Cpu scheduling(suresh)
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The document discusses various concepts related to CPU scheduling in operating systems, including: 1) CPU scheduling aims to maximize CPU utilization by allowing other processes to run when one process is waiting for I/O. Short-term schedulers select ready processes from memory to run on the CPU. 2) Scheduling can be preemptive or nonpreemptive depending on when context switches occur. Dispatchers are responsible for context switches between processes. 3) Common scheduling criteria include CPU utilization, throughput, turnaround time, waiting time, and response time. 4) Scheduling algorithms like FCFS, SJF, priority, round robin, and multilevel queue scheduling aim to optimize
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cpu sechduling
This document summarizes key concepts in CPU scheduling, including:
1) CPU scheduling algorithms like FCFS, SJF, priority, and round robin and how they optimize different criteria.
2) The role of dispatchers in context switching between processes.
3) Scheduling criteria like CPU utilization, throughput, turnaround time.
4) Advanced scheduling techniques like multilevel queues, multilevel feedback queues, and multiprocessor scheduling.
Process management in os
1. Process management is an integral part of operating systems for allocating resources, enabling information sharing, and protecting processes. The OS maintains data structures describing each process's state and resource ownership.
2. Processes go through discrete states and events can cause state changes. Scheduling selects processes to run from ready, device, and job queues using algorithms like round robin, shortest job first, and priority scheduling.
3. CPU scheduling aims to maximize utilization and throughput while minimizing waiting times using criteria like response time, turnaround time, and fairness between processes.
Preemptive process example.pptx
The document discusses process scheduling in operating systems. It covers basic concepts like scheduling criteria, algorithms like FCFS, SJF, priority and round robin scheduling. It explains key process states and scheduling techniques like preemptive and non-preemptive. Examples are provided to illustrate different scheduling algorithms and how they optimize criteria like waiting time, response time and CPU utilization.
Ch6
CPU scheduling involves selecting which process to execute next from among processes in memory. There are several criteria for evaluating CPU scheduling algorithms, including CPU utilization, throughput, turnaround time, waiting time, and response time. Common algorithms include first-come, first-served (FCFS), shortest-job-first (SJF), priority scheduling, and round robin (RR). Multilevel queue and feedback queue scheduling involve partitioning processes into multiple queues that use different scheduling policies.
Ch5
This document discusses various CPU scheduling algorithms and concepts. It covers scheduling criteria like CPU utilization and turnaround time. Algorithms discussed include first-come first-served (FCFS), shortest job first (SJF), priority scheduling, and round robin (RR). It also covers multiple queue scheduling, real-time scheduling, and ways to evaluate scheduling algorithm performance like deterministic modeling and simulation.
Scheduling algorithm (chammu)
The document discusses several topics related to CPU scheduling, including basic concepts, scheduling criteria, algorithms like first-come first-served (FCFS) and shortest-job-first (SJF), determining CPU burst lengths, priority scheduling, and approaches to scheduling on multiple processors. Key concepts are that the CPU scheduler selects ready processes to run and aims to maximize CPU utilization while minimizing waiting times using algorithms like FCFS, SJF, priority, and round robin scheduling. Load sharing and affinity are considerations for multiprocessor scheduling.
OS_Ch6
This document discusses various CPU scheduling algorithms and concepts. It covers scheduling criteria like CPU utilization and turnaround time. Algorithms discussed include first-come first-served (FCFS), shortest job first (SJF), priority scheduling, and round robin (RR). It also covers multiple processor scheduling, real-time scheduling, and evaluating scheduling algorithms.
Process Scheduling Algorithms.pdf
The document discusses operating system scheduling. It defines key scheduling criteria like CPU utilization, throughput, turnaround time, waiting time, and response time. It also outlines common scheduling algorithms like first-come first-served (FCFS), shortest-job-next (SJN), priority scheduling, shortest remaining time, and round robin. For each algorithm, it provides examples of how they work and how to calculate metrics like waiting time and turnaround time. It also distinguishes between time-sharing systems, which context switch between processes frequently for fast response, and parallel processing systems, which divide programs across multiple processors.
Os..
The document discusses various scheduling algorithms used in operating systems including:
- First Come First Serve (FCFS) scheduling which services processes in the order they arrive but can lead to long wait times.
- Shortest Job First (SJF) scheduling which prioritizes the shortest processes first to minimize wait times. This can be preemptive or non-preemptive.
- Priority scheduling which assigns priorities to processes and services the highest priority first, which can cause starvation of low priority processes.
- Round Robin scheduling which allows fair sharing of the CPU by allocating a time quantum or slice to each process in a cyclic manner.
Csc4320 chapter 5 2
The document discusses various scheduling algorithms used in operating systems including:
- First Come First Serve (FCFS) scheduling which services processes in the order of arrival but can lead to long waiting times.
- Shortest Job First (SJF) scheduling which prioritizes the shortest processes first to minimize waiting times. It can be preemptive or non-preemptive.
- Priority scheduling assigns priorities to processes and services the highest priority process first, which can potentially cause starvation of low priority processes.
- Round Robin scheduling allows equal CPU access to all processes by allowing each a small time quantum before being preempted. It has lower average waiting times than FCFS but higher than SJF.
Scheduling algorithms
The document discusses various scheduling algorithms used in operating systems including:
- First Come First Serve (FCFS) scheduling which services processes in the order of arrival but can lead to long waiting times.
- Shortest Job First (SJF) scheduling which prioritizes the shortest processes first to minimize waiting times. It can be preemptive or non-preemptive.
- Priority scheduling assigns priorities to processes and services the highest priority process first, which can potentially cause starvation of low priority processes.
- Round Robin scheduling allows equal CPU access to all processes by allowing each a small time quantum or slice before preempting to the next process.
Operating System Scheduling
The document discusses processes and process scheduling in operating systems. It defines a process as a program in execution that contains a program counter, stack, and data section. Processes can be in various states like new, ready, running, waiting, and terminated. A process control block contains information about each process like its state, program counter, memory allocation, and more. Scheduling aims to optimize CPU utilization, throughput, turnaround time, waiting time, and response time using algorithms like first come first serve, shortest job first, priority, and round robin scheduling.
csc4320chapter5-2-101203002830-phpapp01.pdf
The document discusses various scheduling algorithms used in operating systems. It describes scheduling criteria like CPU utilization, throughput, turnaround time, waiting time and response time that scheduling aims to optimize. It then explains different scheduling algorithms like First Come First Serve (FCFS), Shortest Job First (SJF), Priority Scheduling, Round Robin, Multilevel Queue Scheduling and Multilevel Feedback Queue Scheduling. For each algorithm, it provides examples to illustrate how they work and their performance characteristics.
CH06.pdf
This document discusses CPU scheduling in operating systems. It begins by introducing CPU scheduling and describing the goals of scheduling algorithms. It then explains common scheduling algorithms like first-come first-served (FCFS), shortest job first (SJF), priority scheduling, and round robin (RR). The document also covers multilevel queue scheduling, thread scheduling, multiple processor scheduling, and real-time CPU scheduling.
Operating Systems Third Unit - Fourth Semester - Engineering
The document describes CPU scheduling concepts in a multiprogramming operating system. It discusses how CPU scheduling depends on CPU bursts and I/O waits as processes alternate between the two states. The scheduler selects processes from the ready queue to run on the CPU. Scheduling can be preemptive, occurring when a process changes states, or non-preemptive. Common scheduling algorithms like first-come, first-served, shortest job first, priority, and round robin are described. Optimization criteria for scheduling like CPU utilization, throughput, turnaround time and waiting time are also covered.
Cpu_sheduling.pptx
This document provides an overview of CPU scheduling concepts and algorithms. It discusses the objectives of CPU scheduling, basic concepts like process bursts and context switching. It then covers various scheduling algorithms like FCFS, SJF, priority scheduling and round robin. It also discusses criteria for evaluating scheduling algorithms and threading concepts. Finally, it summarizes multiple processor scheduling and operating system examples of scheduling.
Operating system 29 non preemptive scheduling
This document discusses various non-preemptive scheduling algorithms, including first-come, first-served (FCFS) scheduling where processes are executed in the order of arrival. It also covers shortest-job-first (SJF) scheduling where the process with the shortest predicted CPU burst time is scheduled next. Finally, it describes priority scheduling where processes are executed based on assigned priorities, with the highest priority process being scheduled next.
Cpu scheduling
This document provides an outline of topics related to CPU scheduling in operating systems. It discusses basic concepts like CPU-I/O burst cycles, scheduling criteria, and various scheduling algorithms including first-come first-served, shortest job first, priority, round robin, and multilevel queue scheduling. It also covers thread scheduling, multiple processor scheduling, real-time scheduling, and approaches to evaluating scheduling algorithms.
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Operating Systems Third Unit - Fourth Semester - Engineering
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Cpu scheduling(suresh)
- 20. NUMA and CPU Scheduling
- 21. Thank you