In computing, virtual memory is a mechanism that simulates the presence of a type of memory using another type. It is used, for example, to simulate the presence of memory using the mass memory.
Use
For economic reasons, briefs are usually divided into several families treated, most of the time, unlike the operating1 system. In order of increasing cost, we can distinguish the following.
A mass memory or storage memory is used to store long-term large amounts of information. The most common mass storage technologies are electromechanical, they aim to get a high capacity, low-cost storage and are generally lower than other memory speed. RAM is the main storage, the content disappears from turning off the computer.
A cache is used to store a short time frequently accessed information. Technologies caches are designed to accelerate the speed of operations consultation. They have a very high speed and a high cost for a small storage capacity. The processor register is integrated in the processor. This type of memory is very fast but also very expensive and is reserved for a very small amount of data.
Nonvolatile memory
A nonvolatile memory called when the temporary system shutdown does not destroy the contents, as in the case of mobile phones or radios. This memory is not always managed as a system file and is sometimes included in the same logic as the memory space. For example, some operating systems such as OpenVMS VAX-11/VMS or offer virtual address called VMS, in which the hard drives appear as RAM and can be handled by Computer Services in Wagga Wagga.
The ROM provides invariable data. Formerly, the ROMs contained comprehensive programs ready for a two lightning start. With the rapid evolution of technology, only just enough to start minimalist system BIOS and UEFI was maintained.
A parallel computer has several computing units. According to its construction can be equipped with a single unit of memory used in common by all units of computation as it is the shared memory. Or each computing unit is equipped with its own memory unit, a construction known to distribute memory.
Devices
Palm computers, or PDAs (Personal Digital Assistants), because they fit in the palm of the hand, were originally designed as personal organizers, which makes them very efficient. The basic features of a PDA are a calendar, address book, task list and memo pad, but with the rise of the new processors and software availability there are now enhanced web applications, games and almost any other application’s own a desktop computer.
Although these features are very helpful in assisting any person stay organized, the feature that spread its use for any busy person who uses a desktop is the easy synchronization of information with a desktop computer.
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