Revision as of 15:42, 5 June 2023 by Registered User (→Notes)
1. Basic usage
When an animation is running on the display, the related framerate can be monitored from the display driver level thanks to the command:
(while true; do export fps=`cat /sys/kernel/debug/dri/0/state | grep fps -m1 | grep -o '[0-9]\+'`; echo display ${fps}fps; sleep 4; done) &
The display framerate is then periodically output in the user console in "fps" (frames per second):
display 50fps display 50fps display 50fps
2. Advance usage
The display can be composed of several layers which can be refreshed independently. Associated framerates can be monitored from the display driver level thanks to the command:
(while true; do cat /sys/kernel/debug/dri/0/state | sed -nE '/user|plane-/p' | sed -e ':a;N;$!ba;s/\n\t//g;s/user_updates=/ /g;s/plane-/display layer/g;' | sed -e 's/^.\{,11\}//g'; sleep 4; done)
display layer0 60fps display layer1 25fps display layer2 30fps
3. How stop the monitoring?
- Stop monitoring the framerate with the command "kill -9 `ps -o ppid= -C sleep`".
- Adjust the framerate update period by modifying the "sleep" value (4 seconds in the example).
- Use the command "dmesg -n8" to mix both user and kernel console outputs.
- Debugfs configuration needs to be enabled.