C# console app to launch a process, wait for stdout, report a time.

Based on a Powershell script for Android, but instead runs a process on your system.

To use this tool to measure the time dotnet takes to print help, you could build and run this tool by doing:

$ git clone https://github.com/jonathanpeppers/measure-startup.git
$ dotnet run -- dotnet help

Everything after -- are arguments passed to measure-startup. I may eventually make this a .NET global tool to make this easier.

To measure a .NET MAUI app, first add a subscription to your main Page's Loaded event:

Loaded += (sender, e) => Dispatcher.Dispatch(() => Console.WriteLine("loaded"));

Dispatcher is used to give the app one pass for rendering/layout. In an app using BlazorWebView, you might consider logging this message when the web view finishes loading.

On Windows, build the app for Release mode, such as:

$ dotnet publish -f net6.0-windows10.0.19041.0 -c Release -p:PublishReadyToRun=true

You could then measure the startup time via:

$ dotnet run -c Release -- C:\src\YourApp\bin\Release\net6.0-windows10.0.19041.0\win10-x64\publish\YourApp.exe loaded

This launches YourApp.exe recording the time it takes for loaded to be printed to stdout:

0:00:07.0961628
Dropping first run...
0:00:01.4743315
0:00:01.4700848
0:00:01.4834235
0:00:01.4752893
0:00:01.4695317
Average(ms): 1474.53216
Std Err(ms): 2.4945246400065977
Std Dev(ms): 5.577926666602944

On macOS, build the app for either both architectures:

<RuntimeIdentifiers>maccatalyst-x64;maccatalyst-arm64</RuntimeIdentifiers>

Or build the app for Release mode for your machine's architecture, for an M1:

$ dotnet publish -f net6.0-maccatalyst -c Release -r maccatalyst-arm64

You could then measure the startup time via:

$ dotnet run -- ~/src/YourApp/bin/Release/net6.0-maccatalyst/maccatalyst-arm64/YourApp.app/Contents/MacOS/YourApp loaded 

This launches YourApp recording the time it takes for loaded to be printed to stdout:

0:00:03.3880364
Dropping first run...
0:00:01.8178456
0:00:01.7757709
0:00:01.7641941
0:00:01.836607
0:00:01.7377252
Average(ms): 1786.4285599999998
Std Err(ms): 18.006777122311476
Std Dev(ms): 40.26437770117651