What Does CPU Mean?
What does CPU mean? It is the question that everyone asks and rightly so. The CPU in a computer is an essential part of the machine, especially when it is involved in the operation of the computer itself. While every computer has an internal operating system, which boots up from a specific software program and makes use of the CPU for execution of instructions, any machine can be brought up to date with new instructions by updating the "abi" or "processor", depending on what was previously used as the instruction-set.
When you ask someone to "turn on the computer", you mean that the computer's instruction set is executed. What does the CPU do? It reads the appropriate instruction from the program unit (PU) that is contained in the central processing unit (CPU) of your computer. Once the appropriate instruction is located, the CPU executes the program contained in the PU. This is what you see when you use your computer: it is the machine that does the work!
The CPU performs many different functions. First, it divides the requested instructions into chunks (microseconds), and then it executes each chunk one at a time. Next, it checks if the requested instruction is already executed; if it is, it will continue the current instruction. If not, it will proceed to the next instruction.
The CPU is also called a microprocessor. To give a short sketch of how this processor operates, it divides operations performed by the microprocessor into independent units (threads). This way, the operation of the processor is separated into different tasks (processes). One such task is the execution of a series of instructions that are passed along the system bus from the central processing unit through the system's software interface. The other tasks are commands that are read from the system bus and executed on the specific processing cores. In a multi-core processor, each core has its own dedicated task.
Instructions are read from an instruction pointer (IOP) and are then executed on the specific processing cores through the system bus. The IOP contains one or more instructions. Instructions are read and executed either sequentially or parallelily. If an instruction is sequentially executed, all instructions in the program are run together; if parallelly executed, the instructions are executed in groups of two or more.
The instruction pointer has a special meaning only when it comes into contact with one of the many peripheral devices that make up a typical personal computer. The IOP contains one single instruction, and if it happens to be the first one to be read, it is written to the target device's memory. Otherwise, it is used as an indication that another instruction has been successfully executed. If the instruction pointer is used parallelously, then all execution processes in the processor are combined into a single logical processing cycle.
The main job of the central processing unit (CPU) is to control and divide the processing load among the various microprocessors inside the machine. Modern microprocessor designs have made it possible for multiple independent microprocessors to perform the same tasks, thereby improving efficiency. The speed of a processor is directly related to the number of independent threads running at the same time. The higher the number of threads, the faster the processor will be. On the other hand, the slower the speed, the lower the throughput the processor can achieve.
The architecture of a PC or laptop will determine what does CPU mean? For those who are familiar with desktop computers, the answer is a relatively simple one: the central processing unit controls the operation of the computer. For those who are not so acquainted with what does CPU mean? Then it would be helpful to understand the different types of processing engines that are part of personal computers. Each of these engines operates in its own way, and they are each responsible for the way the PC works.