Chapter 1: Introduction to Computers
... Reformatting disk usually erases only file allocation table and leaves actual files on disk ...
... Reformatting disk usually erases only file allocation table and leaves actual files on disk ...
Operating Systems
... *NIX - This includes the OS's like UNIX, LINUX, etc. These are commonly called "workstations". UNIX is a command prompt OS, much like the now defunct Microsoft DOS operating system. Unix is by far the oldest of the operating systems, having been in existence for a good 20 years. *NIX systems are now ...
... *NIX - This includes the OS's like UNIX, LINUX, etc. These are commonly called "workstations". UNIX is a command prompt OS, much like the now defunct Microsoft DOS operating system. Unix is by far the oldest of the operating systems, having been in existence for a good 20 years. *NIX systems are now ...
I. Introduction, system calls, dual mode
... Copyright Notice: The lecture notes are modifications of the slides accompanying the course book “Operating System Concepts”, 9th edition, 2013 by Silberschatz, Galvin and Gagne. ...
... Copyright Notice: The lecture notes are modifications of the slides accompanying the course book “Operating System Concepts”, 9th edition, 2013 by Silberschatz, Galvin and Gagne. ...
Cybersecurity and Information Assurance PPT
... • Snort’s open source network-based intrusion detection system has the ability to perform realtime traffic analysis and packet logging on Internet Protocol (IP) networks. • Snort performs protocol analysis, content searching, and content matching. • The program can also be used to detect probes or a ...
... • Snort’s open source network-based intrusion detection system has the ability to perform realtime traffic analysis and packet logging on Internet Protocol (IP) networks. • Snort performs protocol analysis, content searching, and content matching. • The program can also be used to detect probes or a ...
Document
... • Command-line user interface: prompt where you must type a command to tell the operating system what to do, or it can be a • graphical user interface (GUI): consists of a series of visual depictions of tasks known as icons that you may use to control the operating system • system services: programs ...
... • Command-line user interface: prompt where you must type a command to tell the operating system what to do, or it can be a • graphical user interface (GUI): consists of a series of visual depictions of tasks known as icons that you may use to control the operating system • system services: programs ...
PDF
... 4. Threads vs. Processes The file parcount.py contains a partial implementation of a program that runs N jobs, each of which does some I/O and some processing. It uses three strategies to run the jobs: run_sequential runs them all sequentially. The run_threaded divides the jobs into n threads, each ...
... 4. Threads vs. Processes The file parcount.py contains a partial implementation of a program that runs N jobs, each of which does some I/O and some processing. It uses three strategies to run the jobs: run_sequential runs them all sequentially. The run_threaded divides the jobs into n threads, each ...
Chapter 2.pdf
... 2) Another set of OS functions exists for ensuring the efficient operation of system itself via resource sharing • Resource allocation: when multiple users running concurrently, resources must be allocated to each of the. • Accounting: To keep track of which user use how much and what kinds of compu ...
... 2) Another set of OS functions exists for ensuring the efficient operation of system itself via resource sharing • Resource allocation: when multiple users running concurrently, resources must be allocated to each of the. • Accounting: To keep track of which user use how much and what kinds of compu ...
What is an Operating System?
... with I/O devices. If a user process tries to execute a privileged instruction, a trap should be generated and process should be terminated prematurely. At the same time, a piece of operating system code should be allowed to execute privileged instructions. In order for the CPU to be able to differen ...
... with I/O devices. If a user process tries to execute a privileged instruction, a trap should be generated and process should be terminated prematurely. At the same time, a piece of operating system code should be allowed to execute privileged instructions. In order for the CPU to be able to differen ...
Final Exam - soe.ucsc.edu
... 7. Suppose that your memory management hardware supports neither reference bits nor modified bits, but does support read-only/read-write bits and valid/invalid bits. Explain how you can use the existing hardware to implement a software soluton that will emulate the functionality of the other bits. ...
... 7. Suppose that your memory management hardware supports neither reference bits nor modified bits, but does support read-only/read-write bits and valid/invalid bits. Explain how you can use the existing hardware to implement a software soluton that will emulate the functionality of the other bits. ...
Operating Systems Principles Lecture 1: Introduction
... interposed between a running program and a lowspeed device involved with the program in input/output. Example: Instead of writing directly to a printer, outputs are written to the disk. ...
... interposed between a running program and a lowspeed device involved with the program in input/output. Example: Instead of writing directly to a printer, outputs are written to the disk. ...
1.Introduction
... SISD: a computer with a single instruction stream and a single data stream. e.g. all traditional uniprocessor computers (those having only one CPU), from personal computers to large mainframes. SIMD: single instruction, multiple data stream. e.g. array processors with one instruction unit that fetch ...
... SISD: a computer with a single instruction stream and a single data stream. e.g. all traditional uniprocessor computers (those having only one CPU), from personal computers to large mainframes. SIMD: single instruction, multiple data stream. e.g. array processors with one instruction unit that fetch ...
OSreviewS2004
... • Long-term scheduler (or job scheduler) – selects which processes should be brought into the ready queue. • Short-term scheduler (or CPU scheduler) – selects which process should be executed next and allocates CPU. • Midterm scheduler ...
... • Long-term scheduler (or job scheduler) – selects which processes should be brought into the ready queue. • Short-term scheduler (or CPU scheduler) – selects which process should be executed next and allocates CPU. • Midterm scheduler ...
Operating Systems
... Basic concepts (overview of disk structure, file structure, boot control block, super block, inode, per process file descriptor table, system-wide open-file table, etc.) Directory implementation Free space management methods Space Allocation Methods Time and space performance of allocation methods B ...
... Basic concepts (overview of disk structure, file structure, boot control block, super block, inode, per process file descriptor table, system-wide open-file table, etc.) Directory implementation Free space management methods Space Allocation Methods Time and space performance of allocation methods B ...
Open Source Software
... • Variety of licenses • FREE – no restrictions on its use • World-wide community of developers and ...
... • Variety of licenses • FREE – no restrictions on its use • World-wide community of developers and ...
Introduction
... Mainframe operating systems Server operating systems Multiprocessor operating systems Personal computer operating systems Real-time operating systems Embedded operating systems Smart card operating systems ...
... Mainframe operating systems Server operating systems Multiprocessor operating systems Personal computer operating systems Real-time operating systems Embedded operating systems Smart card operating systems ...
Operating Systems
... 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 and holds a small program called the bootstrap program. When the computer is turned on, the CPU counter is set to the ...
... 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 and holds a small program called the bootstrap program. When the computer is turned on, the CPU counter is set to the ...
Course\FOS\FOS Unit-1 2014
... An OS is similar to a government. The components (resources) of a computer are its hardware, software, and data. The OS provides the means for the proper use of these resources in the operation of the computer system. Like a government, the OS performs no useful function by itself. It simply provid ...
... An OS is similar to a government. The components (resources) of a computer are its hardware, software, and data. The OS provides the means for the proper use of these resources in the operation of the computer system. Like a government, the OS performs no useful function by itself. It simply provid ...
Operating Systems
... coherent set of data The way data are structured on a mass storage device is called a file system; a file manager may use different file system for different device ...
... coherent set of data The way data are structured on a mass storage device is called a file system; a file manager may use different file system for different device ...
Operating Systems Principles Lecture 1: Introduction
... interposed between a running program and a lowspeed device involved with the program in input/output. Example: Instead of writing directly to a printer, outputs are written to the disk. ...
... interposed between a running program and a lowspeed device involved with the program in input/output. Example: Instead of writing directly to a printer, outputs are written to the disk. ...
Windows XP Boot Process
... Drivers are kernel-mode components required by devices to function within an operating system. Services are components that support operating system functions and applications. Services can run in a different context than user applications and typically do not offer many user-configurable options. S ...
... Drivers are kernel-mode components required by devices to function within an operating system. Services are components that support operating system functions and applications. Services can run in a different context than user applications and typically do not offer many user-configurable options. S ...
Access Security Requirements
... 5.1 Protect Internet connections with dedicated, industry-recognized Firewalls that are configured and managed using industry best security practices. 5.2 Internal private Internet Protocol (IP) addresses must not be publicly accessible or natively routed to the Internet. Network address translation ...
... 5.1 Protect Internet connections with dedicated, industry-recognized Firewalls that are configured and managed using industry best security practices. 5.2 Internal private Internet Protocol (IP) addresses must not be publicly accessible or natively routed to the Internet. Network address translation ...
General Overview of Attacks
... An intrusion detection system that examines this file system data can alert an administrator whenever a system binary file (such as ps, login, or ls program) is modified. Since normal user have no legitimate reason to alter these files, a change to a system binary file indicates that the system ha ...
... An intrusion detection system that examines this file system data can alert an administrator whenever a system binary file (such as ps, login, or ls program) is modified. Since normal user have no legitimate reason to alter these files, a change to a system binary file indicates that the system ha ...
