Скачать или смотреть (Part-5.29) Virtual Memory | OS বাংলা টিউটোরিয়াল

In this video, we explore the concept of virtual memory in operating systems. Virtual memory allows computers to compensate for physical memory limitations by using disk space, enabling more efficient multitasking and memory management.

📌 Key Topics Covered:

What is virtual memory?
How virtual memory extends RAM
Paging and swapping: Key mechanisms of virtual memory
Benefits and drawbacks of using virtual memory
Real-world examples of virtual memory in modern operating systems
If you're a computer science student, programmer, or tech enthusiast, this video will give you a clear understanding of how virtual memory works and its role in improving system performance.

🔔 Subscribe for more OS concepts, tech tutorials, and system architecture insights!

---------------------------------------------
#Chapter5
#MemoryManagement
#VirtualMemory
Virtual Memory is a storage allocation scheme in which secondary memory can be addressed as though it were part of main memory. The addresses a program may use to reference memory are distinguished from the addresses the memory system uses to identify physical storage sites, and program generated addresses are translated automatically to the corresponding machine addresses.
The size of virtual storage is limited by the addressing scheme of the computer system and amount of secondary memory is available not by the actual number of the main storage locations.

It is a technique that is implemented using both hardware and software. It maps memory addresses used by a program, called virtual addresses, into physical addresses in computer memory.

All memory references within a process are logical addresses that are dynamically translated into physical addresses at run time. This means that a process can be swapped in and out of main memory such that it occupies different places in main memory at different times during the course of execution.
A process may be broken into number of pieces and these pieces need not be continuously located in the main memory during execution. The combination of dynamic run-time address translation and use of page or segment table permits this.
If these characteristics are present then, it is not necessary that all the pages or segments are present in the main memory during execution. This means that the required pages need to be loaded into memory whenever required. Virtual memory is implemented using Demand Paging or Demand Segmentation.




#DemandPaging :
The process of loading the page into memory on demand (whenever page fault occurs) is known as demand paging.
The process includes the following steps :
If CPU try to refer a page that is currently not available in the main memory, it generates an interrupt indicating memory access fault.
The OS puts the interrupted process in a blocking state. For the execution to proceed the OS must bring the required page into the memory.
The OS will search for the required page in the logical address space.
The required page will be brought from logical address space to physical address space. The page replacement algorithms are used for the decision making of replacing the page in physical address space.
The page table will updated accordingly.
The signal will be sent to the CPU to continue the program execution and it will place the process back into ready state.

#OperatingSystem #OS #asadnomanee #banglalecture #CSE
#Lecturelia #MBSTU #MBSTU_CSE
#lecturelia #banglatutorial #bangla