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When a GPU animation is running on the display, the related GCNANO estimated GPU load can be monitored from the [[Vivante GCNANO GPU overview | GCNANO driver]] level, by using the following command: | When a GPU animation is running on the display, the related GCNANO estimated GPU load can be monitored from the [[Vivante GCNANO GPU overview | GCNANO driver]] level, by using the following command: | ||
{{Board$}} (while true; do (tr -d '\n' < /sys/kernel/debug/gc/idle | awk -F" " '{printf("gpu load %.0f%%\n", $6*100/($4-$2));}'); sleep 4; done) & | {{Board$}} (while true; do (tr -d '\n' < /sys/kernel/debug/gc/idle | awk -F" " '{printf("gpu load %.0f%%\n", $6*100/($4-$2));}'); sleep 4; done) & | ||
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Off: 0 ns | Off: 0 ns | ||
... | ... | ||
<noinclude> | |||
{{PublicationRequestId | 10256 | 2019-01-15 | PhilipS}} | |||
[[Category:GPU]] | |||
[[Category:How to trace and debug]] | |||
</noinclude> | |||
Revision as of 16:32, 4 October 2019
When a GPU animation is running on the display, the related GCNANO estimated GPU load can be monitored from the GCNANO driver level, by using the following command:
(while true; do (tr -d '\n' < /sys/kernel/debug/gc/idle | awk -F" " '{printf("gpu load %.0f%%\n", $6*100/($4-$2));}'); sleep 4; done) &
The GCNANO estimated GPU load is then periodically output in the user console as a percentage "%":
gpu load 75%
gpu load 75%
gpu load 75%
Notes:
- Stop monitoring the GPU load with the command "kill -9 `ps -o ppid= -C sleep`".
- Adjust the GPU load 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.
- The detailed calculation is: GPU load = On/(End-Start) with "On, End & Start" coming from the command:
cat /sys/kernel/debug/gc/idle
Start: 3488941301162 ns
End: 3549591148649 ns
On: 26672154276 ns
Off: 0 ns
...