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  1. PO
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    <p>Edit: </p> <p>Ooops, I was also first confused. </p> <p>The problem is that it only looks aditive (accumulative) because the ElapsedTime values are always output in increasing order only. </p> <p>So, if I have, as in my demo below, in the order of launching: </p> <ul> <li>1st launched task's duration of 10 sec (10000 msec), </li> <li>the 2nd task's duration of 8 sec (8 000 ms), </li> <li>the 3d task's duration of 6 sec (6 000 ms), </li> </ul> <p>then the results appear in <strong>output</strong> out of initial order - ALWAYS in order of increasing duration of tasks: </p> <ul> <li>the 1st in output: the 3d launched task's duration (of 6 sec duration) </li> <li>the 2nd in output: the 2nd launched task's duration (of 8 sec duration) </li> <li>the 3d (last) in output: the 1st launched task's duration (of 10 sec duration) </li> </ul> <p>Here is the output from Console app below: </p> <pre><code>from DoSomething 6043 from main 6043 from DoSomething 8057 from main 8057 from DoSomething 10058 from main 10058 </code></pre> <p>And it is obvious why - because the faster task always finishes and output before longer (more time consuming) task. </p> <pre><code>using System; using System.Collections.Generic; using System.Threading; using System.Threading.Tasks; using System.Diagnostics; namespace ConsoleApplication1 { class Program { static void Main(string[] args) { var iResult = new List&lt;Task&gt;(); for (int i=5; i&gt;2; i--) { int load = i; var task = Task.Factory.StartNew(() =&gt; DoSomething(load), TaskCreationOptions.LongRunning); //following commented lines do NOT change the behavior in question task.ContinueWith(m =&gt; Console.WriteLine("from main "+m.Result)); //iResult.Add(task); } Console.ReadLine(); } //public static myMsg DoSomething() public static long DoSomething(int load) { Stopwatch timer = System.Diagnostics.Stopwatch.StartNew(); //usage of either prev or following 2 lines produce the same results //Stopwatch timer = new Stopwatch(); //instead of prev .StartNew(); //timer.Start();// instead of prev .StartNew(); Console.WriteLine("***Before calling DoLongRunningTask() " + timer.ElapsedMilliseconds); Console.WriteLine("GetHashCode "+timer.GetHashCode()); DoLongRunningTask(load); timer.Stop(); long elapsed = timer.ElapsedMilliseconds; Console.WriteLine("from DoSomething "+ elapsed); return elapsed;//return new myMsg(timer.ElaspedMilliseconds); } public static void DoLongRunningTask(int load) { Thread.Sleep(2000*load); /******************* another variant of calculation intensive loading load = load; double result = 0; for (int i = 1; i &lt; load*100000; i++) result += Math.Exp(Math.Log(i) ); */ } } } </code></pre>
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    1. POStopwatch in a Task seems to be additive across all tasks, want to measure just task interval
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    1. USGennady Vanin Геннадий Ванин
    1. USGennady Vanin Геннадий Ванин
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    1. POStopwatch in a Task seems to be additive across all tasks, want to measure just task interval
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    1. COWhy would the load change between tasks? They are supposed to last the same amount of time.
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      1. USLightStriker
 

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