xPC target kernel jitter

Hi folks,

I have an xPC target and slrt 2015b kernel loaded on it. Sample time of my model is 1ms and system is configured to use its own timer. What amount of jitter I should expect in such setup? Including both hardware and RT kernel jitter?

Answer 1

[Anshuman]

Hello,

The jitter you experience will depend on several factors, including the hardware capabilities and the efficiency of the real-time kernel. Simulink Real-Time is designed to minimize jitter, often achieving jitter in the microsecond range. For a well-configured system, jitter might be as low as a few microseconds (typically 10-20 µs).The actual jitter can also be influenced by the hardware, such as the processor speed, memory access times, and other peripheral activities.

In a well-optimized setup with dedicated real-time hardware, you might expect overall jitter (including both hardware and RT kernel) to be less than 50 µs. High CPU usage and extensive I/O operations can increase the jitter. Additionally, efficient interrupt handling is crucial for minimizing jitter.

Hope it helps!