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- Q2490641 subject Q7888482.
- Q2490641 abstract "Instruction pipelining is a technique that implements a form of parallelism called instruction-level parallelism within a single processor. It therefore allows faster CPU throughput (the number of instructions that can be executed in a unit of time) than would otherwise be possible at a given clock rate. The basic instruction cycle is broken up into a series called a pipeline. Rather than processing each instruction sequentially (finishing one instruction before starting the next), each instruction is split up into a sequence of steps so different steps can be executed in parallel and instructions can be processed concurrently (starting one instruction before finishing the previous one).Pipelining increases instruction throughput by performing multiple operations at the same time, but does not reduce instruction latency, which is the time to complete a single instruction from start to finish, as it still must go through all steps. Indeed, it may increase latency due to additional overhead from breaking the computation into separate steps and worse, the pipeline may stall (or even need to be flushed), further increasing the latency. Thus, pipelining increases throughput at the cost of latency, and is frequently used in CPUs but avoided in real-time systems, in which latency is a hard constraint.Each instruction is split into a sequence of dependent steps. The first step is always to fetch the instruction from memory; the final step is usually writing the results of the instruction to processor registers or to memory. Pipelining seeks to let the processor work on as many instructions as there are dependent steps, just as an assembly line builds many vehicles at once, rather than waiting until one vehicle has passed through the line before admitting the next one. Just as the goal of the assembly line is to keep each assembler productive at all times, pipelining seeks to keep every portion of the processor busy with some instruction. Pipelining lets the computer's cycle time be the time of the slowest step, and ideally lets one instruction complete in every cycle.The term pipeline is an analogy to the fact that there is fluid in each link of a pipeline, as each part of the processor is occupied with work.".
- Q2490641 thumbnail 5_Stage_Pipeline.svg?width=300.
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- Q2490641 comment "Instruction pipelining is a technique that implements a form of parallelism called instruction-level parallelism within a single processor. It therefore allows faster CPU throughput (the number of instructions that can be executed in a unit of time) than would otherwise be possible at a given clock rate. The basic instruction cycle is broken up into a series called a pipeline.".
- Q2490641 label "Instruction pipelining".
- Q2490641 depiction 5_Stage_Pipeline.svg.
