TAILIEUCHUNG - Lecture Operating systems: Lesson 17 - Dr. Syed Mansoor Sarwar

Lecture Operating systems: Lesson 17 - Dr. Syed Mansoor Sarwar. The main topics covered in this lesson include: multilevel queues and multilevel-feedback-queue scheduler, multi-level queues scheduling, multi-level feedback queues scheduling, UNIX System V scheduling, algorithm evaluation, . | Operating Systems Lecture 17 Syed Mansoor Sarwar Agenda for Today Review of previous lecture Multi-level queues scheduling Multi-level feedback queues scheduling UNIX System V scheduling Algorithm evaluation Recap of lecture 28 April 2022 Copyright Virtual University of Pakistan Review of Lecture 16 Shortest-Job-First is optimal Round-Robin scheduling Multi-level queues scheduling 28 April 2022 Copyright Virtual University of Pakistan Multilevel Queues 28 April 2022 Copyright Virtual University of Pakistan Multilevel Feedback Queues A process can move between the various queues aging can be implemented this way. Multilevel-feedback-queue scheduler defined by the following parameters Number of queues Scheduling algorithms for each queue 28 April 2022 Copyright Virtual University of Pakistan Multilevel Feedback Queues Method used to determine when to upgrade a process Method used to determine when to demote a process Method used to determine which queue a process will enter when that process needs service 28 April 2022 Copyright Virtual University of Pakistan Multilevel Feedback Queues 28 April 2022 Copyright Virtual University of Pakistan UNIX System V Scheduling Algorithm Multilevel feedback priority queues with round robin within each queue Quantum 1 second Priorities are divided into two groups bands Kernel Group User Group 28 April 2022 Copyright Virtual University of Pakistan UNIX System V Scheduling Algorithm Priorities in the Kernel Group are assigned in a manner to minimize bottlenecks processes waiting in a lower-level routine get higher priorities than those waiting at relatively higher-level routines. 28 April 2022 Copyright Virtual University of Pakistan UNIX System V Scheduling Algorithm In decreasing order of priority the bands are Swapper Block I O device control processes File manipulation Character I O device control processes User processes 28 April 2022 Copyright Virtual University of Pakistan UNIX System V Scheduling Algorithm Priorities of .

• Hệ điều hành
• Lecture Operating systems
• Bài giảng Hệ điều hành
• Operating systems
• Multilevel feedback queues
• Scheduling algorithms
• Algorithm evaluation
• Lecture Advanced Operating Systems
• Advanced Operating Systems
• Bài giảng Hệ điều hành nâng cao
• Server operating systems
• Multiprocessor operating systems
• PC operating systems
• Main frame operating systems
• Real time operating systems
• Structure of operating systems
• Distributed operating systems
• Memory management
• Embedded systems
• Modern operating systems
• Evolution of operating systems
• Memory protection
• File systems
• Characteristics of real time operating systems
• Real time scheduling
• Hệ điều hành
• Distributed systems
• Network operating systems
• Resource management
• User programs
• Computing environments
• Monolithic structure
• Implementing processes
• Process synchronization
• Scheduling policies
• Deadlock detection
• Handling deadlocks
• Message passing
• Implementing message passing
• Virtual memory
• Virtual memory manager
• File operations
• Distributed control algorithms
• Election algorithms
• Distributed system security
• Message security
• Networking essentials plus
• Lecture Networking essentials plus
• Novell operating systems
• Microsoft network operating systems
• Operating system
• Operating system concept
• Operating systems design
• Operating systems capabilities
• Network operating system
• Operating system structures
• Operating system design
• Operating system services
• Internalsand design principles
• Computer system
• Operating system objectives