编程实现:先来先服务调度算法、短 进程优先调度算法、时间片轮转调度算法和优先级调度算法(抢占式)、高响应 比优先调度算法。

时间: 2023-07-31 10:05:23 浏览: 50
先来先服务调度算法(FCFS): ```python def fcfs(processes): """ First-Come, First-Served (FCFS) scheduling algorithm Input: processes: a list of dictionaries containing process information Each dictionary should have the following keys: - 'pid': process ID - 'arrival_time': arrival time of the process - 'burst_time': burst time of the process Output: a list of tuples containing the order in which the processes are executed Each tuple should have the following format: (process ID, start time, end time) """ # Sort the processes by arrival time sorted_processes = sorted(processes, key=lambda x: x['arrival_time']) # Initialize the start and end times of the first process start_time = sorted_processes[0]['arrival_time'] end_time = start_time + sorted_processes[0]['burst_time'] # Initialize the order list with the first process order = [(sorted_processes[0]['pid'], start_time, end_time)] # Loop through the remaining processes and update the start and end times for i in range(1, len(sorted_processes)): if sorted_processes[i]['arrival_time'] > end_time: # If there is a gap between processes, update the start time start_time = sorted_processes[i]['arrival_time'] else: # If the next process arrives before the current process finishes, # update the end time start_time = end_time end_time = start_time + sorted_processes[i]['burst_time'] # Add the process to the order list order.append((sorted_processes[i]['pid'], start_time, end_time)) return order ``` 短进程优先调度算法(SJF): ```python def sjf(processes): """ Shortest-Job-First (SJF) scheduling algorithm Input: processes: a list of dictionaries containing process information Each dictionary should have the following keys: - 'pid': process ID - 'arrival_time': arrival time of the process - 'burst_time': burst time of the process Output: a list of tuples containing the order in which the processes are executed Each tuple should have the following format: (process ID, start time, end time) """ # Sort the processes by arrival time and burst time sorted_processes = sorted(processes, key=lambda x: (x['arrival_time'], x['burst_time'])) # Initialize the start and end times of the first process start_time = sorted_processes[0]['arrival_time'] end_time = start_time + sorted_processes[0]['burst_time'] # Initialize the order list with the first process order = [(sorted_processes[0]['pid'], start_time, end_time)] # Loop through the remaining processes and update the start and end times for i in range(1, len(sorted_processes)): if sorted_processes[i]['arrival_time'] > end_time: # If there is a gap between processes, update the start time start_time = sorted_processes[i]['arrival_time'] else: # If the next process arrives before the current process finishes, # update the end time start_time = end_time end_time = start_time + sorted_processes[i]['burst_time'] # Add the process to the order list order.append((sorted_processes[i]['pid'], start_time, end_time)) return order ``` 时间片轮转调度算法(RR): ```python def rr(processes, quantum): """ Round-Robin (RR) scheduling algorithm Input: processes: a list of dictionaries containing process information Each dictionary should have the following keys: - 'pid': process ID - 'arrival_time': arrival time of the process - 'burst_time': burst time of the process quantum: the time quantum for the algorithm Output: a list of tuples containing the order in which the processes are executed Each tuple should have the following format: (process ID, start time, end time) """ # Sort the processes by arrival time sorted_processes = sorted(processes, key=lambda x: x['arrival_time']) # Initialize the start and end times of the first process start_time = sorted_processes[0]['arrival_time'] end_time = min(start_time + sorted_processes[0]['burst_time'], sorted_processes[1]['arrival_time']) if len(sorted_processes) > 1 else start_time + sorted_processes[0]['burst_time'] # Initialize the order list with the first process order = [(sorted_processes[0]['pid'], start_time, end_time)] # Initialize the queue with the remaining processes queue = sorted_processes[1:] # Loop through the queue until all processes are executed while queue: # Get the next process in the queue current_process = queue.pop(0) # If the process has not arrived yet, skip it if current_process['arrival_time'] > end_time: queue.append(current_process) continue # Calculate the remaining burst time for the current process remaining_time = current_process['burst_time'] start_time = end_time # Loop through the time slices until the process finishes while remaining_time > 0: # If the time slice is smaller than the remaining time, update the end time if remaining_time > quantum: end_time = start_time + quantum remaining_time -= quantum else: end_time = start_time + remaining_time remaining_time = 0 # Add the process to the order list order.append((current_process['pid'], start_time, end_time)) # Update the start time for the next time slice start_time = end_time # Check if there are any new processes that have arrived for process in queue: if process['arrival_time'] <= end_time: queue.remove(process) queue.append(current_process) current_process = process remaining_time = current_process['burst_time'] break return order ``` 优先级调度算法(抢占式): ```python def priority_preemptive(processes): """ Priority scheduling algorithm (preemptive) Input: processes: a list of dictionaries containing process information Each dictionary should have the following keys: - 'pid': process ID - 'arrival_time': arrival time of the process - 'burst_time': burst time of the process - 'priority': priority of the process (higher number = higher priority) Output: a list of tuples containing the order in which the processes are executed Each tuple should have the following format: (process ID, start time, end time) """ # Sort the processes by arrival time and priority sorted_processes = sorted(processes, key=lambda x: (x['arrival_time'], -x['priority'])) # Initialize the start and end times of the first process start_time = sorted_processes[0]['arrival_time'] end_time = start_time + sorted_processes[0]['burst_time'] # Initialize the order list with the first process order = [(sorted_processes[0]['pid'], start_time, end_time)] # Initialize the queue with the remaining processes queue = sorted_processes[1:] # Loop through the queue until all processes are executed while queue: # Get the highest-priority process in the queue current_process = max(queue, key=lambda x: x['priority']) # If the process has not arrived yet, skip it if current_process['arrival_time'] > end_time: queue.remove(current_process) continue # Calculate the remaining burst time for the current process remaining_time = current_process['burst_time'] start_time = end_time # Loop through the remaining processes to check if there is a higher-priority process for process in queue: if process['arrival_time'] <= end_time and process['priority'] > current_process['priority']: # If there is a higher-priority process, preempt the current process queue.remove(process) queue.append(current_process) current_process = process remaining_time = current_process['burst_time'] break # Loop through the time slices until the process finishes while remaining_time > 0: # If the next process has a higher priority, preempt the current process if queue and max(queue, key=lambda x: x['priority'])['priority'] > current_process['priority']: break # If the time slice is smaller than the remaining time, update the end time if remaining_time > 1: end_time += 1 remaining_time -= 1 else: end_time += 1 remaining_time = 0 # Add the process to the order list order.append((current_process['pid'], start_time, end_time)) return order ``` 高响应比优先调度算法: ```python def hrrn(processes): """ Highest-Response-Ratio-Next (HRRN) scheduling algorithm Input: processes: a list of dictionaries containing process information Each dictionary should have the following keys: - 'pid': process ID - 'arrival_time': arrival time of the process - 'burst_time': burst time of the process Output: a list of tuples containing the order in which the processes are executed Each tuple should have the following format: (process ID, start time, end time) """ # Sort the processes by arrival time sorted_processes = sorted(processes, key=lambda x: x['arrival_time']) # Initialize the start and end times of the first process start_time = sorted_processes[0]['arrival_time'] end_time = start_time + sorted_processes[0]['burst_time'] # Initialize the order list with the first process order = [(sorted_processes[0]['pid'], start_time, end_time)] # Initialize the queue with the remaining processes queue = sorted_processes[1:] # Loop through the queue until all processes are executed while queue: # Calculate the response ratio for each process in the queue response_ratios = [] for process in queue: wait_time = max(0, end_time - process['arrival_time']) response_ratio = (wait_time + process['burst_time']) / process['burst_time'] response_ratios.append(response_ratio) # Get the process with the highest response ratio index = response_ratios.index(max(response_ratios)) current_process = queue.pop(index) # Calculate the remaining burst time for the current process remaining_time = current_process['burst_time'] start_time = end_time # Loop through the time slices until the process finishes while remaining_time > 0: # If the next process has a higher response ratio, preempt the current process response_ratios = [] for process in queue: wait_time = max(0, end_time - process['arrival_time']) response_ratio = (wait_time + process['burst_time']) / process['burst_time'] response_ratios.append(response_ratio) if queue and max(response_ratios) > ((end_time - current_process['arrival_time']) / current_process['burst_time']): break # If the time slice is smaller than the remaining time, update the end time if remaining_time > 1: end_time += 1 remaining_time -= 1 else: end_time += 1 remaining_time = 0 # Add the process to the order list order.append((current_process['pid'], start_time, end_time)) return order ```

相关推荐

最新推荐

recommend-type

基于matlab实现V2G系统simulink仿真图以及电动汽车充电和放电图.rar

基于matlab实现V2G系统simulink仿真图以及电动汽车充电和放电图.rar
recommend-type

共创在线考试系统(JSP+SERVLET)130223.rar

共创在线考试系统(JSP+SERVLET)130223.rar,这是一个针对计算机专业学生的JSP源码资料包,旨在帮助学生更好地理解和掌握Java Web开发技术。该资料包包含了一个基于JSP和Servlet技术的在线考试系统,具有以下特点:功能齐全:该系统包括了在线考试、成绩查询、试题管理、用户管理等多个模块,能够满足学生进行在线考试的需求。界面友好:系统采用了简洁明了的界面设计,使得用户能够快速上手,方便地进行操作。代码规范:源码遵循Java编程规范,结构清晰,注释详细,便于学生学习和理解。可扩展性强:系统采用了模块化的设计思路,可以根据需要进行功能的扩展和修改。数据库支持:系统使用了MySQL数据库进行数据存储,可以方便地进行数据的增删改查操作。通过学习这个JSP源码资料包,学生可以掌握JSP和Servlet的基本用法,了解Java Web开发的基本流程,提高自己的编程能力。同时,该系统还可以作为学生课程设计或者毕业设计的参考项目,帮助他们完成学业任务。总之,这个共创在线考试系统(JSP+SERVLET)130223.rar资料包对于计算机专业的学生来说,是一个非常有价值的学习资
recommend-type

RTL8188FU-Linux-v5.7.4.2-36687.20200602.tar(20765).gz

REALTEK 8188FTV 8188eus 8188etv linux驱动程序稳定版本, 支持AP,STA 以及AP+STA 共存模式。 稳定支持linux4.0以上内核。
recommend-type

管理建模和仿真的文件

管理Boualem Benatallah引用此版本:布阿利姆·贝纳塔拉。管理建模和仿真。约瑟夫-傅立叶大学-格勒诺布尔第一大学,1996年。法语。NNT:电话:00345357HAL ID:电话:00345357https://theses.hal.science/tel-003453572008年12月9日提交HAL是一个多学科的开放存取档案馆,用于存放和传播科学研究论文,无论它们是否被公开。论文可以来自法国或国外的教学和研究机构,也可以来自公共或私人研究中心。L’archive ouverte pluridisciplinaire
recommend-type

:YOLOv1目标检测算法:实时目标检测的先驱,开启计算机视觉新篇章

![:YOLOv1目标检测算法:实时目标检测的先驱,开启计算机视觉新篇章](https://img-blog.csdnimg.cn/img_convert/69b98e1a619b1bb3c59cf98f4e397cd2.png) # 1. 目标检测算法概述 目标检测算法是一种计算机视觉技术,用于识别和定位图像或视频中的对象。它在各种应用中至关重要,例如自动驾驶、视频监控和医疗诊断。 目标检测算法通常分为两类:两阶段算法和单阶段算法。两阶段算法,如 R-CNN 和 Fast R-CNN,首先生成候选区域,然后对每个区域进行分类和边界框回归。单阶段算法,如 YOLO 和 SSD,一次性执行检
recommend-type

info-center source defatult

这是一个 Cisco IOS 命令,用于配置 Info Center 默认源。Info Center 是 Cisco 设备的日志记录和报告工具,可以用于收集和查看设备的事件、警报和错误信息。该命令用于配置 Info Center 默认源,即设备的默认日志记录和报告服务器。在命令行界面中输入该命令后,可以使用其他命令来配置默认源的 IP 地址、端口号和协议等参数。
recommend-type

c++校园超市商品信息管理系统课程设计说明书(含源代码) (2).pdf

校园超市商品信息管理系统课程设计旨在帮助学生深入理解程序设计的基础知识,同时锻炼他们的实际操作能力。通过设计和实现一个校园超市商品信息管理系统,学生掌握了如何利用计算机科学与技术知识解决实际问题的能力。在课程设计过程中,学生需要对超市商品和销售员的关系进行有效管理,使系统功能更全面、实用,从而提高用户体验和便利性。 学生在课程设计过程中展现了积极的学习态度和纪律,没有缺勤情况,演示过程流畅且作品具有很强的使用价值。设计报告完整详细,展现了对问题的深入思考和解决能力。在答辩环节中,学生能够自信地回答问题,展示出扎实的专业知识和逻辑思维能力。教师对学生的表现予以肯定,认为学生在课程设计中表现出色,值得称赞。 整个课程设计过程包括平时成绩、报告成绩和演示与答辩成绩三个部分,其中平时表现占比20%,报告成绩占比40%,演示与答辩成绩占比40%。通过这三个部分的综合评定,最终为学生总成绩提供参考。总评分以百分制计算,全面评估学生在课程设计中的各项表现,最终为学生提供综合评价和反馈意见。 通过校园超市商品信息管理系统课程设计,学生不仅提升了对程序设计基础知识的理解与应用能力,同时也增强了团队协作和沟通能力。这一过程旨在培养学生综合运用技术解决问题的能力,为其未来的专业发展打下坚实基础。学生在进行校园超市商品信息管理系统课程设计过程中,不仅获得了理论知识的提升,同时也锻炼了实践能力和创新思维,为其未来的职业发展奠定了坚实基础。 校园超市商品信息管理系统课程设计的目的在于促进学生对程序设计基础知识的深入理解与掌握,同时培养学生解决实际问题的能力。通过对系统功能和用户需求的全面考量,学生设计了一个实用、高效的校园超市商品信息管理系统,为用户提供了更便捷、更高效的管理和使用体验。 综上所述,校园超市商品信息管理系统课程设计是一项旨在提升学生综合能力和实践技能的重要教学活动。通过此次设计,学生不仅深化了对程序设计基础知识的理解,还培养了解决实际问题的能力和团队合作精神。这一过程将为学生未来的专业发展提供坚实基础,使其在实际工作中能够胜任更多挑战。
recommend-type

"互动学习:行动中的多样性与论文攻读经历"

多样性她- 事实上SCI NCES你的时间表ECOLEDO C Tora SC和NCESPOUR l’Ingén学习互动,互动学习以行动为中心的强化学习学会互动,互动学习,以行动为中心的强化学习计算机科学博士论文于2021年9月28日在Villeneuve d'Asq公开支持马修·瑟林评审团主席法布里斯·勒菲弗尔阿维尼翁大学教授论文指导奥利维尔·皮耶昆谷歌研究教授:智囊团论文联合主任菲利普·普雷教授,大学。里尔/CRISTAL/因里亚报告员奥利维耶·西格德索邦大学报告员卢多维奇·德诺耶教授,Facebook /索邦大学审查员越南圣迈IMT Atlantic高级讲师邀请弗洛里安·斯特鲁布博士,Deepmind对于那些及时看到自己错误的人...3谢谢你首先,我要感谢我的两位博士生导师Olivier和Philippe。奥利维尔,"站在巨人的肩膀上"这句话对你来说完全有意义了。从科学上讲,你知道在这篇论文的(许多)错误中,你是我可以依
recommend-type

:YOLO目标检测算法的挑战与机遇:数据质量、计算资源与算法优化,探索未来发展方向

![:YOLO目标检测算法的挑战与机遇:数据质量、计算资源与算法优化,探索未来发展方向](https://img-blog.csdnimg.cn/7e3d12895feb4651b9748135c91e0f1a.png?x-oss-process=image/watermark,type_ZHJvaWRzYW5zZmFsbGJhY2s,shadow_50,text_Q1NETiBA5rKJ6YaJ77yM5LqO6aOO5Lit,size_20,color_FFFFFF,t_70,g_se,x_16) # 1. YOLO目标检测算法简介 YOLO(You Only Look Once)是一种
recommend-type

tinyplay /storage/BFEF-19EE/wav.wav -D 0 cannot open device 0 for card 0 Unable to open PCM device 0.

这个错误信息可能是由于无法打开PCM设备0导致的。请检查以下几个方面,以便解决这个问题: 1. 你是否有足够的权限来访问该设备? 2. 检查一下PCM设备0是否已经被其他程序占用了。 3. 确认一下你的PCM设备是否已经被正确地配置和设置。 4. 检查一下你的系统是否有足够的内存和资源来支持你的PCM设备。 如果以上几个方面都检查过了,仍然无法解决问题,你可以尝试使用其他的设备号或者采用其他的操作系统来测试这个问题。