How to improve the real-time performance of Raspberry Pi？

I would like to know how to improve the real-time performance of raspberry pi？

The Raspberry Pi runs in the Linux system, and the real-time performance is not high.

Are there any improvement method for simulink?

For example： task priorities, running code with a dedicated kernel, or patching the kernel?

What should I do? Can you give me some advice?

Thanks!

Answer 1

[Rijuta]

Hi Xiaohu,

I understand that you want to improve the real time performance of Raspberry Pi when running Simulink Models. There are several approaches you can consider:

1. One option is to use a real-time operating system like Xenomai or PREEMPT-RT. These RTOSs provide real-time capabilities by patching the Linux kernel and adding a real-time scheduler. This can help reduce latency and improve the determinism of your Simulink model execution.

2. Assigning appropriate priorities to tasks in your Simulink model can prioritize critical tasks that require real-time response to ensure they are executed with minimal delay. You can set task priorities using the " Rate Transition" parameter in Simulink.

3. Ensure that you are using a Raspberry Pi model that is suitable for real-time applications. Models like Raspberry Pi 3B+ or Raspberry Pi 4 have better processing capabilities compared to earlier models.

4. Adjust the Linux system configuration to enhance real-time performance. This can include disabling unnecessary services, reducing the system load, and optimizing kernel parameters such as the scheduler and interrupt handling.

I hope implementing the above techniques help you improve the real-time capabilities of the Raspberry Pi when running Simulink models.