Memory disk cache software

Memory management is a method in the operating system to manage operations between main memory and disk during process execution. The main aim of memory management is to achieve efficient utilization of memory. Why Memory Management is required: Allocate and de-allocate memory before and after process execution.

To keep track of used memory space by processes. To minimize fragmentation issues. To proper utilization of main memory. To maintain data integrity while executing of process.

It is also known as a Virtual address. Logical address space can be defined as the size of the process. A logical address can be changed. Physical Address space: An address seen by the memory unit i. A Physical address is also known as a Real address. The set of all physical addresses corresponding to these logical addresses is known as Physical address space.

A physical address is computed by MMU. The physical address always remains constant. Static and Dynamic Loading: To load a process into the main memory is done by a loader.

There are two different types of loading : Static loading :- loading the entire program into a fixed address. It requires more memory space. Dynamic loading :- The entire program and all data of a process must be in physical memory for the process to execute. So, the size of a process is limited to the size of physical memory.

To gain proper memory utilization, dynamic loading is used. In dynamic loading, a routine is not loaded until it is called. All routines are residing on disk in a relocatable load format. One of the advantages of dynamic loading is that unused routine is never loaded.

This loading is useful when a large amount of code is needed to handle it efficiently. Static and Dynamic linking: To perform a linking task a linker is used.

A linker is a program that takes one or more object files generated by a compiler and combines them into a single executable file. Static linking: In static linking, the linker combines all necessary program modules into a single executable program. So there is no runtime dependency. Some operating systems support only static linking, in which system language libraries are treated like any other object module.

Dynamic linking: The basic concept of dynamic linking is similar to dynamic loading. A stub is a small piece of code. When the stub is executed, it checks whether the needed routine is already in memory or not. If not available then the program loads the routine into memory. Swapping : When a process is executed it must have resided in memory. Swapping is a process of swap a process temporarily into a secondary memory from the main memory, which is fast as compared to secondary memory.

A swapping allows more processes to be run and can be fit into memory at one time. The main part of swapping is transferred time and the total time directly proportional to the amount of memory swapped. Swapping is also known as roll-out , roll in, because if a higher priority process arrives and wants service, the memory manager can swap out the lower priority process and then load and execute the higher priority process.

After finishing higher priority work, the lower priority process swapped back in memory and continued to the execution process. Contiguous Memory Allocation : The main memory should oblige both the operating system and the different client processes. Any temporary files or work files will be permanentally deleted when the computer is rebooted or turned off.

Also, RAM disks can secure confidential documents or top secret documents from being retrieved by using data recovery software, because when the computer is rebooted of turned off, all traced of files on the RAM drive are unrecoverable. Once the data is lost from a RAM disk, its gone forever, never to be recovered ever again by using any of the world's data recovery software.

My hard drive has only a few megabytes left, but would a RAM disk solve the lack of storage space problem? My hard drive currently has 7. This would really help out users better manage their disk space in a more effective way, and to avoid using Disk Cleanup too often. ImDisk is one third party utility that can create a RAM disk without a disk size capacity limit. Deleted files that goes into the Windows Recycle Bin should also be moved into a RAM disk drive for users who hate to frequently empty the Recycle Bin.

So, when the computer is restarted or turned off, all of the data files and folders that are in the RAM disk drive will be lost permanentally. Read here on how to save disk space by using the Disk Cleanup utility that is built-in to Windows 7 and Windows The explained way on Saving Disk Space in Windows the effective way.

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