Computer operation system (i)

System Hardware Composition

• Bus: Throughout the system is a group of electronic pipelines, used to transfer bytes between the components, and the transmission of bytes is fixed, for example: 32 or 64 bits, we often say that your computer is 32 or 64 bits, refers to the computer transmission of fixed word length.
• Main memory: A temporary storage device used to store data processed by programs and programs, consisting of dynamic random access memory (DRAM).
• CPU: central processing Unit, command this data processing, the main operation has

Advanced Caching

CPU processing data if each time from the main memory read data re-operation, processing speed will be too slow, so in the CPU using the cache memory device, the internal use of static random access memory (SRAM) of the hardware technology composition.

Operating System Management Hardware

There are two basic features of the hardware:

• Prevent hardware from being abused by runaway applications.
• Provides a simple and consistent mechanism for the application to control complex hardware devices.

To achieve such a function, the operating system abstracts out several concepts, processes, virtual memory, and files.

• Process: Image to understand is a program occupies a certain resources of the hardware equipment. The following is a single-processing system switch process context.

• Thread: The smallest execution unit in a process that executes a task.
• Virtual storage: Provides an illusion for each process that each process uses the main memory exclusively. Here's an example.

If we print a phrase "Hello world!" in C language,

From the bottom up:

• File: Is the byte sequence, that's all.

Computer operation system (i)