Jonathan Peppers jonathanpeppers

Consider the XAML:

<VerticalStackLayout>
  <Image Source="foo.png" />
</VerticalStackLayout>

 graph TD;

Part of the docs are here:

https://github.com/xamarin/xamarin-android/blob/main/Documentation/guides/tracing.md#how-to-get-gc-memory-dumps

But this expands on this, with a list of steps I do to profile .NET MAUI.

An overview:

Build & Run the Device Tests on Catalyst
Attach dotnet-trace with some settings

How I Work on .NET MAUI

This is a description on how I build/contribute to .NET MAUI, it may differ from DEVELOPMENT.md. I thought I would write this down in case it helps someone.

Building

If I'm testing the provisioning of .NET and workloads, I may run:

These instructions are also on this MS internal loop.

.NET SDK

For now, use a specific build of the .NET SDK:

VS Windows

Install Project System Tools for VS 2022.

Open View > Other Windows > Build Logging:

Hit the "play" button:

.NET Workload Troubleshooting

To install the maui workload, you have two options:

dotnet workload install commands
Visual Studio on Windows can install .msi files for each workload pack. Note that the concept of a "Visual Studio workload" is different than a ".NET workload".

VS for Mac's installer and updater use dotnet workload install commands. It's considerably simpler to get a Mac machine to a clean state.

Mac

How does Java interop work in .NET 6?

Most of this also applies to Xamarin.Android, as we have nearly the same implementation.

Let's start with a simple Android API call:

Android.Util.Log.Debug ("MYTAG", "MyMessage");

Over December, I have been able to work on Xamarin.Forms + Android startup perf. Here is the initial results I'm seeing with the accumulation of all my changes.

All runs were on a Pixel 3 XL

16.4 Blank Forms App template, Xamarin.Forms 4.4.0.991265

Debug:

01-15 23:46:01.157  1473  1503 I ActivityTaskManager: Displayed com.xamarin.forms.helloforms/crc6450e568c951913723.MainActivity: +859ms
01-15 23:46:04.919  1473  1503 I ActivityTaskManager: Displayed com.xamarin.forms.helloforms/crc6450e568c951913723.MainActivity: +843ms

	{
	"$schema": "https://aka.ms/terminal-profiles-schema",
	"globals" :
	{
	"alwaysShowTabs" : true,
	"defaultProfile" : "{61c54bbd-c2c6-5271-96e7-009a87ff44bf}",
	"initialCols" : 120,
	"initialRows" : 30,
	"keybindings" :
	[

	SRC_DIR="/Users/jopepper/src"
	XA_DIR="$SRC_DIR/xamarin-android"
	XA_TOOLCHAIN_DIR="/Users/jopepper/android-toolchain"
	XA_ANDROID_SDK_DIR="$XA_TOOLCHAIN_DIR/sdk"
	JAVA_HOME="$XA_TOOLCHAIN_DIR/jdk"
	alias xabuild="$XA_DIR/bin/Debug/bin/xabuild"
	alias xabuildr="$XA_DIR/bin/Release/bin/xabuild"
	alias adb="$XA_ANDROID_SDK_DIR/platform-tools/adb"
	alias java="$JAVA_HOME/bin/java"
	alias javac="$JAVA_HOME/bin/javac"