Os Sched Nice Ionice

In this tutorial, you'll learn about How to Fix I/O Priority Errors. We cover key concepts, practical examples, and best practices.

Fix i/o priority errors when nice value doesn't affect I/O priority causing disk starvation.

Quick Fix

Wrong

os.nice(19)  # low CPU priority but high I/O priority!

Process with nice 19 still gets same I/O priority as interactive processes. Can hog disk.

Right

import os
# Nice only affects CPU:
os.nice(10)
# Set I/O priority via ionice:
try:
    import ctypes
    libc=ctypes.CDLL('libc.so.6')
    # IOPRIO_CLASS_IDLE = 3
    libc.ioprio_set(os.IOPRIO_WHO_PROCESS, 0, (3<<13)|7)  # idle I/O class
except: print('ioprio_set not available (need CAP_SYS_ADMIN)')

Process has low CPU and low I/O priority. Background tasks don't starve interactive I/O.

Prevention

I/O priority is separate from CPU priority. Set both with nice+ionice or cgroups.

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