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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.
Q. Define Hyperlinks? Hyperlinks, or links are one of the most significant characteristics of web pages. A link moves us from current page to a destination which is specified i
To calculate speed up performance various laws have been developed. These laws are discussed here. Amdahl's Law Remember, the speed up factor helps us in knowing the relat
Firewalls use one or more of three methods to control traffic flowing in and out of the network: Packet filtering - Packets (small chunks of data) are examined against a s
Q. Evaluate Physical address of top of stack? Value of stack segment register (SS) = 6000h Value of stack pointer (SP) which is Offset = 0010h So Physical address of top
explain parallel database system
Locality of reference implies that the page reference being made by a process is Ans. Locality of reference means that the page reference being made through a process is proba
What are the Input devices Various devices are available for data input on graphics workstations. Most systems have a keyboard and one or more additional devices specially desi
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How would you kill a process? The "kill" command takes the PID as one argument; this signifies which process to terminate. The PID of a process can be got using "ps" command
Now we will learn how to compile and run PVM programs. To compile the program change to directory pvm/lib/archname where archname is architecture name of your computer. Then the su
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