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In a memory hierarchy system, data and programs are first stored in secondary or auxiliary memory. Program and its related data are brought in main memory for execution. What if the size of Memory needed for Program is more than the size of memory? Virtual memory is a idea used in some large computer systems which allow user to construct programs as though a large memory space were available, equal to total of secondary memory. Every address produced by CPU goes through an address mapping from so-called virtual address to a physical address in main memory. Virtual memory is employed to give programmers the illusion that they have a very large memory at their disposal although computer in fact has a relatively small main memory. A Virtual memory system offers a mechanism for translating program-generated addresses in correct main memory locations. This is done dynamically whereas programs are being executed in CPU. The translation or mapping is handled automatically by hardware through a mapping table.
Define Mapping and List mapping procedure? The transformation of data from main memory to cache memory is known as an Mapping. Associative mapping Direct mapping
Objectives After going through this unit, you should be able to: Describe the diffrent criteria on which classification of parallel computers are based; Examine the
Define MFC. To accommodate the variability in response time, the processor waits unless it receives an indication that the requested read operation has been done. The control s
Links and Association Links and associations are the basic means used for establishing relationships among objects and classes of the system. In the next subsection we will di
When web pages containing emails are sent out they are prefixed by MIME Header. Why? Primarily email consisted messages having simple text written into English and expressed in
1. Click Tools > General Options, and then click the Object Mapping tab. 2. From the Object type list, select the standard object type that is associated with the object class
Q. Explain about Hybrid model? Hybrid models are normally tailor-made models suiting to particular applications. In fact these fall in category of mixed models. These type of a
The most useful feature of an expert system is the high level expertise it provides to aid in problem solving. This expertise can represent the best thinking of the top
Q. Illustrate LCD Technology? The technology behind LCD is known as Nematic Technology since the molecules of liquid crystals used are nematic which implies that rod-shaped. Th
Q. Total number of registers in a CPU? Factors to consider when choosing total number of registers in a CPU are: CPU can access registers faster than it can access m
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