Which one of the following is false about Pipelining?a)Increases the C...
False Statement about Pipelining:
The false statement about pipelining is option 'B', which states that pipelining reduces the execution time of an individual instruction.
Explanation:
What is Pipelining?
Pipelining is a technique used in computer architecture to increase the instruction throughput and improve the performance of the CPU. It allows multiple instructions to be overlapped in execution, dividing them into smaller stages and processing them concurrently.
Benefits of Pipelining:
1. Increases CPU Instruction Throughput: Pipelining allows multiple instructions to be executed simultaneously, overlapping the stages of instruction fetch, decode, execute, memory access, and write-back. This increases the overall instruction throughput of the CPU.
2. Increases Program Speed: By increasing the instruction throughput, pipelining effectively reduces the time taken to complete a program. This results in faster program execution and improved overall program speed.
False Statement:
Pipelining does not reduce the execution time of an individual instruction. In fact, pipelining introduces a certain amount of overhead due to pipeline stalls, which can increase the execution time of individual instructions in some cases.
Pipeline Stalls:
Pipeline stalls occur when there is a dependency between instructions that prevents the next instruction from executing immediately. These dependencies can be data dependencies (where an instruction depends on the result of a previous instruction) or control dependencies (where the next instruction depends on a branch or jump instruction).
When a pipeline stall occurs, the pipeline must wait for the dependency to be resolved before proceeding with the next instruction. This introduces a delay and can increase the execution time of individual instructions.
Conclusion:
While pipelining improves the overall instruction throughput and program speed, it does not necessarily reduce the execution time of an individual instruction. Pipeline stalls and dependencies can introduce delays, which may result in increased execution time for certain instructions.
Which one of the following is false about Pipelining?a)Increases the C...
In pipelining, each step operates parallel with other steps. It stores and executes instructions in an orderly manner.
The main advantages of using pipeline are :
- It increases the overall instruction throughput.
- Pipeline is divided into stages and stages are connected to form a pipe-like structure.
- We can execute multiple instructions simultaneously.
- It makes the system reliable.
- It increases the program speed.
- It reduces the overall execution time but does not reduce the individual instruction time.
Therefore option 2 is the false statement about Pipelining