1. Basic usage[edit | edit source]
When a GPU-based 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
gpu1=$(cat /sys/kernel/debug/gc/idle); \
sleep 4; \
gpu2=$(cat /sys/kernel/debug/gc/idle); \
echo $gpu1 $gpu2 | tr -d '\n' | tr -d ',' | tr -d 'ns' | awk -F" " '{printf("gpu load %.0f%%\n", ($10-$2)*100/($10+$12+$14+$16-$2-$4-$6-$8))}'; \
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%
2. Tips[edit | edit source]
- Stop monitoring the GPU load with the command "kill -9 `ps -o ppid= -C sleep`". This command may not work depending on your system configuration (busybox ps features, sh shell configuration...). Alternative method is to use the command "fg" followed by "CTRL+C" in your terminal.
- Debugfs[1] configuration needs to be enabled in order to be able to monitor the GPU load from the debug directory "/sys/kernel/debug/gc".
- Adjust the GPU load update period by modifying the "sleep" value (4 seconds in the above examples).
- Use the dmesg[2] command "dmesg -n8" to mix both user and kernel console outputs.
- The detailed calculation is: GPU load = (On-previous_On) / (Total-previous_Total) with Total=On+Off+Idle+Suspend, all variables coming from the command:
cat /sys/kernel/debug/gc/idle On: 2,071,009,284,477 ns Off: 11,480,071,864,263 ns Idle: 0 ns Suspend: 1,242,043,838,898 ns ...
3. References[edit | edit source]