![]() ![]() Paging : Paging is memory management techniques that allocating physical memory address space on the noncontinuous space allocation. Once the process is completed in RAM than virtual memory ’s operation go back in RAM for execution. Part of hard drive occupied by RAM‘s process acts as a virtual memory. Sometimes there is not sufficient space for the process to reside in RAM then some process temporary swap out from RAM and Swap in the hard disk. To execute any process, it should be present in RAM. RAM is too small in size as a comparison to Secondary Memory (Hard Disk) in the system. SRAM is more expensive and faster than DRAM. It uses only one transistor and one capacitor per bit. Dynamic RAM is more complicated it requires regular refresh cycles to prevent losing its contents. SRAM retains its contents till power is switched on. Volatile memory can be either SRAM ( Static Random Access Memory) or DRAM ( Dynamic Random Access Memory). It is approximately 50 times faster for sequential reads and writes operation. Accessing and processing Speed of the RAM as compared to a hard drive is very high. After processing data stored back into hard disk. Once the power is switched, data will be deleted from the system.To operate any process, its necessary data and instruction should load into RAM from hard disk. It is semiconductor memory require power to retain the information in the system. Volatile Memory (RAM): RAM is a Volatile memory. After that effort for volatile and non-volatile memory. Delay Line Memory could store a thousand bits of information in the form sound waves. In 1940, delay line memory became the part of computer memory. The ENIAC First programmable computer vacuum tube accumulators are used to hold the data. History : In an earlier computer, there was no mechanism to store a significant amount of data in the system. Virtual memory, swapping, buffering, paging, blocks, Internal fragment, and external fragment more concepts associated with the memory. Memory management one of the most crucial task performing by the operating system. To accelerate the speed of transferring data between primary and secondary memory, ‘Cache Memory’ concept used. Primary memory is hard to speed memory like RAM ( Random Access Memory), and Secondary memory is slow – to – access memory for example hard disk where data stored permanently. Two types of memory are used by the computer, one for storing data permanently and second for operating. It is a hardware device that assembled on the motherboard for storing data and instructions for performing a task on the system. Memory is an essential component of the computer. ![]()
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