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Memory Management

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Memory management is basically managing computer memory. The memory needs to provide ways to allocate portions of the memory for programs to access which is very important for the computer. Memory management requirements, consists of relocating, protection, sharing, and the logical and physical organization of programs or devices that the computer uses. The multiprogramming system memory is separated in to smaller processes to receive multiple processes. Memory management is important for a multiprogramming system. If the processor will only allow one program to process, then the rest of the programs will be waiting. So to utilize the processor speed and time, the memory will need to allocate a reasonable supply of readiness from the processor. So for the first requirement of memory management is relocation. Basically, the “end-user” will not know where the program will be placed in the memory. When the “end-user” opens a program, the program might be swapped to a disk and returned to the main memory but in a different location. The next requirement would be protection. When a program is being executed, the processor will allow the current program to be executed without the other programs interfering and would need to wait for permission to be executed. The protection requirement needs to be satisfied b the processor itself and not the operating system. The third requirement in memory management is sharing. Sharing allows several processes to access the same portion of memory and let each of the process be accessible to the same copy of the program instead of having access to a separate copy. The next requirement is the logical organization. Both main and secondary memory are organized in a linear address space made up of bytes. The programs are written in modules and can be arranged separately. The programs can also have different types of protection like a read-only or execute-only and can also be shared among processes. The last requirement for memory management is the physical organization. The physical memory is left with the programmer. However, the data may be insufficient because of the modules being assigned to the same section of the memory. Unlike the logical organization, in the physical organization the programmer does not know how much space will be available.

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