Perhaps you are using multiple computers and your files are located in different physical locations. And when was the list time you created a backup of all your files? You do back up, right? You probably get the picture. A file system is relatively simple, but it only works if you keep yourself very organized and disciplined.
They are mostly used in order to control access to shared memory. According to Mullender (2005) Semaphores techniques are used for synchronising the activities of the operating system. File descriptors are used in order to implement the semaphores, therefore creation of semaphores are not atomic. A race condition occurs when two or more processes use the semaphore simultaneously. Burns (1993) suggest that the availability of the resource to be used is showed by the creation of semaphores and they are implemented through
In figuring, multitasking is an idea of playing out numerous errands (otherwise called forms) over a specific timeframe by executing them simultaneously. New assignments begin and intrude on as of now began ones before they have achieved fulfillment, rather than executing the undertakings consecutively so each began errand needs to achieve its end before another one is begun. Therefore, a PC executes fragments of numerous undertakings in an interleaved way, while the assignments offer regular preparing assets, for example, focal handling units (CPUs) and primary memory. Multitasking does not inexorably imply that various assignments are executing at the very same time (simultaneously). At the end of the day, multitasking does not infer parallel execution, but rather it means that more than one assignment can be part-path through execution in the meantime, and that more than one undertaking is progressing over a given time of time.
Alternative Programs: Though Linux developers have done a great job at creating alternatives to popular Windows applications, there are still some applications that exist on Windows that have no equivalent Linux application FreeBSD Security : 1- Secure, powerful, supports patches and updates, along with port and package u / facilitate install other software, accompanied by a firewall, and no team that will always develop FreeBSD 2-Even without special settings of FreeBSD the system security is initially very high. stable for the data base, internet server, client server, and others. Small disk space. The amount of disk memory space in standard hosting is strictly
3.Access to any location on any device makes it more flexible. If we adopt the desktop virtualization technology, administrators can simply do centralized management the background processes on the server, so that we can achieve timely updates when access to server through the remote without affectation with 4 mobile terminals. The shortcomings or drawbacks of desktop virtualization technologies are: 1. Problems on centralized management: Virtualization allows multiple systems simultaneously run on a single server, so once the server hardware breaks down , all the systems will be forced to stop, giving the user a huge loss. 2.Problems of centralized storage: User’s data is stored in a centralized server, bringing the server enormous storage pressure.
The interaction could occur between two programs which are on the same computers or between two computers which are on different computers connected through internet. Compatibility testing is non functional testing in which it is check in which environment application can be run successfully .It is also checks whether your application can run successfully on different platform or environment Tester should have enough knowledge on the platform, hardware and software to understand the expected behavior of the application Type of compatibility testing 1) Hardware It check the software compatible with hardware configuration. 2) Operating System It checks your software compatibility with different operating like Windows, UNIX ,MAC. 3) Software IT checks whether the software developed is compatible with other software or not. 4) Network 5) Browser It checks the compatibility of the website with different browsers or not.
Random-access memory (RAM), often referred to as read/write memory (R/W), is designed so that information can be written into or read from the memory storage area. Random-access memory does not retain its contents if power is lost; therefore, it is a volatile type of memory. Random-access memory normally uses a battery backup to sustain its contents in the event of a power outage. For the most part, today’s programmable controllers use RAM with battery support for application memory. Random-access memory provides an excellent means for easily creating and altering a program, as well as allowing data entry.
Fig 2 - Benefits of Virtualization The figure above is self-explanatory depicting the importance of adopting the technique of virtualization. Without virtualization a single machine is going to use all the resources whereas with virtualization sharing of resources takes place among various machines at a time. The security concern in virtual environments is that by compromising a host or a guest it could be easy to exploit all virtual systems. On the basis of licence type, storage support, RAM per host, RAM per VM, live migration, major tools available for Virtualization in the market include: • VM ware (commercial, Full
Implementing Virtual Memory is feasible due to the following reasons: • In practice, most real processes do not need all the program code or at least not all at once. • Error handling code is not needed unless that specific error occurs, some of which are quite rare. The ability to load only the portions of processes that are actually needed (and only when they are needed) has several
Operating system is a system software that is manages a computer hardware and a computer software provides resources and a common service of computer programs. Operating system provides all computer program and other devise including firmware to perform any function. Time sharing is an operating system that perform schedule task for used the system this may include various types of software such as accounting software that is used for the cost allocation time of processor mass storage printing and other resources. Computer Hardware function inputs and outputs and memory allocations operating system acts between computer program and computer hardware these applications code usually executed directly the computer hardware and frequently