os-1
... Windows, Unix, MS-DOS) and the issues associated with them To be able to use performance measures ...
... Windows, Unix, MS-DOS) and the issues associated with them To be able to use performance measures ...
Introduction to Computer and Operating Systems
... Important principle, performed at many levels in a computer (in hardware, operating system, software) Information in use copied from slower to faster storage temporarily Faster storage (cache) checked first to determine if information is there – If it is, information used directly from the cache (fa ...
... Important principle, performed at many levels in a computer (in hardware, operating system, software) Information in use copied from slower to faster storage temporarily Faster storage (cache) checked first to determine if information is there – If it is, information used directly from the cache (fa ...
Introduction to Computer and Operating Systems
... Important principle, performed at many levels in a computer (in hardware, operating system, software) Information in use copied from slower to faster storage temporarily Faster storage (cache) checked first to determine if information is there – If it is, information used directly from the cache (fa ...
... Important principle, performed at many levels in a computer (in hardware, operating system, software) Information in use copied from slower to faster storage temporarily Faster storage (cache) checked first to determine if information is there – If it is, information used directly from the cache (fa ...
Processes Process States
... Process States • Five states in general, with specific operating systems ...
... Process States • Five states in general, with specific operating systems ...
The Architecture of a Reliable Operating System,
... Before we continue with the discussion of the components of MINIX 3, we give some examples to illustrate how our multiserver operating system actually works. Fig. 4 also shows some typical IPC interactions initiated by user processes. Although the POSIX operating system interface is implemented by m ...
... Before we continue with the discussion of the components of MINIX 3, we give some examples to illustrate how our multiserver operating system actually works. Fig. 4 also shows some typical IPC interactions initiated by user processes. Although the POSIX operating system interface is implemented by m ...
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... § Originally developed at AT&T in the late 60s/early 70s. § Freely given to universities in the 70s. § Berkeley scientists continued to develop the OS as BSD Unix in parallel with AT&T (AT&T eventually licensed it for ...
... § Originally developed at AT&T in the late 60s/early 70s. § Freely given to universities in the 70s. § Berkeley scientists continued to develop the OS as BSD Unix in parallel with AT&T (AT&T eventually licensed it for ...
PowerPoint XP
... A microkernel proxy for the real process Microkernel’s interface to the real process Contains pointers to the various resources owned by the process e.g., threads and address spaces ...
... A microkernel proxy for the real process Microkernel’s interface to the real process Contains pointers to the various resources owned by the process e.g., threads and address spaces ...
ppt
... "responsibility" of the kernel, and most things are done in userspace with communication via IPC. But doesn't this use of IPC impose a dramatic speed-hit? How fast is the Mach system? It seems that all this flexibility and simplicity through use of simple primitives will come at a large overhead. ...
... "responsibility" of the kernel, and most things are done in userspace with communication via IPC. But doesn't this use of IPC impose a dramatic speed-hit? How fast is the Mach system? It seems that all this flexibility and simplicity through use of simple primitives will come at a large overhead. ...
What is a Process? Answer 1: a process is an abstraction of a
... The OS decides which memory and how much memory each process gets – OS can coordinate shared access to devices (keyboards, disks), since processes use these devices indirectly, by making system calls. – Processes timeshare the processor(s). Again, timesharing is controlled by the operating system. • ...
... The OS decides which memory and how much memory each process gets – OS can coordinate shared access to devices (keyboards, disks), since processes use these devices indirectly, by making system calls. – Processes timeshare the processor(s). Again, timesharing is controlled by the operating system. • ...
Process Control Block entity that defines a process to the OS
... Operating systems must interleave the execution of a number of processes to maximize processor use – while providing reasonable response rate ...
... Operating systems must interleave the execution of a number of processes to maximize processor use – while providing reasonable response rate ...
2. OS Components
... code to a process for the process to detect and possibly correct. Another set of operating system functions exists not for helping the user but rather for ensuring the efficient operation of the system itself. Systems with multiple users can gain efficiency by sharing the computer resources among th ...
... code to a process for the process to detect and possibly correct. Another set of operating system functions exists not for helping the user but rather for ensuring the efficient operation of the system itself. Systems with multiple users can gain efficiency by sharing the computer resources among th ...
CENG334 Introduction to Operating Systems
... e.g., Access to unallocated memory address crashes only the program, not the whole system Segmentation fault – core dumped ...
... e.g., Access to unallocated memory address crashes only the program, not the whole system Segmentation fault – core dumped ...
Chapter 13: I/O Systems - FSU Computer Science
... Stream is a full-duplex communication channel between a user-level process and a device in Unix systems ...
... Stream is a full-duplex communication channel between a user-level process and a device in Unix systems ...
Architectural Support for Operating Systems
... • Your computer has a very simple program pre-loaded in a special read-only memory – The Basic Input/Output Subsystem, or BIOS ...
... • Your computer has a very simple program pre-loaded in a special read-only memory – The Basic Input/Output Subsystem, or BIOS ...
Architectural Support for Operating Systems
... • Your computer has a very simple program pre-loaded in a special read-only memory – The Basic Input/Output Subsystem, or BIOS ...
... • Your computer has a very simple program pre-loaded in a special read-only memory – The Basic Input/Output Subsystem, or BIOS ...
System
... to resources defined by the OS • Security – defense of the system against internal and external attacks – Huge range, including denial-of-service, worms, viruses, identity theft, theft of service ...
... to resources defined by the OS • Security – defense of the system against internal and external attacks – Huge range, including denial-of-service, worms, viruses, identity theft, theft of service ...
Memory Management
... Batch: Jobs are queued or ‘spooled’ waiting to be processed. Examples of Batch Processing: JCL: IBM's Job Control Language UNIX Shell Command File: List of commands are executed from a file Shell: Command interpreter processes each command (in file or at command prompt). Includes programming l ...
... Batch: Jobs are queued or ‘spooled’ waiting to be processed. Examples of Batch Processing: JCL: IBM's Job Control Language UNIX Shell Command File: List of commands are executed from a file Shell: Command interpreter processes each command (in file or at command prompt). Includes programming l ...
ppt - Dave Reed
... must at least provide process & memory management, communications communications between client programs and services via message passing e.g., client program & file server send messages through microkernel advantages: easier to extend a microkernel; easier to port the OS to new architectures; m ...
... must at least provide process & memory management, communications communications between client programs and services via message passing e.g., client program & file server send messages through microkernel advantages: easier to extend a microkernel; easier to port the OS to new architectures; m ...
Overview and History
... must at least provide process & memory management, communications communications between client programs and services via message passing e.g., client program & file server send messages through microkernel advantages: easier to extend a microkernel; easier to port the OS to new architectures; m ...
... must at least provide process & memory management, communications communications between client programs and services via message passing e.g., client program & file server send messages through microkernel advantages: easier to extend a microkernel; easier to port the OS to new architectures; m ...
The Mach System Abraham Silberschatz, Peter Baer Galvin, Greg
... Passes messages by moving memory pointers to shared memory objects where possible – avoids object copy Uses virtual memory re-mapping to transfer large messages – also known as virtual copy or copy-on-write. Memory management is based on the use of memory objects Memory objects may reside on remote ...
... Passes messages by moving memory pointers to shared memory objects where possible – avoids object copy Uses virtual memory re-mapping to transfer large messages – also known as virtual copy or copy-on-write. Memory management is based on the use of memory objects Memory objects may reside on remote ...
Chapter 21: The Linux System Objectives 21.1 History (不考) Linux 2.0
... The core Linux operating system kernel is entirely original, but it can run much existing free UNIX software, resulting in an entire UNIX-compatible operating system free from proprietary code ...
... The core Linux operating system kernel is entirely original, but it can run much existing free UNIX software, resulting in an entire UNIX-compatible operating system free from proprietary code ...
CPS 210 Course Intro - Duke Computer Science
... OS interfaces and policies depend on relative speed and cost of the different components. E.g., faster networks allow tighter coupling of clustered systems. ...
... OS interfaces and policies depend on relative speed and cost of the different components. E.g., faster networks allow tighter coupling of clustered systems. ...
Process Description and Control
... File Tables Existence of files Location on secondary memory Current Status (e.g., open) Attributes (e.g., permissions) Sometimes this information is maintained by a file-management system ...
... File Tables Existence of files Location on secondary memory Current Status (e.g., open) Attributes (e.g., permissions) Sometimes this information is maintained by a file-management system ...
Introduction
... hierarchy. In Unix, / is the root directory. • Each process has a current working directory (pwd). ...
... hierarchy. In Unix, / is the root directory. • Each process has a current working directory (pwd). ...