Mono.Profiler.Android

Support for the Mono profiler in .NET 6 Android applications

Usage of the Mono Profiler

> dotnet new android
> dotnet add package Mono.Profiler.Android
> dotnet build -c Release -t:StartProfiling
# Wait until app launches, or you navigate to a screen
> dotnet build -c Release -t:StopProfiling

NOTE: you can also use dotnet new maui, build with -f net6.0-android.

This should produce profile.mlpd in the project's directory.

See Profiling Managed Code for more info.

Usage of the AOT Profiler

Use a Debug build, or set -p:AndroidEnableAotProfiler=true:

> dotnet add package Mono.AotProfiler.Android
> dotnet build -t:BuildAndStartAotProfiling
# Wait until app launches, or you navigate to a screen
> dotnet build -t:FinishAotProfiling

This will produce a custom.aprof in your project directory.

To use custom.aprof going forward, you can do:

<PropertyGroup>
  <AndroidUseDefaultAotProfile>false</AndroidUseDefaultAotProfile>
  <!-- Or if it is a .NET MAUI project -->
  <MauiUseDefaultAotProfile>false</MauiUseDefaultAotProfile>
</PropertyGroup>
<ItemGroup>
  <AndroidAotProfile Include="custom.aprof" />
</ItemGroup>

-p:RunAOTCompilation=true and -p:AndroidEnableProfiledAot=true are required to enable Profiled AOT. This should be enabled by default for Release builds.

Troubleshooting

If you have issues recording an AOT profile, such as:

Xamarin.Android.Application.targets(53,5): error MSB3075: The command ""aprofutil" -s -v -p 9999 -o "custom.aprof"" exited with code 5. Please verify that you have sufficient rights to run this command.

Check the following settings:

• If your app does not have the INTERNET permission, pass -p:AndroidNeedsInternetPermission=true.

The app will need to talk to aprofutil, so this permission is required.

• If you are running a Release build, make sure you have AOT turned off: -p:RunAOTCompilation=false

The Mono runtime can only report the list of JIT'd methods if the JIT is actually enabled. Turning off AOT is currently required when recording profiles.

MSBuild Properties

• $(AndroidMonoProfilers): list of Mono profilers to run. Defaults to calls,alloc,nocounters.

• $(AndroidMonoProfilerOutput): temporary location to save profile.mlpd on the Android device or emulator. Defaults to /sdcard/Download/profile.mlpd.

• $(AndroidMonoProfilerEnvironmentFile): location of the generated @(AndroidEnvironment) file. Defaults to $(IntermediateOutputPath)Mono.Profiler.Android.env.

To Build & Test this Repository

> dotnet build -c Release
> dotnet build -c Release samples/hellomaui/hellomaui.csproj -t:StartProfiling
> dotnet build -c Release samples/hellomaui/hellomaui.csproj -t:StopProfiling