basic-os-concepts
... kept in memory and on disk (the CPU is allocated to a job only if the job is in memory). A job swapped in and out of memory to the disk. On-line communication between the user and the system is provided; when the operating system finishes the execution of one command, it seeks the next “control stat ...
... kept in memory and on disk (the CPU is allocated to a job only if the job is in memory). A job swapped in and out of memory to the disk. On-line communication between the user and the system is provided; when the operating system finishes the execution of one command, it seeks the next “control stat ...
Operating Systems CIS 250
... • O/S - running process with address FFF0D • I/O requests to read; produces interrupt • O/S saves the address of process on the system stack; disables other interrupts; gets the address of the I/O service from the vector; service routine is run • Get FFF0D from stack; return to program counter; enab ...
... • O/S - running process with address FFF0D • I/O requests to read; produces interrupt • O/S saves the address of process on the system stack; disables other interrupts; gets the address of the I/O service from the vector; service routine is run • Get FFF0D from stack; return to program counter; enab ...
Operating Systems - Computer Science
... Processor time alternates between execution of user programs and execution of the monitor ...
... Processor time alternates between execution of user programs and execution of the monitor ...
lec15
... How to share physical memory across multiple processes? » Many programs do not need all of their code and data at once (or ever) – no need to allocate memory for it » A program can run on machine with less memory than it “needs” ...
... How to share physical memory across multiple processes? » Many programs do not need all of their code and data at once (or ever) – no need to allocate memory for it » A program can run on machine with less memory than it “needs” ...
2140702
... 6. Write a shell script which will generate first n fibonnacci numbers like: 1, 1, 2, 3, 5, 13,… 7. Write a menu driven shell script which will print the following menu and execute the given task. 8. MENU 9. Display calendar of current month 10. Display today’s date and time 11. Display usernames th ...
... 6. Write a shell script which will generate first n fibonnacci numbers like: 1, 1, 2, 3, 5, 13,… 7. Write a menu driven shell script which will print the following menu and execute the given task. 8. MENU 9. Display calendar of current month 10. Display today’s date and time 11. Display usernames th ...
CS 414/415 Systems Programming and
... – Overlaps I/O processing of a job with computation of another – Benefits from I/O devices that can operate asynchronously – Requires the use of interrupts and DMA – Optimizes for throughput at the cost of response time ...
... – Overlaps I/O processing of a job with computation of another – Benefits from I/O devices that can operate asynchronously – Requires the use of interrupts and DMA – Optimizes for throughput at the cost of response time ...
cs459 - Operating Systems: Introduction
... Memory Management • Memory: volatile large array of bytes directly accessible by the processor. Can be DRAM (dynamic ram – one transistor per bit) or RAM (volatile transistor based storage) ...
... Memory Management • Memory: volatile large array of bytes directly accessible by the processor. Can be DRAM (dynamic ram – one transistor per bit) or RAM (volatile transistor based storage) ...
Operating system
... switches jobs so frequently that users can interact with each job while it is running, creating interactive computing – Response time should be < 1 second – Each user has at least one program executing in memory process – If several jobs ready to run at the same time CPU scheduling – If processes ...
... switches jobs so frequently that users can interact with each job while it is running, creating interactive computing – Response time should be < 1 second – Each user has at least one program executing in memory process – If several jobs ready to run at the same time CPU scheduling – If processes ...
PowerPoint - School of Computer Science
... The machine supports 10,000 words of logical memory overall, broken into pages of 100 words each. This particular machine contains 400 physical memory locations. Suppose that the machine starts to execute a program. The page table is initially empty, and is filled as necessary. Suppose that the prog ...
... The machine supports 10,000 words of logical memory overall, broken into pages of 100 words each. This particular machine contains 400 physical memory locations. Suppose that the machine starts to execute a program. The page table is initially empty, and is filled as necessary. Suppose that the prog ...
PDF
... Core OS Issues r Extensibility /Tuning m What interfaces are provided to change operating system behavior? m How does (or does) the OS optimize its behavior based on the characteristics of the hardware or the application mix? ...
... Core OS Issues r Extensibility /Tuning m What interfaces are provided to change operating system behavior? m How does (or does) the OS optimize its behavior based on the characteristics of the hardware or the application mix? ...
Operating Systems
... Processor time alternates between execution of user programs and execution of the monitor ...
... Processor time alternates between execution of user programs and execution of the monitor ...
PDF
... physical addresses into machine addresses. DISCO’s device drivers then interact directly with the physical device. All the virtual machines can share the same root disk containing the kernel and application programs. ...
... physical addresses into machine addresses. DISCO’s device drivers then interact directly with the physical device. All the virtual machines can share the same root disk containing the kernel and application programs. ...
Operating System Structures
... • Memory can be seen as a large array of words or bytes, each having own address; can be accessed quickly by CPU and I/O devices • Main memory is volatile (lost on crash or power-off) • Operating system is responsible for the following tasks: – Memory allocation and freeing when asked by processes – ...
... • Memory can be seen as a large array of words or bytes, each having own address; can be accessed quickly by CPU and I/O devices • Main memory is volatile (lost on crash or power-off) • Operating system is responsible for the following tasks: – Memory allocation and freeing when asked by processes – ...
Document
... Partition MM has the OS and any number of other programs in memory at one time There are two schemes for dividing up memory for programs: – Fixed partitions Main memory is divided into a fixed number of partitions into which programs can be loaded – Dymanic partitions Partitions are created as neede ...
... Partition MM has the OS and any number of other programs in memory at one time There are two schemes for dividing up memory for programs: – Fixed partitions Main memory is divided into a fixed number of partitions into which programs can be loaded – Dymanic partitions Partitions are created as neede ...
Chapter 7 Memory Management
... Fixed Partitioning Problems • A program may be too big to fit into a partition • Main memory use is inefficient. – Any program, no matter how small, occupies an entire partition. – This is results in internal fragmentation (wasted space internal to a partition). ...
... Fixed Partitioning Problems • A program may be too big to fit into a partition • Main memory use is inefficient. – Any program, no matter how small, occupies an entire partition. – This is results in internal fragmentation (wasted space internal to a partition). ...
Slide 2: Operating System Overview
... Processor time alternates between execution of user programs and execution of the monitor ...
... Processor time alternates between execution of user programs and execution of the monitor ...
PPT - Department of Computer Science
... physical addresses into machine addresses. DISCO’s device drivers then interact directly with the physical device. All the virtual machines can share the same root disk containing the kernel and application programs. ...
... physical addresses into machine addresses. DISCO’s device drivers then interact directly with the physical device. All the virtual machines can share the same root disk containing the kernel and application programs. ...
dsk-01-intro
... Timesharing (multitasking) is logical extension in which CPU switches jobs so frequently that users can interact with each job while it is running, creating interactive computing ...
... Timesharing (multitasking) is logical extension in which CPU switches jobs so frequently that users can interact with each job while it is running, creating interactive computing ...
Disco : Running commodity operating system on scalable
... VM executes instruction to access I/O Trap generated by CPU (based on memory or privilege protection) transfers control to VMM. VMM emulates I/O instruction, saving information about where this came from ...
... VM executes instruction to access I/O Trap generated by CPU (based on memory or privilege protection) transfers control to VMM. VMM emulates I/O instruction, saving information about where this came from ...
Operating System Objectives and functions-D2
... • 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 enhance the user’s and programmer’s abilities to efficiently use the system – Acco ...
... • 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 enhance the user’s and programmer’s abilities to efficiently use the system – Acco ...
Hardware
... A file system is the part of the operating system that is responsible for organizing files and the resources. A file system is the part of the operating system that is responsible for managing files and the resources on which these reside. Without a file system, efficient computing would essentially ...
... A file system is the part of the operating system that is responsible for organizing files and the resources. A file system is the part of the operating system that is responsible for managing files and the resources on which these reside. Without a file system, efficient computing would essentially ...