算法性能C＃

Question

I want to measure the performance of my code.. if I consider the time as a criterion I have this code

DateTime oldDate = new DateTime(2002,7,15);
DateTime newDate = DateTime.Now;
// Difference in days, hours, and minutes.
TimeSpan ts = newDate - oldDate;
// Difference in days.
int differenceInDays = ts.Milliseconds ;

Question1: is this the only way that I can test the performance of my algorithm ? Question2: what are other criterion that C# provide to test the performance? Regards

Answer 1

Its always better to use System.Diagnostics.Stopwatch

Check this link for more details. Performance Tests: Precise Run Time Measurements with System.Diagnostics.Stopwatch

Answer 2

use Stopwatch class

//Start a stopwatch:

var watch = Stopwatch.StartNew();

//Execute the code

watch.Stop(); //This stops the watch

The elapsed time can be measured by using Elapsed, ElapsedMilliSeconds and ElapsedTicks properties.

Answer 3

Try using the StopWatch class. It has significantly higher resolution than the DateTime and TimeSpan classes.

Additionally, you can look at the Windows Performance Counters as a way of measuring performance while your application is running so that you can monitor the health of your application.

Answer 4

You can use a profiler (tool based, for example with SlimTune ) or measure the time with System.Diagnostics.Stopwatch . It has better precision than the DateTime hack.

Answer 5

If you truly want to use DateTime (because it's easier to use), use UtcNow instead of Now . It's a little faster (because current date and time are stored in UTC format in Windows) and as an added bonus, you can test your program around the DST change time :-).

But yeah, use Stopwatch .

Stopwatch watch = Stopwatch.StartNew();
watch.Stop()

Ah... very important... your code is wrong

ts.TotalMilliseconds

I did the same error yesterday, but I was measuring times around the second, so it was more difficult to notice :-)