About Lesson
Pipelining and parallelism are techniques used to improve the performance of CPUs by enabling simultaneous execution of multiple instructions.
Pipelining:
- Pipelining is the process of dividing the instruction cycle into multiple stages, with each stage performing part of the instruction. Each stage can work on a different instruction simultaneously, improving overall performance.
- Example stages in a typical pipeline:
- Fetch: Get the instruction from memory.
- Decode: Decode the instruction to understand what needs to be done.
- Execute: Perform the operation.
- Write-back: Store the result in memory.
Parallelism:
- Instruction-Level Parallelism (ILP): Allows multiple instructions to be executed simultaneously by different parts of the CPU.
- Data-Level Parallelism: Involves executing the same operation on multiple pieces of data in parallel.
- Multi-Core Processors: These processors can execute multiple threads or processes simultaneously, further enhancing performance.