The difference between 32-bit and 64-bit: How to choose operating system

Operating system
Slightly 32-bit and 64-bit, and most users are not clear about the difference between 32-bit and 64-bit. , only know that "memory is greater than 4G", you can install a 64-bit system, the following is a detailed description of the difference between the 32-bit and 64-bit systems, which is better?

1, the difference between 32-bit and 64-bit

The essence is that the number of bits running simultaneously in the program is widened, and a metaphor may be used to explain these better: for example, at a speed limit of 100 km On the highway of /h, one is 32 meters wide and one is 64 meters wide (the metaphor is a bit exaggerated), and it is exercised at the same speed. Obviously, the 64-meter-wide highway can have up to twice the vehicle running. Similarly, one 64-bit programs or operating systems can process more bits at the same time, but they arrive at the same time, because they are at the same speed, at 100km/h. For larger programs, the 64-bit speed will increase due to the more bits processed at the same time.

2, 64-bit programs will run twice as fast as 32-bit?

The answer is no, 64-bit means that the operating system and CPU will use the 64-bit instruction set, but it does not mean that the CPU will run at twice the speed of 32-bit. The biggest advantage of 64-bit is operation. The system can control more memory. By default, the 32-bit system can control up to 4GB of memory, but due to the limitations of the Windows
system, only 3.25G can be displayed because it also has some memory. Storage BIOS, various interfaces, address information of facilities such as input and output, etc., which account for about 700M, but please rest assured that they are not wasted.

And 64-bit systems can control up to 192GB of memory, there is more available memory, systems and programs will run faster, because more frequently used data can be added to the memory cache, which is the decision of the computer One of the important factors in the speed of operation.

3, will a 64-bit program run faster than a 32-bit program?

It depends on the program and the environment. For example, a program needs to use more than 4GB of memory, then the 64-bit operating system will provide more resources, including the ability to increase the cache. This can be seen in the very popular database program using MySQL, MySQL can run on both 32-bit and 64-bit systems, and larger databases need to run on 64-bit systems to get more memory and cache resources. However, it is more limited on 32-bit systems, which can make the database call and query more rapid. At the same time, many 64-bit programs are more efficient in encoding and will speed up the process. For smaller 64-bit programs, only less memory is needed, and the speed can only be changed completely, which depends on the coding efficiency of the program.

4, 64-bit system is right for me?

If your computer has 4G or more of memory, it is a good idea to install a 64-bit system, but note that a 64-bit system equivalent to a 32-bit system will obviously take up more. Memory resources. There are many reasons for the more memory usage, including the occupation of memory addresses. The 32-bit memory address occupies 4, and the 64-bit memory address occupies 8. In addition, the 64-bit operating system supports both 32-bit and 64-bit. The program, therefore, has up to twice the library file (.dll file) and will take up more memory. Because a library file with the same effect is also divided into 32-bit and 64-bit, it may be called at the same time because 32-bit and 64-bit programs are running at the same time, thus consuming more memory. In a 32-bit system, this situation does not exist.

So my suggestion is, don't blindly pursue 64-bit, 64-bit memory selection above 4G is almost inevitable, to avoid wasting hardware resources, for computer
with 4G memory Users, according to their own frequently running programs, if most of them are 32-bit, or 64-bit programs are relatively small, occupy less resources, or choose a 32-bit operating system is more appropriate! For users with less than 4G of memory, I prefer a 32-bit operating system. Using a 64-bit system, because it takes up more memory, it will cause the system and program to run slowly.