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Virtual Memory provides an illusion of unlimited memory being available to the Processes/ Programmers. In a VM implementation, a process looks at the resources with a logical view and the CPU looks at it from a Physical or real view of resources.
What is Virtual Memory - Learn about virtual memory in computer organization architecture or coa, advantages of virtual memory, configuration of virtual memory, logical and physical address space with proper diagram.
Jun 26, 2024 · Virtual memory is a memory management technique used by operating systems to give the appearance of a large, continuous block of memory to applications, even if the physical memory (RAM) is limited. It allows the system to compensate for physical memory shortages, enabling larger applications to run on systems with less RAM.
Virtual memory is an integral part of a modern computer architecture; implementations usually require hardware support, typically in the form of a memory management unit built into the CPU. While not necessary, emulators and virtual machines can employ hardware support to increase performance of their virtual memory implementations. [6] .
RISC-V defines three different virtual memory specifications o Sv32: Two level hierarchy, 32-bit virtual, 34-bit physical address o Sv39: Three level, 39-bit virtual, 56-bit physical address
Virtual memory, apart from overcoming the main memory size limitation, allows sharing of main memory among processes. Thus, the virtual memory model provides decoupling of addresses used by the program (virtual) and the memory addresses (physical).
In other words, if our working set of memory accesses fit in main memory, our virtual memory system should make that possible, avoiding unnecessary collisions between accesses to one block of data and another.
