Course Title Operating Systems Course Code CUIT 109 Credits
... Credits 12 The course’s focus is on how an Operating System manages system resources e.g. memory, CPU files etc, while avoiding possible deadlocks and / or starvation. By the end of the course students should be able to : Describe the necessary components and functions of an operating system. Co ...
... Credits 12 The course’s focus is on how an Operating System manages system resources e.g. memory, CPU files etc, while avoiding possible deadlocks and / or starvation. By the end of the course students should be able to : Describe the necessary components and functions of an operating system. Co ...
Lecture 2, Part 1
... – CPU transfers data to/from device controller registers – Transfers are typically one byte or word at a time – May be accomplished with normal or I/O instructions ...
... – CPU transfers data to/from device controller registers – Transfers are typically one byte or word at a time – May be accomplished with normal or I/O instructions ...
round robin
... submitted for processing • i.e. controls the degree of multiprogramming • Once submitted, a job becomes a process for the short term scheduler • (or it becomes a swapped out job for the medium term scheduler) ...
... submitted for processing • i.e. controls the degree of multiprogramming • Once submitted, a job becomes a process for the short term scheduler • (or it becomes a swapped out job for the medium term scheduler) ...
Operating Systems
... For example, it is responsible for loading other programs into memory for execution. However, the operating system itself is a program that needs to be loaded into the memory and be run. How is this dilemma solved? The solution is a two-stage process. A very small section of memory is made of ROM an ...
... For example, it is responsible for loading other programs into memory for execution. However, the operating system itself is a program that needs to be loaded into the memory and be run. How is this dilemma solved? The solution is a two-stage process. A very small section of memory is made of ROM an ...
PowerPoint
... available multiprocessor hardware on any system it is run on. z It allows programmers to structure their code into independently executable units and maximize concurrency. z Threads reduce the need to use fork to create child processes, thus improving each process performance (less context switching ...
... available multiprocessor hardware on any system it is run on. z It allows programmers to structure their code into independently executable units and maximize concurrency. z Threads reduce the need to use fork to create child processes, thus improving each process performance (less context switching ...
chapter4
... serve the next process in the queue. – The manager maintains a queue for each I/O device or one or more queues for similar I/O devices. – The manager controls the different policies for ...
... serve the next process in the queue. – The manager maintains a queue for each I/O device or one or more queues for similar I/O devices. – The manager controls the different policies for ...
Operating System Objectives and functions-D2
... contention. – Error detection – OS needs to be constantly aware of possible errors • May occur in the CPU and memory hardware, in I/O devices, in user program • For each type of error, OS should take the appropriate action to ensure correct and consistent computing • Debugging facilities can greatly ...
... contention. – Error detection – OS needs to be constantly aware of possible errors • May occur in the CPU and memory hardware, in I/O devices, in user program • For each type of error, OS should take the appropriate action to ensure correct and consistent computing • Debugging facilities can greatly ...
Powerpoint source
... – What algorithms are typically used • We will do this through reading, lectures, and a project. • You will need to keep up with all three of these. ...
... – What algorithms are typically used • We will do this through reading, lectures, and a project. • You will need to keep up with all three of these. ...
Operating Systems I
... Virtual memory (“Imaginary memory”) o Programs only need their current data in memory. (“What’s your VIN?”) o Store remainder on disk & keep location. o Bring other data back (and put this data out) when other data is needed. o Creates the illusion of additional memory by rotating (swapping) program ...
... Virtual memory (“Imaginary memory”) o Programs only need their current data in memory. (“What’s your VIN?”) o Store remainder on disk & keep location. o Bring other data back (and put this data out) when other data is needed. o Creates the illusion of additional memory by rotating (swapping) program ...
hw_ch1
... (10) 16. A computer has a cache, main memory, and a disk used for virtual memory. If a referenced word is in the cache, 20ns are required to access it. If it is in main memory but not in the cache, 60ns are needed to load it into the cache (this includes the time to originally check the cache), and ...
... (10) 16. A computer has a cache, main memory, and a disk used for virtual memory. If a referenced word is in the cache, 20ns are required to access it. If it is in main memory but not in the cache, 60ns are needed to load it into the cache (this includes the time to originally check the cache), and ...
Distributed Systems Major Design Issues
... Processes Coordination required to achieve synchronization: Synchronization Types: ...
... Processes Coordination required to achieve synchronization: Synchronization Types: ...
Distributed Systems Major Design Issues
... Processes Coordination required to achieve synchronization: Synchronization Types: ...
... Processes Coordination required to achieve synchronization: Synchronization Types: ...
Slides
... But if we want to start several processes, then the running program in CPU (current process) has to be stopped for a while and other program (process) has to run in CPU. – Process management becomes an important issue – To do process switch, we have to save the state/context (register values) of the ...
... But if we want to start several processes, then the running program in CPU (current process) has to be stopped for a while and other program (process) has to run in CPU. – Process management becomes an important issue – To do process switch, we have to save the state/context (register values) of the ...
Operating Systems
... • Determines which programs are submitted for processing • i.e. controls the degree of multiprogramming • Once submitted, a job becomes a process for the short term scheduler • (or it becomes a swapped out job for the medium term scheduler) ...
... • Determines which programs are submitted for processing • i.e. controls the degree of multiprogramming • Once submitted, a job becomes a process for the short term scheduler • (or it becomes a swapped out job for the medium term scheduler) ...
Mod_2-Ch3_Ch4
... the various processes in such a way that the CPU and other active resources are maintained busy the longest period possible. • If there is only one CPU in the system, then only one process can be in execution at any given time. • The other processes are ready, waiting for CPU service. Processes also ...
... the various processes in such a way that the CPU and other active resources are maintained busy the longest period possible. • If there is only one CPU in the system, then only one process can be in execution at any given time. • The other processes are ready, waiting for CPU service. Processes also ...
Chapter 1 Computer Basics
... serve the next process in the queue. – The manager maintains a queue for each I/O device or one or more queues for similar I/O devices. – The manager controls the different policies for ...
... serve the next process in the queue. – The manager maintains a queue for each I/O device or one or more queues for similar I/O devices. – The manager controls the different policies for ...
Unit-5 - Ipemgzb.ac.in
... Linux uses the same internal representation for processes and threads; a thread is simply a new process that happens to share the same address space as its parent. A distinction is only made when a new thread is created by the clone system call. – fork creates a new process with its own entirely new ...
... Linux uses the same internal representation for processes and threads; a thread is simply a new process that happens to share the same address space as its parent. A distinction is only made when a new thread is created by the clone system call. – fork creates a new process with its own entirely new ...
CS 381 Operating Systems
... CS 381: Operating Systems (4 units) An operating system is an intermediary between the user programs and the computer hardware resources. By managing disparate hardware resources, an OS shields user programs from the complexities of individual hardware devices and issues such as concurrency and fail ...
... CS 381: Operating Systems (4 units) An operating system is an intermediary between the user programs and the computer hardware resources. By managing disparate hardware resources, an OS shields user programs from the complexities of individual hardware devices and issues such as concurrency and fail ...
Operating Systems Concepts Resource Abstraction
... copy of everything. – exec system call used after a fork to replace the process’ memory space with a new program. – child and parent compete for CPU like two normal processes. ...
... copy of everything. – exec system call used after a fork to replace the process’ memory space with a new program. – child and parent compete for CPU like two normal processes. ...
Operating Systems
... A program that is loaded into memory and is 程序 executing is commonly referred to as a process. When a process executes, it typically executes for only a short time before it either finishes or needs to perform I/O. Rather than let the CPU sit idle when I/O takes place, the OS will rapidly switch the ...
... A program that is loaded into memory and is 程序 executing is commonly referred to as a process. When a process executes, it typically executes for only a short time before it either finishes or needs to perform I/O. Rather than let the CPU sit idle when I/O takes place, the OS will rapidly switch the ...
Operating Systems Operating Systems Operating Systems
... cycles to accomplish its task in a reasonable amount of time. – The operating system requires some CPU cycles to perform the context switching – If too many processes are started, most of the CPU cycles will be used to perform the switching and little real work will be done. This is called thrashing ...
... cycles to accomplish its task in a reasonable amount of time. – The operating system requires some CPU cycles to perform the context switching – If too many processes are started, most of the CPU cycles will be used to perform the switching and little real work will be done. This is called thrashing ...
What is a Process? Answer 1: a process is an abstraction of a
... • all processes share the available hardware resources, with the sharing coordinated by the operating system: – Each process uses some of the available memory to hold its address space. The OS decides which memory and how much memory each process gets – OS can coordinate shared access to devices (ke ...
... • all processes share the available hardware resources, with the sharing coordinated by the operating system: – Each process uses some of the available memory to hold its address space. The OS decides which memory and how much memory each process gets – OS can coordinate shared access to devices (ke ...
The Drama of the Interrupted CPU
... of memory on the stack and then transfer my contents via the data bus to RAM. As you can imagine, it will take several clock ticks for me to do an orderly transfer to RAM where the register contents etc. are stacked in such a way that I’ll be able to retrieve the contents later in order to remember ...
... of memory on the stack and then transfer my contents via the data bus to RAM. As you can imagine, it will take several clock ticks for me to do an orderly transfer to RAM where the register contents etc. are stacked in such a way that I’ll be able to retrieve the contents later in order to remember ...