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When an animation is running on the display, the related framerate can be monitored from the [[DRM KMS overview | display driver]] level thanks to the command: | When an animation is running on the display, the related framerate can be monitored from the [[DRM KMS overview | display driver]] level thanks to the command: | ||
{{Board$}} (while true; do export fps=`cat /sys/kernel/debug/dri/0/state | grep fps -m1 | grep -o '[0-9]\+'`; echo display ${fps}fps; sleep 4; done) & | {{Board$}} (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) & | ||
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* Use the command "dmesg -n8" to mix both user and kernel console outputs. | * Use the command "dmesg -n8" to mix both user and kernel console outputs. | ||
* [[Debugfs]] configuration needs to be enabled. | * [[Debugfs]] configuration needs to be enabled. | ||
<noinclude> | |||
[[Category:How to trace and debug]] | |||
[[Category:DRM KMS]] | |||
{{PublicationRequestId | 9899 | 2018-12-06 | AlainF}} | |||
</noinclude> | |||
Latest revision as of 17:07, 16 January 2020
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
Notes:
- 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.