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In order to free up space in memory, an operating system with a virtual memory capability transfers data that is not immediately needed from memory to the HDD; when that data is needed again, it is copied back into memory. That is, when all of the RAM is being used (e.g., if there are many programs open simultaneously or if one very large program is in use), a computer with virtual memory enabled will swap data to the HDD and back to memory as needed, thus, in effect, increasing the total system memory.
What else can I help you with?
What type of memory is used by most computers when the amount of RAM needed exceeds the RAM available?
That would be virtual memory. Its when your the excess data is stored on your harddrive. A section of your harddrive is reserved for this purpose. Though virtual memory isn't as fast as normal RAM.
What is the virtual memeory how to increase the virtual memory?
Virtual memory is space on your hard-drive that holds information about active programs but is not currently needed and thus would just be taking up space in RAM. You can change how much virtual memory you have but to assist you on that I would need to know what OS you are running.
What is responsible for managing memory virtual machines and all the resources needed by each application?
the VMM
When is the need for increasing the virtual memory?
virtual memory acts as additional memory to support ur ram when it runs out of the required memory needed by program. it is taken up from the hard drive u specify and when it is needed it is used. u can also change the size of virtual memory in ur PC, bt most of the time it is automatically done by the os in order to maintain the performance of the machine.
What are the differences between simple paging and virtual memory paging?
In case of simple paging all pages should be in main memory to run a process..while in case of virtual memory paging pages can be loaded as needed by the processor i.e. called demand paging...
Is a virtual memory a special chip inside the hard disk?
No.Virtual memory is a file stored on the disk and managed by the operating system software. As needed the operating system copies blocks of internal memory out to this file to free internal memory and copies blocks from this file to internal memory when a program needs it again. To assist the operating system in this task the computer has to have virtual memory management hardware and interrupts.All of the hardware that is involved directly in the operation of virtual memory is part of the computer, not the harddisk.
Why temporary memory is required for computer even though permanent is available?
Temporary memory is used to store program and applications that are being used at the time and allows for computing to be much faster. After the program closes the memory is no longer needed. there are two types RAM and Virtual Memory. RAM is a separate card and stands for Random Access Memory. Virtual Memory is space reserved on the Hard drive for the same purpose. By far the most efficient type is RAM as it is much faster than Virtual Memory and doesn't take Hard drive space al though for a modern computer both are needed for efficient performance.
What is paging in an operating system?
Paging in an operating system is part of the operation of virtual memory. Physical pages of memory are being swapped back and forth for virtual pages of memory in a file on the hard disk. This swapping allows all programs to see the same memory structure (e.g. program loads at the same fixed virtual address in memory) and allows the machine to run as if it had more memory than it really does (but at a small speed penalty). Programs and utilities that are idle may stay loaded and ready to run, but paged out of physical memory until actually needed.
How virtual memory work?
virtual memory is a memory management technique which applied when memory available to the programs being greater than the amount of RAM on the computer on which they are running. HOW CAN BE APPLIED? ...A program can be divided into segment. ...segment loaded into RAM by operating system when needed. ... Un used segment stay on secondary storage. ...reduces amount of RAM required. ...allow bigger programs to be written.
Explain how it is possible that two programs that are together are much larger than a physical memory can both be executed in a virtual memory?
In a virtual memory system applications are not directly loaded into physical memory. Every process is assigned a virtual and private address space of 2GB. When an application is loaded it is mapped into this virtual space. When the application runs the code is copied from disk to RAM only when it is needed. Most applications contain code that is rarely accessd and there is no need or benefit in having this in RAM all the time. After code has been copied to RAM it will be retained for future use, often even after the application has closed. If this memory is needed for more importan uses it is immediately available as the data it contains can be reloaded from disk if needed. Using this method only frequently accessed data is in memory with the remainder kept on disk. This entire process is handled by the system and is totally transparent to applications. Note: When aplication code must be released from memory it is NOT copied to the pagefile as many uninformed sources have claimed. There is no need for this as this code is hardley ever modified and can simply be reloaded from the original files. Only data that has been modified is copied to the pagefile.
Why add more RAM to my computer?
What is virtual memory? We know that computer stores all the data needed for processing in the RAM. But the RAM has a limit. So when your RAM is full, the computer automatically starts writing information on the hard disk. This utilization of hard disk space in place of real memory is called virtual memory. But, by virtual memory, the computer becomes slow as it takes much longer time to retrieve data from Harddisk. So by adding more RAM you get away from the condition where your computer has to go for Virtual Memory and the speed of the computer is maintained.
How does virtual memory differ from main memory and secondary memory?
The computer uses microchips for primary and secondary memory. Virtual memory uses a portion of the computers hard drive. The former have faster access times than the latter.
