High CPU usage on Raspberry Pi

Describe the bug

A skeleton project (just the default project created by the VS extension, with a blank window) takes about 30% CPU usage on a Raspberry Pi 4.

Tested on net5.0 and netcoreapp3.1, Avalonia version 0.10.0 (the myget versions are failing to restore due to version mismatches).

I’ve attached a trace captured with dotnet trace which can be opened with PerfView here: trace.zip. A couple of screenshots below:

… it seems to be spending all of its time in unmanaged code, which dotnet trace isn’t particularly good at picking up!

strace shows a lot of activity, a good chunk of it cacheflush calls. I’ve attached the first 1s of strace output here: strace.txt.

To Reproduce Steps to reproduce the behavior:

1. Use VS to create a new empty Avalonia project.
2. Run this on a Rapsberry Pi 4
3. Observe CPU usage

Desktop (please complete the following information):

• OS: Raspbian 10
• Version: 0.10.0

[kekekeks]

Unmanaged code from dispatcher run loop is epoll_wait (basically sleep). Unmanaged code from SleepLoopRenderTimer is Thread.Sleep I wonder why it spends so much time finalizing SkiaSharp’s objects since we are disposing most of them except images

[canton7]

Oh! Having said that, a few deploys later and the CPU is down into the low single digits. I figure this is solved, thanks all!