| Memory Management |
| This is the module of the Operating System that manages memory in a system by deciding when to allocate and de-allocate memory to a process, how much to allocate and the scheduling of these processes. The following section lists the major concepts and terminologies that are related to Memory Management. |
Virtual Memory
Virtual Memory refers to the concept whereby a process with a larger size than available memory can be loaded and executed by loading the process in parts. The program memory is divided into pages and the available physical memory into frames. The page size is always equal to the frame size. The page size is generally in a power of 2 to avoid the calculation involved to get the page number and the offset from the CPU generated address. The virtual address contains a page number and an offset. This is mapped to the physical address by a technique of address resolution after searching the Page Map Table.
Paging
In Virtual Memory Systems, a program in execution or a process is divided into equal sized logical blocks called pages that are loaded into frames in the main memory. The size of a page is always in a power of 2 and is equal to the frame size. Dividing the process into pages allows non-contiguous allocation in these systems.
Segmentation
Segmentation is a memory management technique that supports Virtual Memory. The available memory is divided into segments and consists of two components- a base address that denotes the address of the base of that segment and a displacement value that refers to the length of an address location from the base of that segment. The effective physical address is the sum of the base address value and the length of the displacement value.
Memory Location Policy
The relocation policy specifies the thresholds of the overall system-supported metrics as well as policy window which is the time window to be used for metric history collected by the WPAR Manager agent, and agent polling time which states how long the agent should wake up to analyze policy violations.
Location Of Outdoor System
The output from these devices is input for the computer. Similarly, printers and monitors take as input signals that a computer outputs. They then convert these signals into representations that human users can see or read. For a human user the process of reading or seeing these representations is receiving input. These interactions between computers and humans is studied in a field called human–computer interaction.
RELOCATION OF PAGING SYSTEM
If your PC's hard drive is divided into partitions, moving your paging file may enable you to achieve better system performance. The paging file is an area of your hard drive that Windows uses as RAM in what is called "virtual memory." Follow these steps to relocate the paging file to a different partition than the one containing your Windows system files.
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