docker stats flickers

[ahmelsayed]

Environment

Windows build number: 10.0.18922.1000
Windows Terminal version (if applicable): 0.2.1715.0

Any other software? WSL2, zsh, docker

Steps to reproduce

docker run --rm -d alpine sleep 20s
docker run --rm -d alpine sleep 20s
docker stats

Expected behavior

On GNOME Terminal the output is displayed without flickering.

Actual behavior

On Windows Terminal it flickers.

I tried to record a GIF, but my screen recorder doesn't show the flickering. It only records at 10 fps though.

[JushBJJ]

Does it flicker with the old cmd? If it does still then report the issue at the WSL repo.

[miniksa]

Record with your smartphone and upload a video?

[ahmelsayed]

https://ahmelsayed.blob.core.windows.net/public/IMG_0144.mp4

The first is Windows Terminal, then I switch the KVM to a linux box running GNOME Terminal.

[thorerik]

I wonder if this is related to the draw performance in general?
It can also be observed by running, e.g. sudo yast2 on OpenSuSE Leap 15.1 in WSL:
In Terminal:

In standard conhost:

the issue becomes more apparent when running the terminal emulator in a larger size.

[JushBJJ]

That's quite weird. I think it has to do something with the rendering that makes it flicker.

[DHowett-MSFT]

Until proven otherwise, I'll dupe this to #778. Thanks for all the cool repro cases!

[skyline75489]

@miniksa I'm gonna comment here so it does not mess with the pile of comments in #5185.

I've also seen this with iTerm2 on macOS when I'm in a SSH session on remote machines and the network is slow. The routine of docker stats is basically repainting all the stats to the screen over and over again. Natually it should flicker if the duration between each painting is noticeably long. I begin to doubt that this is rendering-related. We can improve rendering performance for sure. But the docker stats may still be flickering, even in iTerm2.

[miniksa]

@skyline75489, OK. I might not worry that hard about it right now then and just get the differential work in and let a future issue be opened fresh if there is still a real problem. Thanks!

[tu-nv]

@miniksa In my case, New Terminal has a serious flickering issue that makes docker stats not usable, but the wsltty (https://github.com/mintty/wsltty) does not have that issue. I am running win 10, terminal preview Version: 1.4.2652.0. And yes, I do ssh to another machine and fire tmux there, open docker stats in one tmux panel.

[jherico]

I found this and after reading through the linked comments I think this is really a docker stats issue rather than a windows termainl issue. I was able to reproduce it on ConEmu.

[ClassicDarkChocolate]

I found that when I right click on tab to open context menu. When the context menu is in open state, the terminal updates screen without flickering.