Python | os.sched_setaffinity() method Last Updated : 02 Nov, 2021 Comments Improve Suggest changes Like Article Like Report OS module in Python provides functions for interacting with the operating system. OS comes under Python’s standard utility modules. This module provides a portable way of using operating system dependent functionality. os.sched_setaffinity() method in Python is used to set the CPU affinity mask of a process indicated by the specified process id. A process's CPU affinity mask determines the set of CPUs on which it is eligible to run. Note: This method is only available on some UNIX platforms. Syntax: os.sched_setaffinity(pid, mask) Parameter: pid: The process id of the process whose CPU affinity mask is to be set required. Process's CPU affinity mask determines the set of CPUs on which it is eligible to run. A pid of 0 represents the calling process. mask: An iterable of integers representing the set of CPUs to which the process should be restricted. Return Type: This method does not return any value. Code: Use of os.sched_setaffinity() method Python3 # Python program to explain os.sched_setaffinity() method # importing os module import os # Get the number of CPUs # in the system # using os.cpu_count() method print("Number of CPUs:", os.cpu_count()) # Get the set of CPUs # on which the calling process # is eligible to run. using # os.sched_getaffinity() method # 0 as PID represents the # calling process pid = 0 affinity = os.sched_getaffinity(pid) # Print the result print("Process is eligible to run on:", affinity) # Change the CPU affinity mask # of the calling process # using os.sched_setaffinity() method # Below CPU affinity mask will # restrict a process to only # these 2 CPUs (0, 1) i.e process can # run on these CPUs only affinity_mask = {0, 1} pid = 0 os.sched_setaffinity(0, affinity_mask) print("CPU affinity mask is modified for process id % s" % pid) # Now again, Get the set of CPUs # on which the calling process # is eligible to run. pid = 0 affinity = os.sched_getaffinity(pid) # Print the result print("Now, process is eligible to run on:", affinity) Output: Number of CPUs: 4 Process is eligible to run on: {0, 1, 2, 3} CPU affinity mask is modified for process id 0 Now, process is eligible to run on: {0, 1} References: https://docs.python.org/3/library/os.html#os.sched_setaffinity https://linux.die.net/man/2/sched_getaffinity Create Quiz Comment I ihritik Follow 0 Improve I ihritik Follow 0 Improve Article Tags : Python python-os-module Explore Python FundamentalsPython Introduction 2 min read Input and Output in Python 4 min read Python Variables 4 min read Python Operators 4 min read Python Keywords 2 min read Python Data Types 8 min read Conditional Statements in Python 3 min read Loops in Python - For, While and Nested Loops 5 min read Python Functions 5 min read Recursion in Python 4 min read Python Lambda Functions 5 min read Python Data StructuresPython String 5 min read Python Lists 4 min read Python Tuples 4 min read Python Dictionary 3 min read Python Sets 6 min read Python Arrays 7 min read List Comprehension in Python 4 min read Advanced PythonPython OOP Concepts 11 min read Python Exception Handling 5 min read File Handling in Python 4 min read Python Database Tutorial 4 min read Python MongoDB Tutorial 3 min read Python MySQL 9 min read Python Packages 10 min read Python Modules 3 min read Python DSA Libraries 15 min read List of Python GUI Library and Packages 3 min read Data Science with PythonNumPy Tutorial - Python Library 3 min read Pandas Tutorial 4 min read Matplotlib Tutorial 5 min read Python Seaborn Tutorial 3 min read StatsModel Library - Tutorial 3 min read Learning Model Building in Scikit-learn 6 min read TensorFlow Tutorial 2 min read PyTorch Tutorial 6 min read Web Development with PythonFlask Tutorial 8 min read Django Tutorial | Learn Django Framework 7 min read Django ORM - Inserting, Updating & Deleting Data 4 min read Templating With Jinja2 in Flask 6 min read Django Templates 5 min read Build a REST API using Flask - Python 3 min read Building a Simple API with Django REST Framework 3 min read Python PracticePython Quiz 1 min read Python Coding Practice 1 min read Python Interview Questions and Answers 15+ min read Like