Literatur Computer Systeme und Anwendungen Informatics 3
... changed the running application program can remain unchanged. The application programs can be programmed as if there was a large continuous RAM (memory) but may be only part of the program and the data are stored in the real main memory. From the programming point of view it seems as if each running ...
... changed the running application program can remain unchanged. The application programs can be programmed as if there was a large continuous RAM (memory) but may be only part of the program and the data are stored in the real main memory. From the programming point of view it seems as if each running ...
ppt
... Disk controller: which cylinder? Move disk arm, Wait until proper sector rotates under head, and then read disk content to its buffer When data is ready (stored in disk controller’s buffer), they are transferred from disk controller’s register to main memory Your program is ready to run again… ...
... Disk controller: which cylinder? Move disk arm, Wait until proper sector rotates under head, and then read disk content to its buffer When data is ready (stored in disk controller’s buffer), they are transferred from disk controller’s register to main memory Your program is ready to run again… ...
memory
... A demand paging system is a paging system with swapping. When we want to execute a process, we swap it into memory. Rather than swapping the entire process into memory, however, it is used a swapper (called pager). ...
... A demand paging system is a paging system with swapping. When we want to execute a process, we swap it into memory. Rather than swapping the entire process into memory, however, it is used a swapper (called pager). ...
hello
... Local secondary storage (local disks) Local disks hold files retrieved from disks on remote network servers. ...
... Local secondary storage (local disks) Local disks hold files retrieved from disks on remote network servers. ...
Chapter 2.pdf
... terminals, with the OS interleaving the execution of each user program in a short burst or quantum of computation ...
... terminals, with the OS interleaving the execution of each user program in a short burst or quantum of computation ...
The Contiki Operating System
... are kept separate in ROM. Program Code loaded at runtime. Program code can be loaded from ROM or RAM Allows for “Over the Air Programming” for networks of sensors ...
... are kept separate in ROM. Program Code loaded at runtime. Program code can be loaded from ROM or RAM Allows for “Over the Air Programming” for networks of sensors ...
Basic Functions of the operating system
... • The OS uses the active partition to do what? – Boot the system ...
... • The OS uses the active partition to do what? – Boot the system ...
Week 2 _Operating system File
... The layers are selected so that each uses functions and services of only lower-level layers. The first layer can be debugged without any concern for the rest of the system. If an error is found during the debugging of a particular layer, the error must be on that layer. ...
... The layers are selected so that each uses functions and services of only lower-level layers. The first layer can be debugged without any concern for the rest of the system. If an error is found during the debugging of a particular layer, the error must be on that layer. ...
Computer Science 4302 - Angelo State University
... The student will explore the classic internal algorithms and structures of storage management and will learn a firm practical understanding of the algorithms used, their properties, advantages, and disadvantages. The student will be introduced to secondary and tertiary storage, and the student will ...
... The student will explore the classic internal algorithms and structures of storage management and will learn a firm practical understanding of the algorithms used, their properties, advantages, and disadvantages. The student will be introduced to secondary and tertiary storage, and the student will ...
Operating Systems I Supervision Exercises
... (ii ) For two concurrently-running instances of the same program, each with code, data, heap and stack segments, which segments might benefit from copy-on-write? In what circumstances, if any, could these instead be shared read-only? ...
... (ii ) For two concurrently-running instances of the same program, each with code, data, heap and stack segments, which segments might benefit from copy-on-write? In what circumstances, if any, could these instead be shared read-only? ...
Last Class: Memory Management Recap: Paging
... are in main memory with a TLB (faster but limits the number of segments a program can have) – Both the segment tables and page tables can be in main memory with the segment index and page index combined used in the TLB lookup (slower but no restrictions on the number of segments per program) ...
... are in main memory with a TLB (faster but limits the number of segments a program can have) – Both the segment tables and page tables can be in main memory with the segment index and page index combined used in the TLB lookup (slower but no restrictions on the number of segments per program) ...
- jGyan.com
... ▫ User ID then associated with all files, processes of that user to determine access control ▫ 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 right ...
... ▫ User ID then associated with all files, processes of that user to determine access control ▫ 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 right ...
Operating system - Department of Computer Science
... z CPU is multiplexed among several jobs of several users that are kept in memory CPU is allocated to jobs in Round-Robin manner All active users must have a fair share of the CPU time: e.g. with 100 ms time quantum ...
... z CPU is multiplexed among several jobs of several users that are kept in memory CPU is allocated to jobs in Round-Robin manner All active users must have a fair share of the CPU time: e.g. with 100 ms time quantum ...
Lecture 12: Protection: Kernel and Address Spaces 12.0 Main Points
... How does the user program get back into the kernel? Voluntarily user->kernel: System call -- special instruction to jump to a specific operating system handler. Just like doing a procedure call into the operating system kernel -- program asks OS kernel, please do something on procedure's behalf. Can ...
... How does the user program get back into the kernel? Voluntarily user->kernel: System call -- special instruction to jump to a specific operating system handler. Just like doing a procedure call into the operating system kernel -- program asks OS kernel, please do something on procedure's behalf. Can ...
Disco
... • Virtual physical memory is done in Disco by catching TLB misses. However, this only applies to the MIPS architecture. Nearly all other architectures use hardware loaded TLB. The paper doesn't propose a way to provide virtual physical memory without the ability to catch TLB misses, which is often t ...
... • Virtual physical memory is done in Disco by catching TLB misses. However, this only applies to the MIPS architecture. Nearly all other architectures use hardware loaded TLB. The paper doesn't propose a way to provide virtual physical memory without the ability to catch TLB misses, which is often t ...
ships with the operating system
... Memory Management All instructions in memory in order to execute All data in memory before and after processing ...
... Memory Management All instructions in memory in order to execute All data in memory before and after processing ...
lecture2
... Resource allocation - When multiple users or multiple jobs running concurrently, resources must be allocated to each of them ...
... Resource allocation - When multiple users or multiple jobs running concurrently, resources must be allocated to each of them ...
Chapter 8 Virtual Memory
... Each process has its own page table each page table entry contains the frame number of the corresponding page in main memory ...
... Each process has its own page table each page table entry contains the frame number of the corresponding page in main memory ...
Slide 11 : Uniprocessor Scheduling
... their complexity, their characteristic time scale, and their level of abstraction ...
... their complexity, their characteristic time scale, and their level of abstraction ...
Overview of OS/2
... Each file system supports the management of file system objects, such as files and directories, in a hierarchical fashion. File system objects and devices are managed and accessed by processes using a common file system API. Since the file system API is not sensitive to any of the file system naming ...
... Each file system supports the management of file system objects, such as files and directories, in a hierarchical fashion. File system objects and devices are managed and accessed by processes using a common file system API. Since the file system API is not sensitive to any of the file system naming ...
Background - The University of Alabama in Huntsville
... • A stand-alone computer system with the following characteristics: – two or more similar processors of comparable capability – processors share the same main memory and are interconnected by a bus or other internal connection scheme – processors share access to I/O devices – all processors can perf ...
... • A stand-alone computer system with the following characteristics: – two or more similar processors of comparable capability – processors share the same main memory and are interconnected by a bus or other internal connection scheme – processors share access to I/O devices – all processors can perf ...
資工系網媒所NEWS實驗室Chapter 2
... Resource allocation - When multiple users or multiple jobs running concurrently, resources must be allocated to each of them Many types of resources - Some (such as CPU cycles,mainmemory, and file storage) may have special allocation code, others (such as I/O devices) may have general request and re ...
... Resource allocation - When multiple users or multiple jobs running concurrently, resources must be allocated to each of them Many types of resources - Some (such as CPU cycles,mainmemory, and file storage) may have special allocation code, others (such as I/O devices) may have general request and re ...
System Call - ShareCourse
... Resource allocation - When multiple users or multiple jobs running concurrently, resources must be allocated to each of them Many types of resources ...
... Resource allocation - When multiple users or multiple jobs running concurrently, resources must be allocated to each of them Many types of resources ...
Introduction
... Interrupt-driven I/O is fine for moving small data but is high overhead for bulk data movement such as disk I/O. Direct memory access (DMA) controller is used. It transfers a block of data directly to/from its buffer to memory, with no CPU intervention. Only one interrupt per block, telling the driv ...
... Interrupt-driven I/O is fine for moving small data but is high overhead for bulk data movement such as disk I/O. Direct memory access (DMA) controller is used. It transfers a block of data directly to/from its buffer to memory, with no CPU intervention. Only one interrupt per block, telling the driv ...
OS Services #1 File
... the operating-system design. One approach is for the program to ask the user for the names of the two files. In an interactive system, this approach will require a sequence of system calls, first to write a prompting message on the screen, and then to read from the keyboard the characters that defin ...
... the operating-system design. One approach is for the program to ask the user for the names of the two files. In an interactive system, this approach will require a sequence of system calls, first to write a prompting message on the screen, and then to read from the keyboard the characters that defin ...