Python os.sched_get_priority_max()用法及代碼示例

Python中的OS模塊提供了與操作係統進行交互的函數。操作係統屬於Python的標準實用程序模塊。該模塊提供了使用依賴於操作係統的函數的便攜式方法。

操作係統模塊包含一些方法，這些方法為調度程序提供接口，並用於控製操作係統如何為進程分配CPU時間。
os.sched_get_priority_max()Python中的方法用於獲取指定調度策略的最大優先級值。

注意：此方法僅在某些UNIX平台上可用。

用法： os.sched_get_priority_max(policy)

參數：
policy需要最大優先級值的調度策略。
以下是可用作策略參數值的調度策略常量：

操作係統SCHED_OTHER：它代表默認的調度策略。
操作係統SCHED_BATCH：它代表CPU密集型進程的調度策略，該策略試圖保留計算機其餘部分的交互性。
操作係統SCHED_IDLE：它表示優先級極低的後台任務的調度策略。
操作係統SCHED_SPORADIC：它代表零星服務器程序的調度策略。
操作係統SCHED_FIFO：表示先進先出調度策略。
os.SCHED_RR：表示round-robin調度策略。

返回類型：此方法返回一個整數值，該整數值表示指定的調度策略的最大優先級值。

代碼:os.sched_get_priority_max()方法的使用

# 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)

輸出：

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

參考文獻： https://docs.python.org/3/library/os.html#os.sched_get_priority_max

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