LP-AM243: Cpu-load analysis with TaskP_loadGetTotalCpuLoad() (MCU+ SDK TaskP)

coderAkdr

Part Number: LP-AM243

Tool/software:

Hi there;

I want to analyze the CPU-load for each core in the project I developed on the LP-Am2434 eval board. For this, I use the TaskP_loadGetTotalCpuLoad() method in the MCU+ SDK and transfer the values I get via UART.

When I analyze the values I save, I see an ever-increasing CPU-load value on core0-0, where my ethercat slave stack application is running. It increases rapidly at first and then slowly until the value of 99.8%.

The fact that the cpu-load value was very high caused me to question the method I used. Do you think it is correct to analyze cpu-load with this method? What other ways do you recommend?

Best
Kadir

9 months ago

0 Swargam Anil 9 months ago

TI__Mastermind 49336 points

Hello Kadir,

I am looking at your queries and you may expect reply by Monday.

Regards,

Anil.

0 Swargam Anil 9 months ago in reply to Swargam Anil

TI__Mastermind 49336 points

Hello Kadir,

The above API is used to measure the CPU load, and we need to check why the ethercat slave task is consuming a higher CPU load.

May I know how many tasks are running ? What is the Base RTOS schedular time ?

Regards,

Anil.

0 coderAkdr 9 months ago in reply to Swargam Anil

Prodigy 210 points

Hello Anil,

Thanks for your response. Can you please tell how to see Base RTOS schedular time. My Ethercat frequency is 4khz

There are 13 tasks running, 1 is for monitoring CPU-load which is not creating of CPU-load.

Best
Kadir

0 Aaron Thomas 9 months ago in reply to coderAkdr

TI__Genius 10015 points

Hi Kadir,

May I know which EtherCAT application you’re running and the SDK version?

Regards,
Aaron

0 coderAkdr 9 months ago in reply to Aaron Thomas

Prodigy 210 points

Hi Aaron;

We cusomized ethercat slave simple example and added more dictionary objects.
This is industrial communication sdk in the subfolder of motor_control_sdk_am243x_09_02_00_09.

I saw in some sources that MainLoop is called quite fast. Do you think 98% CPU load is an unacceptable value?(I think should be unacceptable) If you measured it in your examples, could you please share what it is?

Regards
Kadir

0 Aaron Thomas 9 months ago in reply to coderAkdr

TI__Genius 10015 points

Thank you Kadir. I’ll assign this to the stack experts who can comment on this further.

Regards,
Aaron

0 coderAkdr 9 months ago in reply to Aaron Thomas

Prodigy 210 points

Thanks. If you can share the CPU-load value of ethercat simple slave example that would be great for me.

+1 Harsha Begihally Shanmukhaswamy 9 months ago in reply to coderAkdr

TI__Expert 3350 points

Hello Kadir,

Due to the architecture of the EtherCAT SubDevice stack, the CPU load cannot be reliably measured. In order to measure the CPU load, you can introduce a delay on 1ms in the EC_SLV_APP_SS_loopTask() and this can be done by replacing the OSAL_SCHED_yield() with OSAL_SCHED_sleepUs(1000).

Also, call the API TaskP_loadResetAll() after the call to TaskP_loadGetTotalCpuLoad(). This will reset task load statistics otherwise until it is reset the load statistics keep getting accumulated. Please refer CPU/Task Load APIs.

Kind Regards,

0 coderAkdr 9 months ago in reply to Harsha Begihally Shanmukhaswamy

Prodigy 210 points

Thank you Harsha...!

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LP-AM243: Cpu-load analysis with TaskP_loadGetTotalCpuLoad() (MCU+ SDK TaskP)