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Operating System ระบบปฏิบัติการคอมพิวเตอร์ by Nuttha Otanasap (ณัฏฐ์ โอธนาทรัพย์) Computer Science Dept., South-east Asia University Bangkok 10160 Thailand email: auisuke@gmail.com website:auisuke auisuke.blogspot.com Hi5:auisuke.hi5.com Copyrights 2009 SE Asia University All Rights Reserved
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ระบบปฏิบัติการคอมพิวเตอร์
by Nuttha Otanasap (ณัฏฐ์ โอธนาทรัพย์)
Computer Science Dept.,
South-east Asia University
Bangkok 10160 Thailand
email: auisuke@gmail.com
website:auisuke
auisuke.blogspot.com
Hi5:auisuke.hi5.com
Copyrights 2009 SE Asia University All Rights Reserved
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Operating System
ระบบปฏิบัติการคอมพิวเตอร์
by Nuttha Otanasap (ณัฏฐ์ โอธนาทรัพย์)
Computer Science Dept.,
South-east Asia University
Bangkok 10160 Thailand
email: auisuke@gmail.com
website:auisuke
auisuke.blogspot.com
Hi5:auisuke.hi5.com
Copyrights 2009 SE Asia University All Rights Reserved
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ระบบปฏิบัติการคอมพิวเตอร์
by Nuttha Otanasap (ณัฏฐ์ โอธนาทรัพย์)
Computer Science Dept.,
South-east Asia University
Bangkok 10160 Thailand
email: auisuke@gmail.com
website:auisuke
auisuke.blogspot.com
Hi5:auisuke.hi5.com
Copyrights 2009 SE Asia University All Rights Reserved
Ch06th
Operating System
ระบบปฏิบัติการคอมพิวเตอร์
by Nuttha Otanasap (ณัฏฐ์ โอธนาทรัพย์)
Computer Science Dept.,
South-east Asia University
Bangkok 10160 Thailand
email: auisuke@gmail.com
website:auisuke
auisuke.blogspot.com
Hi5:auisuke.hi5.com
Copyrights 2009 SE Asia University All Rights Reserved
Ch08th
Operating System
ระบบปฏิบัติการคอมพิวเตอร์
by Nuttha Otanasap (ณัฏฐ์ โอธนาทรัพย์)
Computer Science Dept.,
South-east Asia University
Bangkok 10160 Thailand
email: auisuke@gmail.com
website:auisuke
auisuke.blogspot.com
Hi5:auisuke.hi5.com
Copyrights 2009 SE Asia University All Rights Reserved
แนวข้อสอบระบบปฎิบัติการคอมพิวเตอร์ Os
The document discusses operating systems and their components. It covers topics like the interface between software and hardware, different types of operating systems like batch OS and network OS, concepts like multiprogramming and time-sharing, languages used by operating systems like machine language and assembly language, components of an operating system like the kernel, memory manager and I/O system, examples of operating systems like Linux and Windows, and CPU states like running, ready, and blocked.
Linux Memory Management
Linux uses memory management to partition memory between kernel and application spaces, organize memory using virtual addresses, and swap memory between primary and secondary storage. It divides memory using paging into equal-sized pages, creates virtual address spaces, and uses an MMU to translate between virtual and physical addresses. This allows processes to run independently with their own logical view of memory while the physical memory is shared.
VIRTUAL MEMORY
Virtual memory allows programs to execute without requiring their entire address space to be resident in physical memory. It uses virtual addresses that are translated to physical addresses by the hardware. This translation occurs via page tables managed by the operating system. When a virtual address is accessed, its virtual page number is used as an index into the page table to obtain the corresponding physical page frame number. If the page is not in memory, a page fault occurs and the OS handles loading it from disk. Paging partitions both physical and virtual memory into fixed-sized pages to address fragmentation issues. Segmentation further partitions the virtual address space into logical segments. Hardware support for segmentation involves a segment table containing base/limit pairs for each segment. Translation lookaside buffers
Set model and page fault.44
The document discusses the working set model and page fault frequency in operating systems. The working set model defines the set of pages used by a process within a time window. It aims to approximate the program's locality to determine the optimal number of frames to allocate. Page fault frequency is a good indicator of thrashing, with higher frequency suggesting more frames should be allocated.
Understanding operating systems 5th ed ch03
The document discusses several topics related to memory management and virtual memory systems:
1) It describes different page allocation methods including paged, demand paging, segmented, and segmented demand paging and how they influence virtual memory systems.
2) It explains page replacement policies like first-in first-out, least recently used, and clock replacement and how they determine which pages to swap out of memory.
3) It discusses the concept of the working set and how it is used in memory allocation schemes to improve performance.
NAS Concepts
NAS (network-attached storage) allows clients to access files over a network. It uses file sharing protocols like NFS and CIFS to provide access to files stored on storage devices. NAS devices have benefits like centralized storage, simplified management, scalability, and security integration. They improve efficiency by allowing multiple servers and clients to access shared storage.
Memory Management
This document provides an overview of memory management techniques in operating systems, including both static and dynamic allocation approaches. It discusses fixed and variable partitioning for static allocation, as well as first-fit, next-fit, best-fit, and worst-fit algorithms for dynamic allocation. The document also covers fragmentation, base-limit registers, swapping, paging, and segmentation for virtual memory management. The key aspects of paging include using page tables to map virtual to physical addresses, allowing sharing and abstracting physical organization. Segmentation divides memory into logical segments specified by segment tables.
Virtual memory
The document discusses virtual memory and demand paging. It describes how virtual memory maps logical addresses to physical addresses using page tables and frames. On a page fault, the OS finds a free frame, loads the missing page, and updates the tables. It also covers page replacement algorithms like FIFO, LRU and their implementations. The document concludes with examples of Windows NT and Solaris virtual memory systems.
virtual memory
The document discusses the key concepts of virtual memory including hardware and software structures that support virtual memory like page tables, translation lookaside buffers, and paging/segmentation. It covers virtual memory techniques like demand paging, page replacement algorithms, and policies for page fetching, placement, cleaning, and load control that help improve system utilization and allow for more processes to reside efficiently in main memory than physically available memory.
Chapter 7 - Deadlocks
The Deadlock Problem
System Model
Deadlock Characterization
Methods for Handling Deadlocks
Deadlock Prevention
Deadlock Avoidance
Deadlock Detection
Recovery from Deadlock
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Ch08th
Operating System
ระบบปฏิบัติการคอมพิวเตอร์
by Nuttha Otanasap (ณัฏฐ์ โอธนาทรัพย์)
Computer Science Dept.,
South-east Asia University
Bangkok 10160 Thailand
email: auisuke@gmail.com
website:auisuke
auisuke.blogspot.com
Hi5:auisuke.hi5.com
Copyrights 2009 SE Asia University All Rights Reserved
แนวข้อสอบระบบปฎิบัติการคอมพิวเตอร์ Os
The document discusses operating systems and their components. It covers topics like the interface between software and hardware, different types of operating systems like batch OS and network OS, concepts like multiprogramming and time-sharing, languages used by operating systems like machine language and assembly language, components of an operating system like the kernel, memory manager and I/O system, examples of operating systems like Linux and Windows, and CPU states like running, ready, and blocked.
Linux Memory Management
Linux uses memory management to partition memory between kernel and application spaces, organize memory using virtual addresses, and swap memory between primary and secondary storage. It divides memory using paging into equal-sized pages, creates virtual address spaces, and uses an MMU to translate between virtual and physical addresses. This allows processes to run independently with their own logical view of memory while the physical memory is shared.
VIRTUAL MEMORY
Virtual memory allows programs to execute without requiring their entire address space to be resident in physical memory. It uses virtual addresses that are translated to physical addresses by the hardware. This translation occurs via page tables managed by the operating system. When a virtual address is accessed, its virtual page number is used as an index into the page table to obtain the corresponding physical page frame number. If the page is not in memory, a page fault occurs and the OS handles loading it from disk. Paging partitions both physical and virtual memory into fixed-sized pages to address fragmentation issues. Segmentation further partitions the virtual address space into logical segments. Hardware support for segmentation involves a segment table containing base/limit pairs for each segment. Translation lookaside buffers
Set model and page fault.44
The document discusses the working set model and page fault frequency in operating systems. The working set model defines the set of pages used by a process within a time window. It aims to approximate the program's locality to determine the optimal number of frames to allocate. Page fault frequency is a good indicator of thrashing, with higher frequency suggesting more frames should be allocated.
Understanding operating systems 5th ed ch03
The document discusses several topics related to memory management and virtual memory systems:
1) It describes different page allocation methods including paged, demand paging, segmented, and segmented demand paging and how they influence virtual memory systems.
2) It explains page replacement policies like first-in first-out, least recently used, and clock replacement and how they determine which pages to swap out of memory.
3) It discusses the concept of the working set and how it is used in memory allocation schemes to improve performance.
NAS Concepts
NAS (network-attached storage) allows clients to access files over a network. It uses file sharing protocols like NFS and CIFS to provide access to files stored on storage devices. NAS devices have benefits like centralized storage, simplified management, scalability, and security integration. They improve efficiency by allowing multiple servers and clients to access shared storage.
Memory Management
This document provides an overview of memory management techniques in operating systems, including both static and dynamic allocation approaches. It discusses fixed and variable partitioning for static allocation, as well as first-fit, next-fit, best-fit, and worst-fit algorithms for dynamic allocation. The document also covers fragmentation, base-limit registers, swapping, paging, and segmentation for virtual memory management. The key aspects of paging include using page tables to map virtual to physical addresses, allowing sharing and abstracting physical organization. Segmentation divides memory into logical segments specified by segment tables.
Virtual memory
The document discusses virtual memory and demand paging. It describes how virtual memory maps logical addresses to physical addresses using page tables and frames. On a page fault, the OS finds a free frame, loads the missing page, and updates the tables. It also covers page replacement algorithms like FIFO, LRU and their implementations. The document concludes with examples of Windows NT and Solaris virtual memory systems.
virtual memory
The document discusses the key concepts of virtual memory including hardware and software structures that support virtual memory like page tables, translation lookaside buffers, and paging/segmentation. It covers virtual memory techniques like demand paging, page replacement algorithms, and policies for page fetching, placement, cleaning, and load control that help improve system utilization and allow for more processes to reside efficiently in main memory than physically available memory.
Chapter 7 - Deadlocks
The Deadlock Problem
System Model
Deadlock Characterization
Methods for Handling Deadlocks
Deadlock Prevention
Deadlock Avoidance
Deadlock Detection
Recovery from Deadlock
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