C# Tip: use Miniprofiler instead of Stopwatch to profile code performance

2022-09-13 2 min read CSharp Tips

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Do you need to tune up the performance of your code? You can create some StopWatch objects and store the execution times or rely on external libraries like MiniProfiler.

Note: of course, we’re just talking about time duration, and not about memory usage!

How to profile code using Stopwatch

A Stopwatch object acts as a (guess what?) stopwatch.

You can manually make it start and stop, and keep track of the elapsed time:

Stopwatch sw = Stopwatch.StartNew();
DoSomeOperations(100);
var with100 = sw.ElapsedMilliseconds;


sw.Restart();
DoSomeOperations(2000);
var with2000 = sw.ElapsedMilliseconds;

sw.Stop();

Console.WriteLine($"With 100: {with100}ms");
Console.WriteLine($"With 2000: {with2000}ms");

It’s useful, but you have to do it manually. There’s a better choice.

How to profile code using MiniProfiler

A good alternative is MiniProfiler: you can create a MiniProfiler object that holds all the info related to the current code execution. You then can add some Steps, which can have a name, and even nest them.

Finally, you can print the result using RenderPlainText.

MiniProfiler profiler = MiniProfiler.StartNew();

using (profiler.Step("With 100"))
{
    DoSomeOperations(100);
}


using (profiler.Step("With 2000"))
{
    DoSomeOperations(2000);
}

Console.WriteLine(profiler.RenderPlainText());

You won’t anymore stop and start any StopWatch instance.

You can even use inline steps, to profile method execution and store its return value:

var value = profiler.Inline(() => MethodThatReturnsSomething(12), "Get something");

Here I decided to print the result on the Console. You can even create HTML reports, which are quite useful when profiling websites. You can read more here, where I experimented with MiniProfiler in a .NET API project.

Here’s an example of what you can get:

MiniProfiler API report

Code4IT

C# Tip: use Miniprofiler instead of Stopwatch to profile code performance

How to profile code using Stopwatch

How to profile code using MiniProfiler

Further readings