Can I configure slint fps or traceing slint backend log, just like QT's QT_LOGGING_RULES

[fluolite]

I run slint-ui in different devices, but the experience varies greatly!

Device-1
system:  Linux-x86_64（Intel）,  x11 desktop system
slint backend: "backend-winit"
slint renderer: "renderer-skia"
render result:     60fps
 
Device-2
system:  Linux-aarch64（rockchip RK3568）,  has egl, gles2, gbm, drm
slint backend: "backend-linuxkms-noseat"
slint renderer: "renderer-skia" or "renderer-software"
render result:     1-6 fps
But QT eglfs render result: 60fps

Did I configure slint something wrong or How can I detect the problem?
Can I traceing slint backend log, just like QT's QT_LOGGING_RULES ?

[tronical]

It's hard to say what might be causing that. How does CPU usage compare? How does your Slint scene look like, and how does it compare to the same scene in QML?

[fluolite]

CPU usage:

It is the same result for a single slint helloworld exsample.
It's easy to run 60fs with complex scene with QML（backend: EGLFS）.

This is the board SoC info.
https://www.rock-chips.com/uploads/pdf/2022.8.26/191/RK3568%20Brief%20Datasheet.pdf

[fluolite]

How can I configure slint-ui backend and renderer, just like QT's EGLFS?

[tronical]

That's a relatively low CPU usage, unless... the 25% mean that one of the four cores is running at 100%. Do you know how this is displayed in top for you? Either way, it's odd.

So just to double check:

You're showing a scene like this?
What value exactly do you set SLINT_DEBUG_PERFORMANCE to in order to measure the fps?

[fluolite]

I made a mistake, slint render as software renderer because EglDisplay create failed

[glutin ](rust-windowing/glutin#1708)

[tronical]

Good find. Let's continue the discussion there.