如何在实时优先级Linux上运行Python程序

Question

I am writing a python program that is latency sensitive (taking stereo images simultanously from 2 cameras).

I am reading up on real time operating systems and I would like to run my python program with SCHED_FIFO or FF priority or something similar. I am using Rasbian(debian) with RT_PREMPT kernal.

Is this the right approach? How do I run my python program with real time (SCHED_FIFO) priority?

attempt

sudo chrt --rr 50 python3 loopExample.py

Answer 1

In order to do true realtime operations, you might want to consider running a realtime Linux kernel. It can make a dramatic difference in terms of max latency and give you a more consistent response time, as you can see from this benchmark test on the Pi

You can get the Raspberry PI's version of the RealTime kernel here . You will need to compile and install it, this should help get you there .

In terms of updating a process' priority under Linux, this is called the "nice" value. The range of values available is between -20 for highest priority and 19 for lowest. You can run your Python application with a set nice value at the time of invocation using sudo nice -n -20 python app.py