Now that we have a short overview of the different operating systems, we will also address the use and the benefits of such OS. The Windows operating system was an option for many computer users for years. Although many versions of Windows has published some of the most popular of them is Windows XP. XP is based on the Windows NT family of operating systems. With an interface friendly and more compatible software, it has very popular operating system for a long period. There are many advantages and disadvantages of using Windows OS.

The benefits of using Windows graphical user interface, easy installation and greater compatibility with most hardware. With many advanced software, it is not necessary to specify the command line to change in order to make all parameters. The Windows family of operating systems can be used by anyone without prior training base in contrast to some Linux distributions. Another reason for the popularity of Windows games and software is available. Many powerful software such as Photoshop, AutoCAD, Matlab is available for Windows, which are widely used by many people, it is Windows OS.

After reading the benefits of using Windows, let me tell you, some of the disadvantages of the Windows operating system. They are most common and most irritating problems with the Windows operating system viruses and Trojan attacks. Almost every computer user faced with this problem. Many antivirus programs are available now and are trying their best to provide maximum protection for PC users. Besides the above-mentioned drawbacks, Windows uses a lot of computer resources to give a good performance.

Linux is on the other hand is extremely fast and allows minimal use of CPU resources and allows for optimal performance. Therefore, Linux web hosting much cheaper than Windows hosting is. One of the main advantages of using Linux distributions is that there is no need for an antivirus program to protect PCs from viruses, because viruses do not affect the file system Linux.

Some Linux distributions Latest OpenSUSE, Ubuntu, Red Hat Linux. Among the many distributions, Ubuntu is the most popular Linux distribution. The latest version 9 10 has many improvements and deserves to be tried by all computer users. You can download a disk image from the website or a CD if you have a slow Internet connection.

The first thing you should do get a Live CD for Linux. Some stores have live CD that you buy a very cheap price. You can access sites such as Ubuntu and load the CD and burn it onto a blank CD of your choice. You can get a free CD by many Linux distributions. You can also buy a magazine with a Linux CD to get into them, with an operating system on them.

Once you have the CD, insert it into the CD-ROM drive and shut down the PC. If you turn it on, you should start the option, the computer normally or boot from the CD. If you boot from the CD, not deleted or you lose your computer. The operating system is run from the CD and you can try what you want. Once you stop, all changes will be lost, but you can keep the CD as long as you want.

There should be some considerations to keep in mind. There are many Linux distributions or versions, you can try. Ubuntu is a good starting point, but there are many others to try. A live CD runs slower than if you had installed the operating system on the computer. If something is slow or too late, it is probably because the distance between your computer read from the CD and view on your screen.

Competition in the processor systems
One might think that, how many threads can run simultaneously, if a single processor. In a single processor system, even though multiple threads can not operate simultaneously, but one thread can be displaced by an interrupt, or it can be descheduled run at a different thread on the CPU. Preemption may raise competition concerns even data loss, etc. Result barring an interruption masking is a simple technique used on single processor systems to solve problems associated with competition. If a global variable is both an interrupt handler and a kernel thread, the interrupts are masked, the wire during the read shared / update the shared variable.

Competition on SMP systems
On an SMP system are two or more processors on a single shared main memory. Several threads can run simultaneously on different processors, and can access data simultaneously on the main memory. Here is masking interrupts on a single processor or all processors solve the problem is not that we are still running talks on other processors. We need more complex mechanisms by which we will discuss later.

Problems with simultaneous access to shared resources
It is very important to understand the problems or side effects caused by simultaneous access to a resource from multiple threads. Let us understand this with a simple example.

Suppose there is a global variable called “state” (8 bits wide). Consider two threads where one thread wants to define a number of bits, while thread 2 wants the number two state bits of the shared variable. If a bit is already set, they must stay together.

To set a bit, a processor must be followed by three operations

1) Read to register the current value of the internal in his memory.
2) Set the bit in the register.
3) Keep to register the change in value in the memory.

In fact, the common steps to the read-modify-write must be performed. Let the initial value of global variable “state” is 0xF0 (11110000b). The final value after the execution of two son should 0xF3 (11110011b). However, this is not the case. It may happen that the final value of the “state” is either 0xF1 or 0xF2 or 0xF3. This can occur when both run simultaneously son. See the following example.

1) First, a wire-load value (0xF0), the global variable “state” in its registry.
2) Then, two wire-load value (0xF0), the global variable “state” in its registration. (Since only one processor to access memory at a time to accept that a thread loads the first value, the thread-2)

3) Thread-1 Number of bits set to 1, in its register (0xF0 -> 0xF1). Thread-2 also defines two number of bits in the register (0xF0 -> 0xF2) (two processors to do the same because they use their internal registers.)

4) About one-saves the current value (0xF1) in its register memory.
5) Then thread 2 saves the value (0xF2) in its register memory
(Suppose a new thread first stores)

This is the final value 0xF2 0xF3 it should have been. We lost a number of bits set by a thread.
If the thread-2 have their first stored value, the final value 0xF1. have been lost in this case, bit by thread-2 would be. May result in access to competitive data corruption.

How to solve the above problem

The above problem can be solved only if all three operations can be prevented in one step (all other processors to access the shared variable performed while the CPU is a read-modify-write to him.)

For this we need the support of the process equipment. Most modern processors provide instructions to perform the above operations atomic.

Take an example of a 80386

80 386 contains an instruction “SLL”, a little reminder. The format is as follows: memaddr SLL, bitnum / / This will set memaddr bitnum

But there is no guarantee that the above operation is atomic. To solve this problem is a mechanism 80 386, the memory bus can be blocked until the read-modify-write instruction has completed execution. This will precede the instruction opcode of “lock” done. If the controller detects the lock code, it locks the memory bus is completed by the investigation. No other processor accessing the memory bus until the investigation is complete blocked design.

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The ability of the service provider to manage the operating system decides what they offer but it is often because Linux is an open source operating system.

Windows operating system is also available in most cases. Support for the operating system with the necessary updates such as hotfixes, service packs and security updates are also supported by the service if it is contained in the agreement.

The bandwidth is another important aspect of dedicated servers. They could very high bandwidth connection causes a fast to your website. There are three options to choose from. Three bandwidth options begin with 1000 GB per month. The measurement is made by different suppliers with different methods. Some providers charge the total traffic in the calculation, while others completely, or whether the movement is higher. In addition, some of the calculation of the sum. However, if the customer needs more bandwidth there is an opportunity for him to go to the next level with a fee.

If you want to outsource dedicated servers is one of the benefits you will receive a very high bandwidth. This is because there are several providers of high-voltage power networks at high speeds, very low prices. You are able to ensure a very high this time networking with more providers with materials that are otherwise redundant.