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 module contains some methods which provides an interface to the scheduler and used to control how a process is allocated CPU time by the operating system.
os.sched_get_priority_max() method in Python is used to get the maximum priority value for the specified scheduling policy.
Note: This method is only available on some UNIX platforms.
Syntax: os.sched_get_priority_max(policy)
Parameter:
policy The scheduling policy whose maximum priority value is required.
Below are the scheduling policy constants that can be used as policy parameter value:
- os.SCHED_OTHER: It represents the default scheduling policy.
- os.SCHED_BATCH: It represents the scheduling policy for CPU-intensive processes that tries to preserve interactivity on the rest of the computer.
- os.SCHED_IDLE: It represents the scheduling policy for extremely low priority background tasks.
- os.SCHED_SPORADIC: It represents the scheduling policy for sporadic server programs.
- os.SCHED_FIFO: It represents First In First Out scheduling policy.
- os.SCHED_RR: It represents round-robin scheduling policy.
Return Type: This method returns an integer value which represents the maximum priority value for the specified scheduling policy.
# Python program to explain os.sched_get_priority_max() method # importing os module import os print("Below are the maximum priority\ value for different scheduling policy") # Get the maximum priority value for # first In First Out scheduling policy # os.SCHED_FIFO constant represents # first In First Out scheduling policy priority_max = os.sched_get_priority_max(os.SCHED_FIFO) print("First In First Out scheduling policy:", priority_max) # Get the maximum priority value for # round-robin scheduling policy # os.SCHED_RR constant represents the # round-robin scheduling policy priority_max = os.sched_get_priority_max(os.SCHED_RR) print("Round-robin scheduling policy:", priority_max) # Get the maximum priority value for # the default scheduling policy # os.SCHED_OTHER constant represents the # default scheduling policy. priority_max = os.sched_get_priority_max(os.SCHED_OTHER) print("Default scheduling policy.:", priority_max) # Get the maximum priority value # for scheduling policy for extremely # low priority background tasks # os.SCHED_IDLE constant represents the # scheduling policy for extremely low # priority background tasks. priority_max = os.sched_get_priority_max(os.SCHED_IDLE) print("Scheduling policy for extremely\ low priority background tasks:", priority_max) # Get the maximum priority value # for scheduling policy for CPU-intensive # processes that tries to preserve # interactivity on the rest of the computer. # os.SCHED_BATCH represents the # scheduling policy for CPU-intensive processes # that tries to preserve interactivity # on the rest of the computer priority_max = os.sched_get_priority_max(os.SCHED_BATCH) print("Scheduling policy for CPU-intensive processes:", priority_max) |
Below are the maximum priority value for different scheduling policy First In First Out scheduling policy: 99 Round-robin scheduling policy: 99 Default scheduling policy.: 0 Scheduling policy for extremely low priority background tasks: 0 Scheduling policy for CPU-intensive processes: 0
References: https://docs.python.org/3/library/os.html#os.sched_get_priority_max
