使用三个调度算法的linux进程调度算法模拟代码

好的，下面是使用三种常见的 Linux 进程调度算法（先来先服务、最短作业优先和时间片轮转）的模拟代码：

import random

# 定义进程类
class Process:
    def __init__(self, pid, arrival_time, burst_time):
        self.pid = pid
        self.arrival_time = arrival_time
        self.burst_time = burst_time
        self.waiting_time = 0
    
    def run(self):
        self.burst_time -= 1
    
    def is_finished(self):
        return self.burst_time == 0


# 定义先来先服务调度算法模拟函数
def fcfs_simulate(processes):
    current_time = 0
    total_waiting_time = 0
    total_processes = len(processes)
    completed_processes = []
    
    while len(completed_processes) < total_processes:
        available_processes = [p for p in processes if p.arrival_time <= current_time and p not in completed_processes]
        
        if available_processes:
            next_process = min(available_processes, key=lambda p: p.arrival_time)
            next_process.run()
            
            if next_process.is_finished():
                completed_processes.append(next_process)
                total_waiting_time += next_process.waiting_time
            else:
                for p in available_processes:
                    if p != next_process:
                        p.waiting_time += 1
        
        current_time += 1
    
    average_waiting_time = total_waiting_time / total_processes
    return average_waiting_time


# 定义最短作业优先调度算法模拟函数
def sjf_simulate(processes):
    current_time = 0
    total_waiting_time = 0
    total_processes = len(processes)
    completed_processes = []
    
    while len(completed_processes) < total_processes:
        available_processes = [p for p in processes if p.arrival_time <= current_time and p not in completed_processes]
        
        if available_processes:
            next_process = min(available_processes, key=lambda p: p.burst_time)
            next_process.run()
            
            if next_process.is_finished():
                completed_processes.append(next_process)
                total_waiting_time += next_process.waiting_time
            else:
                for p in available_processes:
                    if p != next_process:
                        p.waiting_time += 1
        
        current_time += 1
    
    average_waiting_time = total_waiting_time / total_processes
    return average_waiting_time


# 定义时间片轮转调度算法模拟函数
def round_robin_simulate(processes, time_quantum):
    current_time = 0
    total_waiting_time = 0
    total_processes = len(processes)
    completed_processes = []
    
    while len(completed_processes) < total_processes:
        available_processes = [p for p in processes if p.arrival_time <= current_time and p not in completed_processes]
        
        if available_processes:
            next_process = available_processes[0]
            next_process.run()
            
            if next_process.is_finished():
                completed_processes.append(next_process)
                total_waiting_time += next_process.waiting_time
            else:
                for p in available_processes[1:]:
                    p.waiting_time += time_quantum
        
        current_time += time_quantum
    
    average_waiting_time = total_waiting_time / total_processes
    return average_waiting_time


# 创建进程列表
processes = [
    Process(1, 0, 5),
    Process(2, 2, 3),
    Process(3, 4, 4),
    Process(4, 6, 2),
]

# 运行先来先服务调度算法模拟
average_waiting_time_fcfs = fcfs_simulate(processes)
print(f"Average waiting time (FCFS): {average_waiting_time_fcfs}")

# 运行最短作业优先调度算法模拟
average_waiting_time_sjf = sjf_simulate(processes)
print(f"Average waiting time (SJF): {average_waiting_time_sjf}")

# 运行时间片轮转调度算法模拟
time_quantum = 2
average_waiting_time_rr = round_robin_simulate(processes, time_quantum)
print(f"Average waiting time (Round Robin): {average_waiting_time_rr}")

这段代码演示了三种不同的调度算法：先来先服务（FCFS）、最短作业优先（SJF）和时间片轮转（Round Robin）。您可以根据需要修改进程列表和时间片大小来进行模拟，并获取每种算法的平均等待时间。请注意，这只是一个简单的示例，实际的调度算法实现要更加复杂。