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yshui / picom

A lightweight compositor for X11 with animation support
https://picom.app/
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web animations are killing my gpu #1318

Open tx46 opened 2 months ago

tx46 commented 2 months ago

not sure if this is a configuration error or what.

even the smallest animations in my browser (happens to be firefox) cause about 50% gpu activity.

I have a GTX 1080 with nvidia proprietary drivers, vsync is on, backend is glx.

small animations, 24x24 pixels in my browser in this case, causes my gpu to go directly to 50%, spin up the fans and start working hard.

I suspect this is because the entire screen gets rerendered at 60hz continuously with the browser-animation running, which I thought was mitigated by use-damage (which I have set to true). killing picom reduces the gpu usage to 6-7%.

did I configure something incorrectly or what's going on?

absolutelynothelix commented 2 months ago

we use the x damage extension to know what parts of the screen have changed. however, it's mostly up to an application to report the damage. for example, xterm reports damage for each character while xfce4-terminal prefers to report damage for each line. i believe it's hard for browsers to report damage regions correctly as they display web pages so maybe the browser marks itself as entirely damaged when this small part changes. actually, you can see the damage if you use --monitor-repaint.

as for you, it's possible that damage support gets disabled as it requires some things to be available and some options not to be used. it'd be useful if you give picom's output with --log-level=info and your configuration. and maybe share your config too.

tx46 commented 2 months ago

thanks. after a bit of googling, the glx setup with nvidia seems to have issues with lag. i switched to xrender, turned vsync off, turned xrender-sync-fence on and enabled ForceCompositionPipeline in nvidia-settings for both monitors, which improved the situation drastically, but it's still too impressive and I feel like the monitors now have some input lag instead

yshui commented 2 months ago

I think unless you can do some GPU profiling, we don't have enough information to know what's going on here. even without use-damage, i think 50% usage is abnormal (unless you have multiple high resolution monitors?)