Question

I need to calculate the time taken to execute each thread.
So I used this code to do it.

Stopwatch stopWatch = new Stopwatch();
stopWatch.Start();

stopWatch.Stop();
TimeSpan ts = stopWatch.Elapsed;

string elapsedTime = String.Format("{0:00}:{1:00}:{2:00}.{3:00}", ts.Hours, ts.Minutes, ts.Seconds,ts.Milliseconds);
Console.WriteLine(elapsedTime, "RunTime");

Now my each thread execute a method work(), this is how it goes:

void work(){
    Stopwatch stopWatch = new Stopwatch();
    stopWatch.Start();

    //codes,,,

    stopWatch.Stop();

    TimeSpan ts = stopWatch.Elapsed;
    string elapsedTime = String.Format("{0:00}:{1:00}:{2:00}.{3:00}", ts.Hours, ts.Minutes, ts.Seconds,ts.Milliseconds);
    Console.WriteLine(elapsedTime, "RunTime");
}

So now my question is do I need to create an array of 1000 stopwatch objects or not because say 1000 work() methods are running concurrently.

Answer 1

Your code will work fine as it is, assuming each call is done on a different thread, as you are creating a new StopWatch object per thread.

That is, each StopWatch is not a shared resource, so the different threads should not be interfering with other thread StopWatch objects.