Operating system organization
... In 1988, Microsoft decided to develop a “new technology” (NT) portable operating system that supported both the OS/2 and POSIX APIs. ...
... In 1988, Microsoft decided to develop a “new technology” (NT) portable operating system that supported both the OS/2 and POSIX APIs. ...
Introduction
... – Most operating systems support multiprogramming to improve CPU efficiency. Multiprogramming simply means that several processes are in memory at the same time. – The memory manager uses swapping and paging to decide which processes (or parts of processes) core images to move between memory and dis ...
... – Most operating systems support multiprogramming to improve CPU efficiency. Multiprogramming simply means that several processes are in memory at the same time. – The memory manager uses swapping and paging to decide which processes (or parts of processes) core images to move between memory and dis ...
Page 1 Operating System Users and User Programs Hardware
... Disks capable of accessing one block of information in 0.002 seconds. so how many instructions in this time??? ...
... Disks capable of accessing one block of information in 0.002 seconds. so how many instructions in this time??? ...
IT ESSENTIALS V. 4.1 Module 5 Fundamental Operating Systems
... Open GL (Open Graphics Library) DirectX Two or more users can work with programs and share peripheral devices at the same time Multi-tasking ...
... Open GL (Open Graphics Library) DirectX Two or more users can work with programs and share peripheral devices at the same time Multi-tasking ...
Protection
... Malicious application can’t take control User data is protected from untrusted users and programs ...
... Malicious application can’t take control User data is protected from untrusted users and programs ...
Lecture 11
... While one program is waiting for I/O to take place, another can be using the CPU to execute instructions. Time-slicing: The CPU may be switched rapidly between different programs, executing a few instructions from each, using a periodic clock-generated interrupt. Slow down execution of each progra ...
... While one program is waiting for I/O to take place, another can be using the CPU to execute instructions. Time-slicing: The CPU may be switched rapidly between different programs, executing a few instructions from each, using a periodic clock-generated interrupt. Slow down execution of each progra ...
Slide 1
... While one program is waiting for I/O to take place, another can be using the CPU to execute instructions. Time-slicing: The CPU may be switched rapidly between different programs, executing a few instructions from each, using a periodic clock-generated interrupt. Slow down execution of each progra ...
... While one program is waiting for I/O to take place, another can be using the CPU to execute instructions. Time-slicing: The CPU may be switched rapidly between different programs, executing a few instructions from each, using a periodic clock-generated interrupt. Slow down execution of each progra ...
Protection of System Resources
... Keep user from monopolizing CPU. Ensure OS regains control of CPU. ...
... Keep user from monopolizing CPU. Ensure OS regains control of CPU. ...
Student Number
... ii) [4] If we add associative registers, and 75 percent of all page-table references are found in the associative registers, what is the effective memory reference time? (Assume that finding a page-table entry in the associative registers takes zero time, if the entry is there.) ...
... ii) [4] If we add associative registers, and 75 percent of all page-table references are found in the associative registers, what is the effective memory reference time? (Assume that finding a page-table entry in the associative registers takes zero time, if the entry is there.) ...
Operating Systems - Bina – Advanced Software Services
... DOS 2.0 in 1983, supported a hard disk, one directory, max 64 files DOS 3.0 ran on Intel’s 286 processor, memory protection features and hard disk DOS 3.1, 1984, supported networking DOS 3.3, 1987, supported 386 processor Windows 3.0, 1990, PC Graphical User Interface (GUI) for the 1st time Introduc ...
... DOS 2.0 in 1983, supported a hard disk, one directory, max 64 files DOS 3.0 ran on Intel’s 286 processor, memory protection features and hard disk DOS 3.1, 1984, supported networking DOS 3.3, 1987, supported 386 processor Windows 3.0, 1990, PC Graphical User Interface (GUI) for the 1st time Introduc ...
DEREE COLLEGE SYLLABUS FOR: ITC 2293 OPERATING
... The formative assessment aim to shape teaching along the semester and prepare students for the summative assessments. The coursework tests Learning Outcomes 1, 2 The final examination tests Learning Outcomes 1, 3, 4 (Guidelines and assessment rubrics are distributed on the first day of classes along ...
... The formative assessment aim to shape teaching along the semester and prepare students for the summative assessments. The coursework tests Learning Outcomes 1, 2 The final examination tests Learning Outcomes 1, 3, 4 (Guidelines and assessment rubrics are distributed on the first day of classes along ...
ppt - Fordham University
... – When it has to wait (for I/O for example), OS switches to another job • 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 – Response time should be < 1 second – Each use ...
... – When it has to wait (for I/O for example), OS switches to another job • 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 – Response time should be < 1 second – Each use ...
7 Operating Systems
... provides supports for other programs. 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 sma ...
... provides supports for other programs. 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 sma ...
Operating Software
... 3. Time-Sharing OS - Allows many tasks to have apparently simultaneous use of one CPU. Each task is allowed a Time Slice - a brief period of time when access to the CPU is available. The concept behind time-sharing systems is the fact that the CPU is so fast in executing a single program, that most ...
... 3. Time-Sharing OS - Allows many tasks to have apparently simultaneous use of one CPU. Each task is allowed a Time Slice - a brief period of time when access to the CPU is available. The concept behind time-sharing systems is the fact that the CPU is so fast in executing a single program, that most ...
Chapter 5 - High Point University
... Where is the information stored? Distributed databases are being defined at least 2 ways. One divides a database and distributes its portions throughout a system, without duplicating the data. A network administrator can access any portion from any node (authorization). The second type of distribute ...
... Where is the information stored? Distributed databases are being defined at least 2 ways. One divides a database and distributes its portions throughout a system, without duplicating the data. A network administrator can access any portion from any node (authorization). The second type of distribute ...
I/O Systems - Ubiquitous Computing Lab
... • Arm only goes as far as the last request in each direction, then reverses direction immediately, without first going all the way to the end of the disk. ...
... • Arm only goes as far as the last request in each direction, then reverses direction immediately, without first going all the way to the end of the disk. ...
Operating Systems I: Chapter 3
... – Main memory is a volatile storage device. It loses its contents in the case of system failure – It is a repository of quickly accessible data shared by the CPU and I/O devices For a program to be executed it must be mapped to absolute addresses and loaded into main memory – To improve CPU utilizat ...
... – Main memory is a volatile storage device. It loses its contents in the case of system failure – It is a repository of quickly accessible data shared by the CPU and I/O devices For a program to be executed it must be mapped to absolute addresses and loaded into main memory – To improve CPU utilizat ...
System Software
... identify and remove the virus found in memory, storage media or incoming files identify a virus by finding its virus signature Signs of viruses Unusual messages on screen Decrease system performance ...
... identify and remove the virus found in memory, storage media or incoming files identify a virus by finding its virus signature Signs of viruses Unusual messages on screen Decrease system performance ...
ch01
... 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 and File Management Learning Steps LAP CC
... manage a computer’s 1.________________________, such as the processor, memory, and input/output devices. b) To allow two or more programs to run simultaneously, an OS can offer 2.__________________ services. c) Within a single program, 3.___________________________ allows multiple parts, or threads, ...
... manage a computer’s 1.________________________, such as the processor, memory, and input/output devices. b) To allow two or more programs to run simultaneously, an OS can offer 2.__________________ services. c) Within a single program, 3.___________________________ allows multiple parts, or threads, ...
interrupt - Universidade de Coimbra
... Device-status table contains an entry for each I/O device indicating its type, address, and state Operating system indexes into I/O device table to determine device status and to modify table entry to include interrupt ...
... Device-status table contains an entry for each I/O device indicating its type, address, and state Operating system indexes into I/O device table to determine device status and to modify table entry to include interrupt ...
Operating Systems – OS Architecture Models
... • MS-DOS – written to provide the most functionality in the least space – not divided into modules – although MS-DOS has some structure, its interfaces and levels of functionality are not well separated ...
... • MS-DOS – written to provide the most functionality in the least space – not divided into modules – although MS-DOS has some structure, its interfaces and levels of functionality are not well separated ...
operating system
... provides supports for other programs. 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 sma ...
... provides supports for other programs. 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 sma ...