Operating Systems Cheat Sheet by makahoshi1
... 3)interactive editing processes 4)batch processes 5)student processes Each queue also has it's own scheduling alogorithm, so System processes could use FCFS while student processes use RR. Each queue has absolute priority over lower priority queues, but it is possible to time-slice among queues so ...
... 3)interactive editing processes 4)batch processes 5)student processes Each queue also has it's own scheduling alogorithm, so System processes could use FCFS while student processes use RR. Each queue has absolute priority over lower priority queues, but it is possible to time-slice among queues so ...
Lecture 1 - Operating System Overview
... Files usually organized into directories Access control on most systems to determine who can access what OS activities include Creating and deleting files and directories Primitives to manipulate files and dirs ...
... Files usually organized into directories Access control on most systems to determine who can access what OS activities include Creating and deleting files and directories Primitives to manipulate files and dirs ...
hw1_wet
... below. You should use VMware to simulate a virtual machine on which you compile and run your "modified" Linux. ...
... below. You should use VMware to simulate a virtual machine on which you compile and run your "modified" Linux. ...
Module 3: Operating
... operating-systems research and development. System development is done on the virtual machine, instead of on a physical machine and so does not disrupt normal system operation The virtual machine concept is difficult to implement due to the effort required to provide an exact duplicate to the ...
... operating-systems research and development. System development is done on the virtual machine, instead of on a physical machine and so does not disrupt normal system operation The virtual machine concept is difficult to implement due to the effort required to provide an exact duplicate to the ...
Best-Effort Multimedia Networking Outline
... (e.g., page tables) set the mode bits that determine user or kernel mode disable and enable interrupts halt the machine but in kernel mode, the OS does all these things a status bit in a protected processor register indicates the mode Protected instructions can only be executed in kernel mode. On in ...
... (e.g., page tables) set the mode bits that determine user or kernel mode disable and enable interrupts halt the machine but in kernel mode, the OS does all these things a status bit in a protected processor register indicates the mode Protected instructions can only be executed in kernel mode. On in ...
Operating Systems History
... have the function to coordinate to the other parts of an OS such as : I/O Devices, Process, Memory and File Systems. • The structure of and OS could be different but in most of the time are very similar because some OS use Open Standards. ...
... have the function to coordinate to the other parts of an OS such as : I/O Devices, Process, Memory and File Systems. • The structure of and OS could be different but in most of the time are very similar because some OS use Open Standards. ...
Lecture 15
... Medium term scheduler (swapper): determine which process to swap in/out of disk to/from memory. Long term scheduler: Determine which processes are admitted into the system. Schedulers determine which processes will wait and which will progress. Schedulers affect the performance of the system. Schedu ...
... Medium term scheduler (swapper): determine which process to swap in/out of disk to/from memory. Long term scheduler: Determine which processes are admitted into the system. Schedulers determine which processes will wait and which will progress. Schedulers affect the performance of the system. Schedu ...
Operating System
... The kernel is the core of the UNIX operating system. UNIX uses microkernel approach, where code from the kernel is moved up in higher layers to keep it as small (thin) as possible. Kernel is a program, which is loaded in memory when system is turned on. It stays there and provides various s ...
... The kernel is the core of the UNIX operating system. UNIX uses microkernel approach, where code from the kernel is moved up in higher layers to keep it as small (thin) as possible. Kernel is a program, which is loaded in memory when system is turned on. It stays there and provides various s ...
Message- passing and RPC Processes Processes vs. Threads
... simple representation — each thread is represented simply by a PC, registers, stack, and a small control block, all stored in the user process’ address space ...
... simple representation — each thread is represented simply by a PC, registers, stack, and a small control block, all stored in the user process’ address space ...
system call
... In order to fulfil function 2, for each type of resource, the OS needs to share the use of the resource between the different programs that want to use it. To do this fairly between the different programs it must allocate resources to a program i.e. give it the right to use a resource and then sched ...
... In order to fulfil function 2, for each type of resource, the OS needs to share the use of the resource between the different programs that want to use it. To do this fairly between the different programs it must allocate resources to a program i.e. give it the right to use a resource and then sched ...
Distributed Operating Systems
... the first process Pj, where j is searched in order [ i+1, i+2, ..., n, 1, 2, ..., i-2, i1] for which there is a pending request. If no process is waiting, Pi retains the token (and is allowed to enter the CS if it needs); it will pass over the token as result of an incoming request. ...
... the first process Pj, where j is searched in order [ i+1, i+2, ..., n, 1, 2, ..., i-2, i1] for which there is a pending request. If no process is waiting, Pi retains the token (and is allowed to enter the CS if it needs); it will pass over the token as result of an incoming request. ...
ppt
... • Instead, delay the movement of threads among queues until the queues are queried. • Why? – A sending thread that blocks will soon unblock again, and maybe nobody will ever notice that it blocked ...
... • Instead, delay the movement of threads among queues until the queues are queried. • Why? – A sending thread that blocks will soon unblock again, and maybe nobody will ever notice that it blocked ...
Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights... McGraw-Hill Technology Education
... • User interface – How a user interacts with a computer – Require different skill sets ...
... • User interface – How a user interacts with a computer – Require different skill sets ...
Lecture 5
... I/O operations – since user programs cannot execute I/O operations directly, the operating system must provide some means to perform I/O. File-system manipulation – program capability to read, write, create, and delete files. Communications – exchange of information between processes executing eithe ...
... I/O operations – since user programs cannot execute I/O operations directly, the operating system must provide some means to perform I/O. File-system manipulation – program capability to read, write, create, and delete files. Communications – exchange of information between processes executing eithe ...
Example Sheet for Operating Systems I (Part IA)
... (b) A Unix system administrator decides to make a ‘versioned’ file-system in which there are a number of directories called /root-dd-mm-yyyy, each of which holds a copy of the file-system on day dd, month mm and year yyyy. The idea is that at any particular time only the most recent snapshot will be ...
... (b) A Unix system administrator decides to make a ‘versioned’ file-system in which there are a number of directories called /root-dd-mm-yyyy, each of which holds a copy of the file-system on day dd, month mm and year yyyy. The idea is that at any particular time only the most recent snapshot will be ...
Week 2 _Operating system File
... When user program fails the entire system crashes UNIX is another system that initially was limited by hardware functionality. ...
... When user program fails the entire system crashes UNIX is another system that initially was limited by hardware functionality. ...
Syllabus
... - A time-shared OS allows the many users to simultaneously share the computer. - Multiple jobs are executed by the CPU switching between them executes multiple jobs; so that, the user may interact with his program while it is running. - A time-shared OS uses CPU scheduling and multiprogramming to pr ...
... - A time-shared OS allows the many users to simultaneously share the computer. - Multiple jobs are executed by the CPU switching between them executes multiple jobs; so that, the user may interact with his program while it is running. - A time-shared OS uses CPU scheduling and multiprogramming to pr ...
Study Guide to Accompany Operating Systems Concepts essentials
... ◦ Clustered systems – Linked multiprocessor systems Multiprogramming – Provides efficiency via job scheduling ◦ When OS has to wait (ex: for I/O), switches to another job Timesharing – CPU switches jobs so frequently that each user can interact with each job while it is running (interactive computin ...
... ◦ Clustered systems – Linked multiprocessor systems Multiprogramming – Provides efficiency via job scheduling ◦ When OS has to wait (ex: for I/O), switches to another job Timesharing – CPU switches jobs so frequently that each user can interact with each job while it is running (interactive computin ...
WORD
... ◦ Clustered systems – Linked multiprocessor systems Multiprogramming – Provides efficiency via job scheduling ◦ When OS has to wait (ex: for I/O), switches to another job Timesharing – CPU switches jobs so frequently that each user can interact with each job while it is running (interactive computin ...
... ◦ Clustered systems – Linked multiprocessor systems Multiprogramming – Provides efficiency via job scheduling ◦ When OS has to wait (ex: for I/O), switches to another job Timesharing – CPU switches jobs so frequently that each user can interact with each job while it is running (interactive computin ...
Computer Science 4302 - Angelo State University
... explore system I/O in depth, including I/O system design, interfaces, and internal system structures and functions. Performance issues associated with I/O devices will also be covered. 5. Protection and Security The student will learn the mechanisms necessary for the protection and security of compu ...
... explore system I/O in depth, including I/O system design, interfaces, and internal system structures and functions. Performance issues associated with I/O devices will also be covered. 5. Protection and Security The student will learn the mechanisms necessary for the protection and security of compu ...
Operating System
... With continuing innovations, new architectures and compatible OSs are developed. But their details are not in the scope of this text since the objective here is to give only a general view about developments in OS concept. ...
... With continuing innovations, new architectures and compatible OSs are developed. But their details are not in the scope of this text since the objective here is to give only a general view about developments in OS concept. ...
CMPT 880: Internet Architectures and Protocols
... Linux Scheduler (cont’d) A task is initially assigned a time slice (quantum) Runqueue has two arrays: active and expired A runnable task is eligible for CPU if it has time left in its time slice If time slice runs out, the task is moved to the expired array Priority increase/decrease may occur be ...
... Linux Scheduler (cont’d) A task is initially assigned a time slice (quantum) Runqueue has two arrays: active and expired A runnable task is eligible for CPU if it has time left in its time slice If time slice runs out, the task is moved to the expired array Priority increase/decrease may occur be ...