So, excess process are kept on disk and brought in to run dynamically. But sometimes there is not enough main memory to hold all the currently active processes in a time-sharing system. This mechanism is known as Dynamic Linking.Ī process needs to be in memory for execution. In such a case, rather than loading all the dependent programs, CPU links the dependent programs to the main executing program when its required. Sometimes complete program is loaded into the memory, but some times a certain part or routine of the program is loaded into the main memory only when it is called by the program, this mechanism is called Dynamic Loading, this enhance the performance.Īlso, at times one program is dependent on some other program. Therefore, every program we execute and every file we access must be copied from a storage device into main memory.Īll the programs are loaded in the main memory for execution. The computer is able to change only data that is in main memory. The word main is used to distinguish it from external mass storage devices such as disk drives. Main Memory refers to a physical memory that is the internal memory to the computer. What is Memory Management In Operating System?

Disk management in operating system