This is a bug. It doesn’t seem to have a lot of attention around it, through, so I’d suggesting following up with that report. The uninspiring workaround appears to be to ignore negative values: long elapsedMilliseconds = Math.Max(0, stopwatch.ElapsedMilliseconds);
From MSDN: Any instance members are not guaranteed to be thread safe.
To avoid future problems with a timer, here is the right code: timer = new Timer(); timer.Tick += new EventHandler(timer_Tick); timer.Interval = 1; //set interval on 1 milliseconds timer.Enabled = true; //start the timer Result result = new Result(); result = new GeneticAlgorithms().TabuSearch(parametersTabu, functia); timer.Enabled = false; //stop the timer private void timer_Tick(object sender, EventArgs … Read more
Your thread is sharing CPU Time with other threads. The Sleep will end as soon as it is your turn again and the kernel notices the sleep time has elapsed, so it is not that accurate. CPU load, process priorities, number of concurrent threads, even from other processes, will have effect upon it.
I’ve just written an article that explains how a test setup must be done to get an high accuracy (better than 0.1ms) out of the stopwatch. I Think it should explain everything. http://www.codeproject.com/KB/testing/stopwatch-measure-precise.aspx
You’ll find one in http://commons.apache.org/lang/ It’s called org.apache.commons.lang.time.StopWatch But it roughly does the same as yours. If you’re in for more precision, use System.nanoTime() See also this question here: Time measuring overhead in Java
Using a multimedia timer should give you about 1000 events per second. This code should help you on the way. public delegate void TimerEventHandler(UInt32 id, UInt32 msg, ref UInt32 userCtx, UInt32 rsv1, UInt32 rsv2); /// <summary> /// A multi media timer with millisecond precision /// </summary> /// <param name=”msDelay”>One event every msDelay milliseconds</param> /// <param … Read more
As per MSDN: The Stopwatch measures elapsed time by counting timer ticks in the underlying timer mechanism. If the installed hardware and operating system support a high-resolution performance counter, then the Stopwatch class uses that counter to measure elapsed time. Otherwise, the Stopwatch class uses the system timer to measure elapsed time. Use the Frequency … Read more
Stopwatch is designed for this purpose and is one of the best ways to measure time execution in .NET. var watch = System.Diagnostics.Stopwatch.StartNew(); // the code that you want to measure comes here watch.Stop(); var elapsedMs = watch.ElapsedMilliseconds; Do not use DateTime to measure time execution in .NET. UPDATE: As pointed out by @series0ne in … Read more