Which one of the following is false about Pipelining?a)Increases the CPU instruction throughputb)Reduces the execution time of an individual instructionc)Increases the program speedd)1 and 2Correct answer is option 'B'. Can you explain this answer?

EduRev

All Courses

Explore Courses UPSC Exam UPSC Test Series Free Notes EduRev Infinity

Open App

GATE Exam > GATE Questions > Which one of the following is false about Pip...

Join the Discussion on the App

Which one of the following is false about Pipelining?

a)
Increases the CPU instruction throughput
b)
Reduces the execution time of an individual instruction
c)
Increases the program speed
d)
1 and 2

Correct answer is option 'B'. Can you explain this answer?

FREE This question is part of

Test: Instruction Pipeline

Attempt Test

Attempt this Test

Most Upvoted Answer

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.

Free Test

FREE

Test: Instruction Pipeline
10 Ques | 30 Min

Start Free Test

View all free GATE tests

Community Answer

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

Share via Whatsapp

View all answers Start learning for free

< Previous Question Next Question >

Explore Courses for GATE exam

Similar GATE Doubts

Consider a non-pipelined processor operating at 2.5 GHz. It takes 5 clock cycles to complete an instruction. You are going to make a 5-stage pipeline out of this processor. Overheads associated with pipelining force you to operate the pipelined processor at 2 GHz. In a given program, assume that 30% are memory instructions, 60% are ALU instructions and the rest are branch instructions. 5% of the memory instructions cause stalls of 50 clock cycles each due to cache misses and 50% of the branch instructions cause stalls of 2 cycles each. Assume that there are no stalls associated with the execution of ALU instructions. For this program, the speedup achieved by the pipelined processor over the non-pipelined processor (round off to 2 decimal places) is _____. Correct answer is between '2.15,2.18'. Can you explain this answer?

View answer

Consider an instruction pipeline with five stages without any branch prediction: FetchInstruction (FI), Decode Instruction (DI), Fetch Operand (FO), Execute Instruction (EI) andWrite Operand (WO). The stage delays for FI, DI, FO, EI and WO are 5 ns, 7 ns, 10 ns, 8 nsand 6 ns, respectively. There are intermediate storage buffers after each stage and the delay ofeach buffer is 1 ns. A program consisting of I2 instructions I1 , I2 , I3 ,......I is executed in thispipelined processor. Instruction I4 is the only branch instruction and its branch target is 9 I . Ifthe branch is taken during the execution of this program, the time (in ns) needed to completethe program is

View answer

Consider a non-pipelined processor operating at 2.5 GHz. It takes 5 clock cycles to complete an instruction. You are going to make a 5-stage pipeline out of this processor.Overheads associated with pipelining force you to operate the pipelined processor at 2 GHz. In a given program, assume that 30% are memory instructions. 60% are ALU instructions and the rest are branch instructions. 5% of the memory instructions cause stalls of 50 clock cycles each due to cache misses and 50% of the branch instructions cause stalls of 2 cycles each. Assume that there are no stalls associated with the execution of ALL) instructions. For this program, the speedup achieved by the pipelined processor over the non-pipelined processor (round off to 2 decimal places) is ________. Correct answer is '2.16'. Can you explain this answer?

View answer

Consider a 5-stage pipeline having stages as Instruction Fetch (IF), Instruction Decode (ID), Operand Fetch (OF), Execute (EX) and Write Back (WB). Here we are given 4 instructions. IF, ID, OF and WB stages take 1 clock cycle each, but the EX-stage takes 1 cycle for ADD and SUB, 2 cycles for MUL and 3 cycles for DIV operation. If the operand forwarding technique is used from EX stage to OF stage and the clock rate of pipeline processor is 5 GHz, then choose the correct statement(s), considering the below table

View answer

The memory access time is 1 nanosecond for a read operation with a hit in cache, 5 nanoseconds for a read operation with a miss in cache, 2 nanoseconds for a write operation with a hit in cache and 10 nanoseconds for a write operation with a miss in cache. Execution of a sequence of instructions involves 100 instruction fetch operations, 60 memory operand read operations and 40 memory operand write operations. The cache hit-ratio is 0.The average memory access time (in nanoseconds) in executing the sequence of instructions is __________.

View answer

Which one of the following is false about Pipelining?a)Increases the CPU instruction throughputb)Reduces the execution time of an individual instructionc)Increases the program speedd)1 and 2Correct answer is option 'B'. Can you explain this answer?

Share with a Friend

Answer this doubt

Question Description
Which one of the following is false about Pipelining?a)Increases the CPU instruction throughputb)Reduces the execution time of an individual instructionc)Increases the program speedd)1 and 2Correct answer is option 'B'. Can you explain this answer? for GATE 2024 is part of GATE preparation. The Question and answers have been prepared according to the GATE exam syllabus. Information about Which one of the following is false about Pipelining?a)Increases the CPU instruction throughputb)Reduces the execution time of an individual instructionc)Increases the program speedd)1 and 2Correct answer is option 'B'. Can you explain this answer? covers all topics & solutions for GATE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which one of the following is false about Pipelining?a)Increases the CPU instruction throughputb)Reduces the execution time of an individual instructionc)Increases the program speedd)1 and 2Correct answer is option 'B'. Can you explain this answer?.

Solutions for Which one of the following is false about Pipelining?a)Increases the CPU instruction throughputb)Reduces the execution time of an individual instructionc)Increases the program speedd)1 and 2Correct answer is option 'B'. Can you explain this answer? in English & in Hindi are available as part of our courses for GATE. Download more important topics, notes, lectures and mock test series for GATE Exam by signing up for free.

Here you can find the meaning of Which one of the following is false about Pipelining?a)Increases the CPU instruction throughputb)Reduces the execution time of an individual instructionc)Increases the program speedd)1 and 2Correct answer is option 'B'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of Which one of the following is false about Pipelining?a)Increases the CPU instruction throughputb)Reduces the execution time of an individual instructionc)Increases the program speedd)1 and 2Correct answer is option 'B'. Can you explain this answer?, a detailed solution for Which one of the following is false about Pipelining?a)Increases the CPU instruction throughputb)Reduces the execution time of an individual instructionc)Increases the program speedd)1 and 2Correct answer is option 'B'. Can you explain this answer? has been provided alongside types of Which one of the following is false about Pipelining?a)Increases the CPU instruction throughputb)Reduces the execution time of an individual instructionc)Increases the program speedd)1 and 2Correct answer is option 'B'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice Which one of the following is false about Pipelining?a)Increases the CPU instruction throughputb)Reduces the execution time of an individual instructionc)Increases the program speedd)1 and 2Correct answer is option 'B'. Can you explain this answer? tests, examples and also practice GATE tests.

Explore Courses for GATE exam