Cpu scheduling in operating system pdf
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Ch5-CPU Scheduling.pdf

cpu scheduling in operating system pdf

OPERATING SYSTEMS PROCESSES. CPU Scheduling Policy The CPU scheduler makes a sequence of “moves” that determines the interleaving of threads. Programs use synchronization to prevent “bad moves”. …but otherwise scheduling choices appear (to the program) to be nondeterministic. The scheduler’s moves are dictated by a scheduling policy., Jun 14, 2015 · In a uni programming system like MS-DOS, time spent waiting for I/O is wasted and CPU is free during this time. In multi programming systems, one process can use CPU while another is waiting for I/O. This is possible only with process scheduling..

Scheduling (computing) Wikipedia

Process scheduling in operating system pdf. CPU Scheduling Scheduling refers to selecting a process, from many ready processes, that is to be next executed on CPU. In multiprogramming environment, multiple processes are kept in main memory. When one process has to wait for I/O completion, operating system takes the …, Scheduling refers to a set of policies and mechanisms to control the order of work to be performed by a computer system. Of all the resources in a computer system that are scheduled before use, the CPU is by far the most important. Multiprogramming is the (efficient) scheduling of the CPU. The basic idea is to keep the CPU busy as much.

– explain the structure and functions of an operating system, – illustrate key operating system aspects by concrete example, and – prepare you for future courses. . . • At the end of the course you should be able to: – compare and contrast CPU scheduling algorithms – explain the following: process, address space, file. Scheduling refers to a set of policies and mechanisms to control the order of work to be performed by a computer system. Of all the resources in a computer system that are scheduled before use, the CPU is by far the most important. Multiprogramming is the (efficient) scheduling of the CPU. The basic idea is to keep the CPU busy as much

The Process Scheduler schedule different processes to be assigned to the CPU based on particular scheduling algorithm. There are six popular process scheduling algorithms which we are going to discuss in the following section: First-Come, First-Served (FCFS) Scheduling Operating System Scheduling algorithms To introduce CPU scheduling, which is the basis for multiprogrammed operating systems To describe various CPU-scheduling algorithms To discuss evaluation criteria for selecting a CPU-scheduling algorithm for a particular system

the system Sleep will force a context switch. 31 Multiprocessor Scheduling RAM Process 1 Process 2 Process 3 Process 4 Process 1 Process 2 Process 3 Process 4 Symmetrical Scheduling (with per CPU queues) •Static partition of processes across CPUs 36 CPU 0 CPU 1 CPU 2 CPU 3 Advantages Easy to implement Scalable (no contention) Locality Whoops! There was a problem previewing Ch5-CPU Scheduling.pdf. Retrying.

CPU scheduling is a process which allows one process to use the CPU while the execution of another process is on hold(in waiting state) due to unavailability of any resource like I/O etc, thereby making full use of CPU. The aim of CPU scheduling is to make the system efficient, fast and fair. Whenever the CPU becomes idle, the operating system Scheduling Criteria • CPU utilization – keep the CPU as busy as possible • Throughput – # of processes that complete their execution per time unit • Turnaround time– amount of time to execute a particular process • Waiting time– amount of time a process has been waiting in the ready queue • Response time – amount of time it takes from when a

To introduce CPU scheduling, which is the basis for multiprogrammed operating systems To describe various CPU-scheduling algorithms To discuss evaluation criteria for selecting a CPU-scheduling algorithm for a particular system CPU Scheduling References: Abraham Silberschatz, Greg Gagne, and Peter Baer Galvin, "Operating System Concepts, Eighth Edition ", Chapter 5 5.1 Basic Concepts. Almost all programs have some alternating cycle of CPU number crunching and waiting for I/O of some kind. ( Even a simple fetch from memory takes a long time relative to CPU speeds.

Scheduling Criteria! Assumptions " One program per user and one thread per program " Programs are independent Goals for batch and interactive systems " Provide fairness " Everyone makes some progress; no one starves " Maximize CPU utilization • Not including idle process " Maximize throughput • Operations/second (min overhead, max resource utilization) CPU SCHEDULING is a key concept in computer multitasking, multiprocessing operating system and real‐time operating system designs. Scheduling refers to the way processes are assigned to run on the available CPUs, since there are typically many more processes running than there are available CPUs.

The Process Scheduler schedule different processes to be assigned to the CPU based on particular scheduling algorithm. There are six popular process scheduling algorithms which we are going to discuss in the following section: First-Come, First-Served (FCFS) Scheduling Operating System Scheduling algorithms When designing an operating system, a programmer must consider which scheduling algorithm will perform best for the use the system is going to see. There is no universal “best” scheduling algorithm, and many operating systems use extended or combinations of the scheduling algorithms above.

Process Scheduling and Operations in Operating System

cpu scheduling in operating system pdf

Chapter 6 CPU Scheduling. Whoops! There was a problem previewing Ch5-CPU Scheduling.pdf. Retrying., 5: CPU-Scheduling 4 CPU SCHEDULING Scheduling Concepts Multiprogramming A number of programs can be in memory at the same time. Allows overlap of CPU and I/O. Jobs (batch) are programs that run without user interaction. User (time shared) are programs that may have user interaction. Process is the common name for both..

Chapter 6 CPU Scheduling

cpu scheduling in operating system pdf

OPERATING SYSTEMS PROCESSES. ECE 344 Operating Systems Scheduling Criteria 2 • System-oriented – Effective and efficient utilization of CPU(s) – Throughput • Number of jobs executed per unit of … CPU Scheduling References: Abraham Silberschatz, Greg Gagne, and Peter Baer Galvin, "Operating System Concepts, Eighth Edition ", Chapter 5 5.1 Basic Concepts. Almost all programs have some alternating cycle of CPU number crunching and waiting for I/O of some kind. ( Even a simple fetch from memory takes a long time relative to CPU speeds..

cpu scheduling in operating system pdf


This paper proposes an intelligent operating system, KZ2, which is a new generation OS to manage the resources of massively parallel computing systems, to provide a … – explain the structure and functions of an operating system, – illustrate key operating system aspects by concrete example, and – prepare you for future courses. . . • At the end of the course you should be able to: – compare and contrast CPU scheduling algorithms – explain the following: process, address space, file.

Scheduling Criteria • CPU utilization – keep the CPU as busy as possible • Throughput – # of processes that complete their execution per time unit • Turnaround time– amount of time to execute a particular process • Waiting time– amount of time a process has been waiting in the ready queue • Response time – amount of time it takes from when a CPU Scheduling Algorithms-2 - Operating System Questions and Answers are very useful in all the kinds of competitive examinations from Clerk level to Officer level. These tests will assess the individuals computational capabilities which are useful in the day to day work in Banks, Insurance Companies, LIC AAO and other government offices.

Scheduling Criteria • CPU utilization – keep the CPU as busy as possible • Throughput – # of processes that complete their execution per time unit • Turnaround time– amount of time to execute a particular process • Waiting time– amount of time a process has been waiting in the ready queue • Response time – amount of time it takes from when a Recall Basics Algorithms Multi-Processor Scheduling Convoy effect P2, P3 and P4 could quickly finish their IO request ⇒ ready queue, waiting for CPU. Note: IO devices are idle then. then P1 finishes its CPU burst and move to an IO device. P2, P3, P4, which have short CPU bursts, finish quickly ⇒ back to IO queue.

Scheduling of the CPU is fundamental to operating system design Process execution consists of a cycle of a CPU time burst and an I/O time burst (i.e. wait) Processes alternate between these two states (i.e., CPU burst and I/O burst). Eventually, the final CPU burst ends with a system request to terminate execution Basic Concepts Otherwise, if the CPU burst of the currently running process is longer than 1-time quantum, the timer will go off and will cause an interrupt to the operating system. A context switch will be executed, and the process will be put at the tail oВЈ the ready queue. The CPU scheduler will then select the next process in the ready queue.

Operating Systems: Three Easy Pieces PDF. process scheduling in operating system pdf Retrieved.Operating System Principles. Selects from among the processes in memory that are ready to execute, and allocates the CPU to one of CPU Scheduling Algorithms-2 - Operating System Questions and Answers are very useful in all the kinds of competitive examinations from Clerk level to Officer level. These tests will assess the individuals computational capabilities which are useful in the day to day work in Banks, Insurance Companies, LIC AAO and other government offices.

Scheduling refers to a set of policies and mechanisms to control the order of work to be performed by a computer system. Of all the resources in a computer system that are scheduled before use, the CPU is by far the most important. Multiprogramming is the (efficient) scheduling of the CPU. The basic idea is to keep the CPU busy as much To introduce CPU scheduling, which is the basis for multiprogrammed operating systems To describe various CPU-scheduling algorithms To discuss evaluation criteria for selecting a CPU-scheduling algorithm for a particular system

cpu scheduling in operating system pdf

Operating System Concepts – 8th Edition 5.3 Silberschatz, Galvin and Gagne ©2009 Objectives To introduce CPU scheduling, which is the basis for multiprogrammed operating systems To describe various CPU-scheduling algorithms To discuss evaluation criteria for selecting a CPU-scheduling algorithm for a particular system It is difficult and time consuming to develop CPU scheduling algorithm and to understand its impact because of need to modify and test operating …

CPU Scheduling Operating System

cpu scheduling in operating system pdf

OOPPEERRAATTIINNGG SSYYSSTTEEMM. 5: CPU-Scheduling 4 CPU SCHEDULING Scheduling Concepts Multiprogramming A number of programs can be in memory at the same time. Allows overlap of CPU and I/O. Jobs (batch) are programs that run without user interaction. User (time shared) are programs that may have user interaction. Process is the common name for both., CPU Scheduling Scheduling refers to selecting a process, from many ready processes, that is to be next executed on CPU. In multiprogramming environment, multiple processes are kept in main memory. When one process has to wait for I/O completion, operating system takes the ….

COS 318 Operating Systems CPU Scheduling

CPU Scheduling in Operating System Studytonight. CPU Scheduling Benefits - Operating System Questions and Answers are very useful in all the kinds of competitive examinations from Clerk level to Officer level. These tests will assess the individuals computational capabilities which are useful in the day to day work in Banks, Insurance Companies, LIC AAO and other government offices., Jan 20, 2016В В· ШіЩ„Ш§Щ… Ш№Щ„ЩЉЩѓЩ… Щ€Ш±Ш­Щ…Ш© Ш§Щ„Щ„Щ‡ .. Ш±Ш§Ш­ Ш§Щ†ШІЩ„ ШіЩ„ШіЩ„Ш© ШЇШ±Щ€Ші ШґШ±Ш­ Щ„Щ†ШёЩ… Ш§Щ„ШЄШґШєЩЉЩ„ . Ш§Щ„Щ…Щ‚Ш·Ш№ Щ‡Ш°Ш§ ЩЉШ­ШЄЩ€ЩЉ Ш№Щ„Щ‰ Ш¬Щ…ЩЉШ№ Ш§Щ„ШєЩ€Ш±ЩЉШ«Щ… Ш§Щ„ШґШ±Ш­.

– explain the structure and functions of an operating system, – illustrate key operating system aspects by concrete example, and – prepare you for future courses. . . • At the end of the course you should be able to: – compare and contrast CPU scheduling algorithms – explain the following: process, address space, file. Scheduling of the CPU is fundamental to operating system design Process execution consists of a cycle of a CPU time burst and an I/O time burst (i.e. wait) Processes alternate between these two states (i.e., CPU burst and I/O burst). Eventually, the final CPU burst ends with a system request to terminate execution Basic Concepts

Scheduling of the CPU is fundamental to operating system design Process execution consists of a cycle of a CPU time burst and an I/O time burst (i.e. wait) Processes alternate between these two states (i.e., CPU burst and I/O burst). Eventually, the final CPU burst ends with a system request to terminate execution Basic Concepts 3: Processes 6 The act of Scheduling a process means changing the active PCB pointed to by the CPU. Also called a context switch. A context switch is essentially the same as a process switch - it means that the memory, as seen by one process …

the system Sleep will force a context switch. 31 Multiprocessor Scheduling RAM Process 1 Process 2 Process 3 Process 4 Process 1 Process 2 Process 3 Process 4 Symmetrical Scheduling (with per CPU queues) •Static partition of processes across CPUs 36 CPU 0 CPU 1 CPU 2 CPU 3 Advantages Easy to implement Scalable (no contention) Locality – explain the structure and functions of an operating system, – illustrate key operating system aspects by concrete example, and – prepare you for future courses. . . • At the end of the course you should be able to: – compare and contrast CPU scheduling algorithms – explain the following: process, address space, file.

3: Processes 6 The act of Scheduling a process means changing the active PCB pointed to by the CPU. Also called a context switch. A context switch is essentially the same as a process switch - it means that the memory, as seen by one process … Due of the importance of the decisions taken by the long-term scheduler, if it is not well implemented it would seriously affect the system's performance (CPU under usage or process overload). Consider two CPU scheduling algorithms for a single CPU: Round-Robin scheduling and (non-preemptive) Shortest-Job-First scheduling.

Jan 20, 2016 · سلام عليكم ورحمة الله .. راح انزل سلسلة دروس شرح لنظم التشغيل . المقطع هذا يحتوي على جميع الغوريثم الشرح CPU SCHEDULING is a key concept in computer multitasking, multiprocessing operating system and real‐time operating system designs. Scheduling refers to the way processes are assigned to run on the available CPUs, since there are typically many more processes running than there are available CPUs.

CPU Scheduling References: Abraham Silberschatz, Greg Gagne, and Peter Baer Galvin, "Operating System Concepts, Eighth Edition ", Chapter 5 5.1 Basic Concepts. Almost all programs have some alternating cycle of CPU number crunching and waiting for I/O of some kind. ( Even a simple fetch from memory takes a long time relative to CPU speeds. 5: CPU-Scheduling 4 CPU SCHEDULING Scheduling Concepts Multiprogramming A number of programs can be in memory at the same time. Allows overlap of CPU and I/O. Jobs (batch) are programs that run without user interaction. User (time shared) are programs that may have user interaction. Process is the common name for both.

Operating System Concepts –9thEdition 6.3 Silberschatz, Galvin and Gagne ©2013 Objectives To introduce CPU scheduling, which is the basis for multiprogrammed operating systems To describe various CPU-scheduling algorithms To discuss evaluation criteria for selecting a CPU-scheduling algorithm for a particular system Operating System Concepts –9thEdition 6.3 Silberschatz, Galvin and Gagne ©2013 Objectives To introduce CPU scheduling, which is the basis for multiprogrammed operating systems To describe various CPU-scheduling algorithms To discuss evaluation criteria for selecting a CPU-scheduling algorithm for a particular system

What is Process Scheduling? The act of determining which process is in the ready state, and should be moved to the running state is known as Process Scheduling.. The prime aim of the process scheduling system is to keep the CPU busy all the time and to deliver minimum response time for all programs. The Round Robin and FIFO scheduling algorithms are used to switch between real-time processes. Windows is by far the most popular proprietary personal computer operating system, while Linux is the most prominent free software operating system.

CPU scheduling is a process which allows one process to use the CPU while the execution of another process is on hold(in waiting state) due to unavailability of any resource like I/O etc, thereby making full use of CPU. The aim of CPU scheduling is to make the system efficient, fast and fair. Whenever the CPU becomes idle, the operating system Whoops! There was a problem previewing Ch5-CPU Scheduling.pdf. Retrying.

5: CPU-Scheduling 4 CPU SCHEDULING Scheduling Concepts Multiprogramming A number of programs can be in memory at the same time. Allows overlap of CPU and I/O. Jobs (batch) are programs that run without user interaction. User (time shared) are programs that may have user interaction. Process is the common name for both. CPU Scheduling Scheduling refers to selecting a process, from many ready processes, that is to be next executed on CPU. In multiprogramming environment, multiple processes are kept in main memory. When one process has to wait for I/O completion, operating system takes the …

When designing an operating system, a programmer must consider which scheduling algorithm will perform best for the use the system is going to see. There is no universal “best” scheduling algorithm, and many operating systems use extended or combinations of the scheduling algorithms above. CPU Scheduling Algorithms-2 - Operating System Questions and Answers are very useful in all the kinds of competitive examinations from Clerk level to Officer level. These tests will assess the individuals computational capabilities which are useful in the day to day work in Banks, Insurance Companies, LIC AAO and other government offices.

CPU Scheduling - Operating System Multiple Choice Questions and Answers This is the questions and answers section on "Operating Systems CPU Scheduling" with the explanation for various interview, competitive examination and entrance test. 2 MULTIPROCESSOR SCHEDULING (ADVANCED) Memory CPU Cache Figure 10.1: Single CPU With Cache Beyond applications, a new problem that arises for the operating sys-tem is (not surprisingly!) that of multiprocessor scheduling.Thus far we’ve discussed a number of principles behind single-processor schedul-

– explain the structure and functions of an operating system, – illustrate key operating system aspects by concrete example, and – prepare you for future courses. . . • At the end of the course you should be able to: – compare and contrast CPU scheduling algorithms – explain the following: process, address space, file. CPU Scheduling Algorithms-2 - Operating System Questions and Answers are very useful in all the kinds of competitive examinations from Clerk level to Officer level. These tests will assess the individuals computational capabilities which are useful in the day to day work in Banks, Insurance Companies, LIC AAO and other government offices.

Operating System Concepts –9th Edition 6.2 Silberschatz, Galvin and Gagne ©2013 Priority Scheduling A priority number (integer) is associated with each process The CPU is allocated to the process with the highest priority (smallest integer highest priority) Can be preemptive Can be nonpreemptive SJF is priority scheduling where priority is the inverse of predicted Scheduling Criteria • CPU utilization – keep the CPU as busy as possible • Throughput – # of processes that complete their execution per time unit • Turnaround time– amount of time to execute a particular process • Waiting time– amount of time a process has been waiting in the ready queue • Response time – amount of time it takes from when a

Operating System Concepts –9th Edition 6.2 Silberschatz, Galvin and Gagne ©2013 Priority Scheduling A priority number (integer) is associated with each process The CPU is allocated to the process with the highest priority (smallest integer highest priority) Can be preemptive Can be nonpreemptive SJF is priority scheduling where priority is the inverse of predicted the system Sleep will force a context switch. 31 Multiprocessor Scheduling RAM Process 1 Process 2 Process 3 Process 4 Process 1 Process 2 Process 3 Process 4 Symmetrical Scheduling (with per CPU queues) •Static partition of processes across CPUs 36 CPU 0 CPU 1 CPU 2 CPU 3 Advantages Easy to implement Scalable (no contention) Locality

CPU Scheduling Algorithms-2 Operating System Questions. Whoops! There was a problem previewing Ch5-CPU Scheduling.pdf. Retrying., What is Process Scheduling? The act of determining which process is in the ready state, and should be moved to the running state is known as Process Scheduling.. The prime aim of the process scheduling system is to keep the CPU busy all the time and to deliver minimum response time for all programs..

CPU Scheduling Benefits Operating System Questions and

cpu scheduling in operating system pdf

www2.latech.edu. The Round Robin and FIFO scheduling algorithms are used to switch between real-time processes. Windows is by far the most popular proprietary personal computer operating system, while Linux is the most prominent free software operating system., When designing an operating system, a programmer must consider which scheduling algorithm will perform best for the use the system is going to see. There is no universal “best” scheduling algorithm, and many operating systems use extended or combinations of the scheduling algorithms above..

cpu scheduling in operating system pdf

CPU Scheduling Algorithms in Operating System. Operating Systems: Three Easy Pieces PDF. process scheduling in operating system pdf Retrieved.Operating System Principles. Selects from among the processes in memory that are ready to execute, and allocates the CPU to one of, the system Sleep will force a context switch. 31 Multiprocessor Scheduling RAM Process 1 Process 2 Process 3 Process 4 Process 1 Process 2 Process 3 Process 4 Symmetrical Scheduling (with per CPU queues) •Static partition of processes across CPUs 36 CPU 0 CPU 1 CPU 2 CPU 3 Advantages Easy to implement Scalable (no contention) Locality.

Multiprocessor Scheduling (Advanced)

cpu scheduling in operating system pdf

Process Scheduling and Operations in Operating System. CPU scheduling is a process which allows one process to use the CPU while the execution of another process is on hold(in waiting state) due to unavailability of any resource like I/O etc, thereby making full use of CPU. The aim of CPU scheduling is to make the system efficient, fast and fair. Whenever the CPU becomes idle, the operating system CPU Scheduling Benefits - Operating System Questions and Answers are very useful in all the kinds of competitive examinations from Clerk level to Officer level. These tests will assess the individuals computational capabilities which are useful in the day to day work in Banks, Insurance Companies, LIC AAO and other government offices..

cpu scheduling in operating system pdf

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  • 3: Processes 6 The act of Scheduling a process means changing the active PCB pointed to by the CPU. Also called a context switch. A context switch is essentially the same as a process switch - it means that the memory, as seen by one process … Operating System Concepts 6.5 Silberschatz, Galvin and Gagne 2002 CPU Scheduler Selects from among the processes in memory that are ready to execute, and allocates the CPU to one of them. CPU scheduling decisions may take place when a process: 1. …

    Whoops! There was a problem previewing Ch5-CPU Scheduling.pdf. Retrying. Operating System Concepts 6.5 Silberschatz, Galvin and Gagne 2002 CPU Scheduler Selects from among the processes in memory that are ready to execute, and allocates the CPU to one of them. CPU scheduling decisions may take place when a process: 1. …

    Operating System Concepts –9th Edition 6.7 Silberschatz, Galvin and Gagne ©2013 CPU Scheduler Short-term scheduler selects from among the processes in ready queue and allocates the CPU to one of them Queue may be ordered in various ways: FIFO, LIFO, Random, Priority, … etc CPU scheduling decisions may take place when a process: 1. This paper proposes an intelligent operating system, KZ2, which is a new generation OS to manage the resources of massively parallel computing systems, to provide a …

    What is Process Scheduling? The act of determining which process is in the ready state, and should be moved to the running state is known as Process Scheduling.. The prime aim of the process scheduling system is to keep the CPU busy all the time and to deliver minimum response time for all programs. When designing an operating system, a programmer must consider which scheduling algorithm will perform best for the use the system is going to see. There is no universal “best” scheduling algorithm, and many operating systems use extended or combinations of the scheduling algorithms above.

    Operating System Concepts –9th Edition 6.2 Silberschatz, Galvin and Gagne ©2013 Priority Scheduling A priority number (integer) is associated with each process The CPU is allocated to the process with the highest priority (smallest integer highest priority) Can be preemptive Can be nonpreemptive SJF is priority scheduling where priority is the inverse of predicted a fully-operational scheduling discipline1. We will make the following assumptions about the processes, some-times called jobs, that are running in the system: 1. Each job runs for the same amount of time. 2. All jobs arrive at the same time. 3. Once started, each job runs to completion. 4. All jobs only use the CPU (i.e., they perform no I/O) 5.

    the system Sleep will force a context switch. 31 Multiprocessor Scheduling RAM Process 1 Process 2 Process 3 Process 4 Process 1 Process 2 Process 3 Process 4 Symmetrical Scheduling (with per CPU queues) •Static partition of processes across CPUs 36 CPU 0 CPU 1 CPU 2 CPU 3 Advantages Easy to implement Scalable (no contention) Locality To introduce CPU scheduling, which is the basis for multiprogrammed operating systems To describe various CPU-scheduling algorithms To discuss evaluation criteria for selecting a CPU-scheduling algorithm for a particular system

    CPU Scheduling Scheduling refers to selecting a process, from many ready processes, that is to be next executed on CPU. In multiprogramming environment, multiple processes are kept in main memory. When one process has to wait for I/O completion, operating system takes the … CPU Scheduling Benefits - Operating System Questions and Answers are very useful in all the kinds of competitive examinations from Clerk level to Officer level. These tests will assess the individuals computational capabilities which are useful in the day to day work in Banks, Insurance Companies, LIC AAO and other government offices.

    Operating System Concepts 6.5 Silberschatz, Galvin and Gagne 2002 CPU Scheduler Selects from among the processes in memory that are ready to execute, and allocates the CPU to one of them. CPU scheduling decisions may take place when a process: 1. … CPU, memory, I/O devices Operating system Controls and coordinates use of hardware among various applications and users Application programs – define the ways in which the system resources are used to solve the computing problems of the users Word processors, compilers, web browsers, database systems, video games Users People, machines, other

    CPU Scheduling References: Abraham Silberschatz, Greg Gagne, and Peter Baer Galvin, "Operating System Concepts, Eighth Edition ", Chapter 5 5.1 Basic Concepts. Almost all programs have some alternating cycle of CPU number crunching and waiting for I/O of some kind. ( Even a simple fetch from memory takes a long time relative to CPU speeds. CPU Scheduling References: Abraham Silberschatz, Greg Gagne, and Peter Baer Galvin, "Operating System Concepts, Eighth Edition ", Chapter 5 5.1 Basic Concepts. Almost all programs have some alternating cycle of CPU number crunching and waiting for I/O of some kind. ( Even a simple fetch from memory takes a long time relative to CPU speeds.

    CPU Scheduling References: Abraham Silberschatz, Greg Gagne, and Peter Baer Galvin, "Operating System Concepts, Eighth Edition ", Chapter 5 5.1 Basic Concepts. Almost all programs have some alternating cycle of CPU number crunching and waiting for I/O of some kind. ( Even a simple fetch from memory takes a long time relative to CPU speeds. Scheduling Criteria • CPU utilization – keep the CPU as busy as possible • Throughput – # of processes that complete their execution per time unit • Turnaround time– amount of time to execute a particular process • Waiting time– amount of time a process has been waiting in the ready queue • Response time – amount of time it takes from when a

    Scheduling of the CPU is fundamental to operating system design Process execution consists of a cycle of a CPU time burst and an I/O time burst (i.e. wait) Processes alternate between these two states (i.e., CPU burst and I/O burst). Eventually, the final CPU burst ends with a system request to terminate execution Basic Concepts Whoops! There was a problem previewing Ch5-CPU Scheduling.pdf. Retrying.

    Scheduling Criteria! Assumptions " One program per user and one thread per program " Programs are independent Goals for batch and interactive systems " Provide fairness " Everyone makes some progress; no one starves " Maximize CPU utilization • Not including idle process " Maximize throughput • Operations/second (min overhead, max resource utilization) Scheduling refers to a set of policies and mechanisms to control the order of work to be performed by a computer system. Of all the resources in a computer system that are scheduled before use, the CPU is by far the most important. Multiprogramming is the (efficient) scheduling of the CPU. The basic idea is to keep the CPU busy as much

    CPU Scheduling Scheduling refers to selecting a process, from many ready processes, that is to be next executed on CPU. In multiprogramming environment, multiple processes are kept in main memory. When one process has to wait for I/O completion, operating system takes the … the system Sleep will force a context switch. 31 Multiprocessor Scheduling RAM Process 1 Process 2 Process 3 Process 4 Process 1 Process 2 Process 3 Process 4 Symmetrical Scheduling (with per CPU queues) •Static partition of processes across CPUs 36 CPU 0 CPU 1 CPU 2 CPU 3 Advantages Easy to implement Scalable (no contention) Locality

    cpu scheduling in operating system pdf

    2 MULTIPROCESSOR SCHEDULING (ADVANCED) Memory CPU Cache Figure 10.1: Single CPU With Cache Beyond applications, a new problem that arises for the operating sys-tem is (not surprisingly!) that of multiprocessor scheduling.Thus far we’ve discussed a number of principles behind single-processor schedul- CPU Scheduling References: Abraham Silberschatz, Greg Gagne, and Peter Baer Galvin, "Operating System Concepts, Eighth Edition ", Chapter 5 5.1 Basic Concepts. Almost all programs have some alternating cycle of CPU number crunching and waiting for I/O of some kind. ( Even a simple fetch from memory takes a long time relative to CPU speeds.

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