What is an Operating System?
... Each processor runs and identical copy of the operating system. Many processes can run at once without performance deterioration. Most modern operating systems support SMP ...
... Each processor runs and identical copy of the operating system. Many processes can run at once without performance deterioration. Most modern operating systems support SMP ...
lecture6
... The acronym DOS was not new even then. It had originally been used by IBM in the 1960sin the name of an operating system (i.e., DOS/360) for its System/360 computer. At that time the use of disks for storing the operating system and data was considered cutting edge technology. Until its acquisition ...
... The acronym DOS was not new even then. It had originally been used by IBM in the 1960sin the name of an operating system (i.e., DOS/360) for its System/360 computer. At that time the use of disks for storing the operating system and data was considered cutting edge technology. Until its acquisition ...
Making the Most of CD ROM Technology
... either model. Primary advantages to miniserver systems are the ability to add CDROM drives to a network without downing the main file system server, low cost, and easy installation. Check for system Scalability when looking at this type of installation. How many miniservers can be installed on the L ...
... either model. Primary advantages to miniserver systems are the ability to add CDROM drives to a network without downing the main file system server, low cost, and easy installation. Check for system Scalability when looking at this type of installation. How many miniservers can be installed on the L ...
An Introduction to MS-DOS
... The interrupt vector table occupies the lowest 1024 bytes of memory (locations 00000003FFH); its address and length are hardwired into the processor and cannot be changed. Each double word position in the table is called interrupt vector and contains the segment and offset of an interrupt handler r ...
... The interrupt vector table occupies the lowest 1024 bytes of memory (locations 00000003FFH); its address and length are hardwired into the processor and cannot be changed. Each double word position in the table is called interrupt vector and contains the segment and offset of an interrupt handler r ...
Computer system structure overview
... Hidden part of some otherwise useful software E.g., a text-editor program written by a user may include hidden code to search the file for certain keywords Another example may be a key-stroke logger Trojan horse often may open a “backdoor” and start ...
... Hidden part of some otherwise useful software E.g., a text-editor program written by a user may include hidden code to search the file for certain keywords Another example may be a key-stroke logger Trojan horse often may open a “backdoor” and start ...
Lab_1.pdf
... Keeping track of software -- With Linux, there are no serial numbers of software or passwords to lose or worry about. More security -- These days, operating systems are less vulnerable than the applications that run on them. Therefore a vital aspect of PC security is keeping your apps up-to-date wit ...
... Keeping track of software -- With Linux, there are no serial numbers of software or passwords to lose or worry about. More security -- These days, operating systems are less vulnerable than the applications that run on them. Therefore a vital aspect of PC security is keeping your apps up-to-date wit ...
Operating-System Structures
... Apple Mac OS X as “Aqua” GUI interface with UNIX kernel underneath and shells available Solaris is CLI with optional GUI interfaces (Java Desktop, KDE) CSC 4103: Operating Systems ...
... Apple Mac OS X as “Aqua” GUI interface with UNIX kernel underneath and shells available Solaris is CLI with optional GUI interfaces (Java Desktop, KDE) CSC 4103: Operating Systems ...
Threads
... Multiple Cores ! Modern computers often have several if not dozens of cores ! Each core has its own registers, but cores share memory and devices ! Cores can run user processes in parallel ! Cores need to synchronize access to PCBs and devices ...
... Multiple Cores ! Modern computers often have several if not dozens of cores ! Each core has its own registers, but cores share memory and devices ! Cores can run user processes in parallel ! Cores need to synchronize access to PCBs and devices ...
Master boot record
... and installed software. Having a separate area for operating system virtual memory swapping/paging. Keeping frequently used programs and data near each other. Having cache and log files separate from other files. These can change size dynamically and rapidly, potentially making a file system full. U ...
... and installed software. Having a separate area for operating system virtual memory swapping/paging. Keeping frequently used programs and data near each other. Having cache and log files separate from other files. These can change size dynamically and rapidly, potentially making a file system full. U ...
Linux-Spr-2001-sect-1-group
... and does not provide driver support for it’s own printers. •Dell has recently begun selling a computer that comes preconfigured with Linux installed. This is the first time in history that a major computer company has manufactured a PC that comes with Linux. •Some people say that Linux was done righ ...
... and does not provide driver support for it’s own printers. •Dell has recently begun selling a computer that comes preconfigured with Linux installed. This is the first time in history that a major computer company has manufactured a PC that comes with Linux. •Some people say that Linux was done righ ...
Chapter 1: Introduction What is an Operating System? Computer
... provides basic computing resources (CPU, memory, I/O devices) 2. Operating system controls and coordinates the use of the hardware among the various application programs for the various users ...
... provides basic computing resources (CPU, memory, I/O devices) 2. Operating system controls and coordinates the use of the hardware among the various application programs for the various users ...
Operating Systems I: Chapter 2
... An interrupt is handled by: – A hardware check against the interrupt mask to see if the interrupt is enabled – Incoming interrupts of lower priority are disabled to prevent a lost interrupt – Storing the current state of the process The operating system preserves the state of the CPU by storing re ...
... An interrupt is handled by: – A hardware check against the interrupt mask to see if the interrupt is enabled – Incoming interrupts of lower priority are disabled to prevent a lost interrupt – Storing the current state of the process The operating system preserves the state of the CPU by storing re ...
Towards High-Performance Application-Level Storage
... Figure 1: Overhead in µs of various Linux filesystem implementations, when conducting small, persistent writes. Our approach instead is to associate each application with the directories and files it manages, as if they were dynamically mounted network file systems. This way, an application is free ...
... Figure 1: Overhead in µs of various Linux filesystem implementations, when conducting small, persistent writes. Our approach instead is to associate each application with the directories and files it manages, as if they were dynamically mounted network file systems. This way, an application is free ...
ch2
... Chapter 2: Operating-System Structures Operating System Services User Operating System Interface System Calls Types of System Calls System Programs Operating System Design and Implementation Operating System Structure ...
... Chapter 2: Operating-System Structures Operating System Services User Operating System Interface System Calls Types of System Calls System Programs Operating System Design and Implementation Operating System Structure ...
History of OS - EECG Toronto
... • Do you want to wait for a day just to find out your program doesn’t compile? ...
... • Do you want to wait for a day just to find out your program doesn’t compile? ...
Operating System
... What are other program management features of operating systems? multiprocessing Can support two or more processors running programs at same time ...
... What are other program management features of operating systems? multiprocessing Can support two or more processors running programs at same time ...
lecture2
... additional software. Systems generally first distinguish among users, to determine who can do what User identities (user IDs--security IDs in Windows) include name and associated number, one per user User ID then associated with all files, processes of that user to ...
... additional software. Systems generally first distinguish among users, to determine who can do what User identities (user IDs--security IDs in Windows) include name and associated number, one per user User ID then associated with all files, processes of that user to ...
H 10.3. File-System Interface
... Constructing such a list may be a tedious and unrewarding task, especially if we do not know in advance the list of users in the system. The directory entry, previously of fixed size, now needs to be of variable size, resulting in more complicated space management. ...
... Constructing such a list may be a tedious and unrewarding task, especially if we do not know in advance the list of users in the system. The directory entry, previously of fixed size, now needs to be of variable size, resulting in more complicated space management. ...
Overview of the Program Slides
... Distributed Shared Memory • “Simultaneous” read/write access by spatially distributed processors • Abstraction layer of an implementation built from message passing primitives • Semantics not so clean ...
... Distributed Shared Memory • “Simultaneous” read/write access by spatially distributed processors • Abstraction layer of an implementation built from message passing primitives • Semantics not so clean ...
QNX Corporate Sales Presentation
... Factor #3: Kernel Time Kernel operations must be pre-emptible – if they are not, an unknown amount of time can be spent in the kernel performing an operation on behalf of a user process – can cause real-time process to miss deadline All kernels have some window (or multiple windows) of time whe ...
... Factor #3: Kernel Time Kernel operations must be pre-emptible – if they are not, an unknown amount of time can be spent in the kernel performing an operation on behalf of a user process – can cause real-time process to miss deadline All kernels have some window (or multiple windows) of time whe ...
Chapter 1
... switches jobs so frequently that users can interact with each job while it is running, creating interactive computing (e.g., a lawyer doesn’t work on one case at a time) ...
... switches jobs so frequently that users can interact with each job while it is running, creating interactive computing (e.g., a lawyer doesn’t work on one case at a time) ...