Process in real time

Question

I am building a Pov Display using Raspberry pi 4 and a code written in Go. The raspberry pi has a sensor (btn) to know when it displays the code. The problem is my raspberry won't execute the code at same delay every detection of (btn), therefore I see dots and some time lines. I want just to make the raspberry pi display the code written in Go with same delay every detection to see just dots. is it possible to tell the raspberry to execute my process in real-time without interrupting like execute the process in one core and use the others for system ?

Answer 1

You Need to exclude one CPU from the Overall scheduling in your /boot/cmdline.txt, afterwards you can assign the process to it via

taskset

as you already found out. To exclude a CPU, add the boot Parameter

isolcpus=N

The Number (N) is 0-based.