Operating Systems
... – e.g. DOS, Windows, Win 95/98, . . . • RT Systems: power is nothing without control. – hard-real time: nuclear reactor safety monitor. – soft-real time: mp3 player. • Parallel Processing: the need for speed. – SMP: 2–8 processors in a box. ...
... – e.g. DOS, Windows, Win 95/98, . . . • RT Systems: power is nothing without control. – hard-real time: nuclear reactor safety monitor. – soft-real time: mp3 player. • Parallel Processing: the need for speed. – SMP: 2–8 processors in a box. ...
Processes
... • First homework is due this Wednesday by midnight • First CS 415 project is up • Contact Bill Hogan ([email protected]) by 3:30 if you don’t have CSUGLab account or are not able to get to CMS ...
... • First homework is due this Wednesday by midnight • First CS 415 project is up • Contact Bill Hogan ([email protected]) by 3:30 if you don’t have CSUGLab account or are not able to get to CMS ...
Memory Mapped Files
... files especially in Read mode. The content of the file is accessed without going through system calls for each read operation. Useful in accessing files that are larger than physical RAM size – and results in lazy-loading (the parts of the file that need loading are only loaded when needed). Mem ...
... files especially in Read mode. The content of the file is accessed without going through system calls for each read operation. Useful in accessing files that are larger than physical RAM size – and results in lazy-loading (the parts of the file that need loading are only loaded when needed). Mem ...
lecture3
... spaces, there are times when you need processes to share memory. For example there could be several processes in the system running the bash command shell. Rather than have several copies of bash, one in each process's virtual address space, it is better to have only one copy in physical memory and ...
... spaces, there are times when you need processes to share memory. For example there could be several processes in the system running the bash command shell. Rather than have several copies of bash, one in each process's virtual address space, it is better to have only one copy in physical memory and ...
OS - Deyes High School
... Swapping programs around takes time. If it is done too often then the system will slow down as too much time will be spent doing the swap! If programs are not swapped often enough then the user will notice “freezes” where the screen stops responding. This is when the running program is waiting for C ...
... Swapping programs around takes time. If it is done too often then the system will slow down as too much time will be spent doing the swap! If programs are not swapped often enough then the user will notice “freezes” where the screen stops responding. This is when the running program is waiting for C ...
Operating system
... Group identifier (group ID) allows set of users to be defined and controls managed, then also associated with each process, file Privilege escalation allows user to change to effective ID with more rights, such as setuid ...
... Group identifier (group ID) allows set of users to be defined and controls managed, then also associated with each process, file Privilege escalation allows user to change to effective ID with more rights, such as setuid ...
process
... – shared memory - OS provides mechanisms that allow creation of a shared memory buffer between processes • shmget() creates a shared memory segment, using a name (key ID) • shmctl() to modify control information and permissions related to a shared memory segment • shmat() to attach a shared memory s ...
... – shared memory - OS provides mechanisms that allow creation of a shared memory buffer between processes • shmget() creates a shared memory segment, using a name (key ID) • shmctl() to modify control information and permissions related to a shared memory segment • shmat() to attach a shared memory s ...
CS 519 -- Operating Systems -
... swaps the position of A and B in the LRU list and places B in a “placeholder” which points to A (kernel’s choice) If the user process misses on B (i.e. it made a bad choice), and B is found in the placeholder, then the block pointed to by the ...
... swaps the position of A and B in the LRU list and places B in a “placeholder” which points to A (kernel’s choice) If the user process misses on B (i.e. it made a bad choice), and B is found in the placeholder, then the block pointed to by the ...
An Introduction to MS-DOS
... The original Expanded Memory specification (EMS) was designed to provide a uniform means for applications running on 8086/8088 personal computers or 80286/80386- based computers in real mode, to circumvent the 1MB limit on conventional memory, thus providing such programs with very larger amounts of ...
... The original Expanded Memory specification (EMS) was designed to provide a uniform means for applications running on 8086/8088 personal computers or 80286/80386- based computers in real mode, to circumvent the 1MB limit on conventional memory, thus providing such programs with very larger amounts of ...
What is an Operating System?
... • Distribute the computation among several physical processors. • Loosely coupled system – involves connecting 2 or more independent computer systems via communication link. So, each processor has its own O.S. and local memory; processors communicate with one another through various communications l ...
... • Distribute the computation among several physical processors. • Loosely coupled system – involves connecting 2 or more independent computer systems via communication link. So, each processor has its own O.S. and local memory; processors communicate with one another through various communications l ...
What is an Operating System?
... Time-Sharing Systems Personal-Computer Systems Parallel Systems Distributed Systems Real -Time Systems ...
... Time-Sharing Systems Personal-Computer Systems Parallel Systems Distributed Systems Real -Time Systems ...
CrossOver Compared to Competing Emulation
... Dual-booting, of course, is the least convenient solution in that it entails losses of time and convenience associated with shutdowns and reboots, as well as moving files from one environment to the next. To a lesser extent, one of the practical outcomes of an emulator approach is that the emulator ...
... Dual-booting, of course, is the least convenient solution in that it entails losses of time and convenience associated with shutdowns and reboots, as well as moving files from one environment to the next. To a lesser extent, one of the practical outcomes of an emulator approach is that the emulator ...
μ-kernels Advantages Disadvantages Primitives in a μ
... What is the page protection strategic? • E.g. modern CPUs demand an explicit bit protection setting command from the kernel, before the kernel will be allowed to modify a write protected page. The very old 386 would do anything in kernel mode. ...
... What is the page protection strategic? • E.g. modern CPUs demand an explicit bit protection setting command from the kernel, before the kernel will be allowed to modify a write protected page. The very old 386 would do anything in kernel mode. ...
CT213 – Memory Management
... – Memory needs to be allocated efficiently to pack as many processes into memory as possible ...
... – Memory needs to be allocated efficiently to pack as many processes into memory as possible ...
Lecture7
... of a file or file-like resource. This resource could be a file physically present on-disk, or a device, shared memory object, or other resource that the OS can reference through a file descriptor. Memory-mapped I/O uses the same address bus to address both memory and I/O devices, and the CPU instruc ...
... of a file or file-like resource. This resource could be a file physically present on-disk, or a device, shared memory object, or other resource that the OS can reference through a file descriptor. Memory-mapped I/O uses the same address bus to address both memory and I/O devices, and the CPU instruc ...
theGuard! ApplicationManager System Windows Data
... A number of data collectors have been developed for theGuard! ApplicationManager that provide comprehensive monitoring and generate detailed data analyses. Data collectors do more than simply collect events according to pre-defined rules. They deliver every performance value and the current status o ...
... A number of data collectors have been developed for theGuard! ApplicationManager that provide comprehensive monitoring and generate detailed data analyses. Data collectors do more than simply collect events according to pre-defined rules. They deliver every performance value and the current status o ...
• Chapter 1: Introduction
... • Distribute the computation among several physical processors. • Loosely coupled system – involves connecting 2 or more independent computer systems via communication link. So, each processor has its own O.S. and local memory; processors communicate with one another through various communications l ...
... • Distribute the computation among several physical processors. • Loosely coupled system – involves connecting 2 or more independent computer systems via communication link. So, each processor has its own O.S. and local memory; processors communicate with one another through various communications l ...
Module 3 – Operating Systems
... • Memory references are mapped to physical addresses through table lookups and address calculations ...
... • Memory references are mapped to physical addresses through table lookups and address calculations ...
Systems Architecture, Fifth Edition
... • Memory references are mapped to physical addresses through table lookups and address calculations ...
... • Memory references are mapped to physical addresses through table lookups and address calculations ...
ppt
... + Fixed length units allow efficient memory management. Paging is not a good basis for access control as pages are not logical units. One page may contain objects requiring different protection. Page faults can create a covert channel. Chapter 6: 32 ...
... + Fixed length units allow efficient memory management. Paging is not a good basis for access control as pages are not logical units. One page may contain objects requiring different protection. Page faults can create a covert channel. Chapter 6: 32 ...
Operating system organization - cs.rochester.edu
... After I/O starts, control returns to user program without waiting for I/O completion. Device controller later informs CPU that it has finished its operation by causing an interrupt. When an interrupt occur, current execution is put on hold; the CPU jumps to a service routine called “interrupt handle ...
... After I/O starts, control returns to user program without waiting for I/O completion. Device controller later informs CPU that it has finished its operation by causing an interrupt. When an interrupt occur, current execution is put on hold; the CPU jumps to a service routine called “interrupt handle ...
Operating Systems
... Basic concepts Various techniques for memory management Logical to physical address translation Swapping Contiguous memory allocation: MFT, MVT External fragmentation Paging Hardware support for paging Internal fragmentation © Copyright Virtual University of ...
... Basic concepts Various techniques for memory management Logical to physical address translation Swapping Contiguous memory allocation: MFT, MVT External fragmentation Paging Hardware support for paging Internal fragmentation © Copyright Virtual University of ...
operating systems
... e. Communications: One process might need to exchange information with another process. Such communication may occur between processes that are executing on the same computer or between processes that are executing on different computer systems tied together by a computer network. Communications may ...
... e. Communications: One process might need to exchange information with another process. Such communication may occur between processes that are executing on the same computer or between processes that are executing on different computer systems tied together by a computer network. Communications may ...
page table - Parent Directory
... Any process whose size is less than or equal to the partition size can be loaded into an available partition. If all partitions are full, the operating system can swap a process out of a partition Main memory use is inefficient. Any program, no matter how small, occupies an entire partition: interna ...
... Any process whose size is less than or equal to the partition size can be loaded into an available partition. If all partitions are full, the operating system can swap a process out of a partition Main memory use is inefficient. Any program, no matter how small, occupies an entire partition: interna ...