The CPU is the "brain" of the computer, which is responsible for interpreting and executing the instructions in the computer program. The CPU reads instructions from the memory and performs corresponding operations according to the instructions, such as arithmetic operation, logical operation and data transmission. CPU manages and schedules memory, hard disk, graphics card, input and output devices, etc. By sending control signals to ensure that they can work as expected.
When the hardware device sends an interrupt request, the CPU will handle the interrupt according to the priority, switch the context as needed, and execute the corresponding interrupt service program. CPU is one of the most important components in computer system, and its performance is usually measured by clock frequency. The higher the clock frequency, the stronger the processing power.
Main factors affecting CPU performance:
1, CPU architecture: Different CPU architectures have different performance characteristics, such as the diversity of instruction sets and pipeline structures.
2. Main frequency: The higher the CPU main frequency, the more instructions can be executed per second, and the stronger the performance.
3. Cache size: Cache is the high-speed memory inside the CPU. A larger cache can improve the speed of data access and speed up the calculation process.
4. Front-end bus bandwidth: The front-end bus is used to transmit instructions and data. The greater the bandwidth, the higher the communication efficiency between CPU and other components.
5. memory bandwidth: The data transmission speed between CPU and memory will also affect the performance. Fast memory bandwidth can reduce data waiting time.
6, heat dissipation performance: high-performance CPU generates a lot of heat, if the heat dissipation is poor, the CPU temperature is too high, which will lead to performance degradation.