Os Sched Realtime

In this tutorial, you'll learn about How to Fix Real. We cover key concepts, practical examples, and best practices.

Fix real-time scheduling errors when SCHED_FIFO process hogs CPU blocking all lower priority tasks.

Quick Fix

Wrong

import os
if os.geteuid()==0:
    param=os.sched_param(99)  # max RT priority
    os.sched_setscheduler(0, os.SCHED_FIFO, param)
    while True: pass  # infinite loop blocks entire system!

SCHED_FIFO with max priority runs forever. Starves all other processes including kernel threads.

Right

import os, time
if os.geteuid()==0:
    param=os.sched_param(50)
    os.sched_setscheduler(0, os.SCHED_FIFO, param)
    # Always include yield/sleep in RT tasks:
    for _ in range(100):
        time.sleep(0.001)  # yields CPU
    # Or switch to SCHED_OTHER when done:
    param2=os.sched_param(0)
    os.sched_setscheduler(0, os.SCHED_OTHER, param2)

RT task yields periodically. System remains responsive. Non-RT tasks get CPU time.

Prevention

RT tasks (SCHED_FIFO/RR) must yield voluntarily. Include sleep, select, or sched_yield.

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