to initialise the thread. However what i get is even i pass a extra 1024 samples to the worker thread( they are both working with around 30 million samples currently) it is still faster than the main thread. Is it because i have applications running on my main thread? I'm really confused right now. here is the code

UnityEngine.Debug.Log ("T800 Start");
        Step3 s1= new Step3();
        Step3WOMT s2= new Step3WOMT();
        System.Object tempObj= samples2 as System.Object;
        float[] tempArray = new float[eS.Length/ 2];
        System.Threading.ParameterizedThreadStart parameterizedts = new System.Threading.ParameterizedThreadStart(s1.DoStep3);
        System.Threading.Thread T1 = new System.Threading.Thread(parameterizedts);
        T1.Start (tempObj);
        s2.DoStep3(samples1);
        UnityEngine.Debug.Log ("s2");
        //UnityEngine.Debug.Log (stopwatch.ElapsedMilliseconds);
        T1.Join();

Don't worry I'm only using c# features in the multithread so I believe it should be fine. What i am really confused about is that if i comment out the T1.join(); line the whole thing somehow go even slower. Im genuinely confused right now as there seems no reasonable answer to this question.

Answer 1

T1.join() does all the magic. It allow main thread to wait till all the worker threads are complete. Is that necessary ? depends on ur application. it is expected for a main thread to wait for the end of execution of its worker threads.