Calculate the execution time of a method

Question

Possible Duplicate     How do I measure how long a function is running      I have an I O time-taking method which copies data from a location to another  What s the best and most real way of calculating the execution time  Thread  Timer  Stopwatch  Any other solution  I want the most exact one  and briefest as much as possible

User · Accepted Answer

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 the comments section  If you want a real precise measurement of the execution of some code  you will have to use the performance counters that s built into the operating system  The following answer contains a nice overview

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Following this Microsoft Doc   using System  using System Diagnostics  using System Threading  class Program       static void Main string   args                Stopwatch stopWatch   new Stopwatch            stopWatch Start            Thread Sleep 10000           stopWatch Stop               Get the elapsed time as a TimeSpan value          TimeSpan ts   stopWatch Elapsed              Format and display the TimeSpan value          string elapsedTime   String Format   0 00   1 00   2 00   3 00                ts Hours  ts Minutes  ts Seconds              ts Milliseconds   10           Console WriteLine  RunTime     elapsedTime             Output  RunTime 00 00 09 94

User · Answer

using System Diagnostics   class Program        static void Test1                 for  int i   1  i  lt   100  i                          Console WriteLine  Test1     i                     static void Main string   args                 Stopwatch sw   new Stopwatch            sw Start            Test1            sw Stop            Console WriteLine  Time Taken-- gt  0   sw ElapsedMilliseconds

User · Answer

StopWatch class looks for your best solution   Stopwatch sw   Stopwatch StartNew    DoSomeWork    sw Stop     Console WriteLine  Time taken   0 ms   sw Elapsed TotalMilliseconds     Also it has a static field called Stopwatch IsHighResolution  Of course  this is a hardware and operating system issue      Indicates whether the timer is based on a high-resolution performance   counter

User · Answer

From personal experience  the System Diagnostics Stopwatch class can be used to measure the execution time of a method  however  BEWARE  It is not entirely accurate   Consider the following example   Stopwatch sw   for int index   0  index  lt  10  index          sw   Stopwatch StartNew        DoSomething        Console WriteLine sw ElapsedMilliseconds      sw Stop      Example results  132ms 4ms 3ms 3ms 2ms 3ms 34ms 2ms 1ms 1ms   Now you re wondering   well why did it take 132ms the first time  and significantly less the rest of the time    The answer is that Stopwatch does not compensate for  background noise  activity in  NET  such as JITing  Therefore the first time you run your method   NET JIT s it first  The time it takes to do this is added to the time of the execution  Equally  other factors will also cause the execution time to vary   What you should really be looking for absolute accuracy is Performance Profiling   Take a look at the following   RedGate ANTS Performance Profiler is a commercial product  but produces very accurate results  - Boost the performance of your applications with  NET profiling  Here is a StackOverflow article on profiling  - What Are Some Good  NET Profilers   I have also written an article on Performance Profiling using Stopwatch that you may want to look at - Performance profiling in  NET

User · Answer

StopWatch will use the high-resolution counter     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 and IsHighResolution fields to determine the precision   and resolution of the Stopwatch timing implementation    If you re measuring IO then your figures will likely be impacted by external events  and I would worry so much re  exactness  as you ve indicated above   Instead I d take a range of measurements and consider the mean and distribution of those figures

User · Answer

If you are interested in understand performance  the best answer is to use a profiler   Otherwise  System Diagnostics StopWatch provides a high resolution timer

[c#] Calculate the execution time of a method

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