How measure CPU load of lpc55s16 microcontroller

[aravinth-kalai]

Hello everyone,

Currently I'm trying to measure CPU load of lpc55s16, Initially I tried to measure the CPU load by using the formula

((Total_thread_execution_time / total_CPU_up_time)*100)

using the k_uptime_get() API, but unfortunately k_uptime_get() is not accurate so my calculation is not working as expected, so is there any dedicated API is available in zephyr to measure CPU load? if yes please share that will be really helpful.

Thanks in advance!

[aravinth-kalai]

Hi @DerekSnell could you please help me on this issue.

[DerekSnell]

Hi @aravinth-kalai ,
I appears to me that with CONFIG_SCHED_THREAD_USAGE=y selected, you can call k_thread_runtime_stats_all_get() to get the CPU runtime stats. You can read about k_thread_runtime_stats for the values in that struct. And then I believe the CPU load would be execution_cycles / total_cycles.

Let us know how that works for you. Best regards

[aravinth-kalai]

Hi @DerekSnell ,

Thanks for your reply, After searching a lot finally I got this thread analyzer feature in zephyr that helps me to print CPU load of each thread and ideal thread.