Performance of pipelines with stalls, Computer Engineering

Assignment Help:

Performance of Pipelines with Stalls:

A stall is reason of the pipeline performance to degrade the ideal performance.

                                            Average instruction time un pipelined

Speedup from pipelining   =   ----------------------------------------

                                             Average instruction time pipelined

 

                                                    CPI un pipelined * Clock Cycle Time unpipelined

                                                = -------------------------------------

                                                     CPI pipelined * Clock Cycle Time pipelined

The ideal CPI on a pipelined machine is approximately always 1. Therefore, the pipelined CPI is CP I pipelined = Ideal CPI + Pipeline stall clock cycles per instruction

                            = 1 + Pipeline stall clock cycles per instruction

If we avoid the cycle time overhead of pipelining and suppose the stages are all perfectly balanced, then the cycle time of the 2 machines are equal and

 

                  CPI un pipelined

Speedup = ----------------------------

                  1+ Pipeline stall cycles per instruction

 

If all of the instructions take the similar number of cycles, which ought to be equal the number of pipeline stages (the depth of the pipeline) then un pipelined CPI is equivalent to the depth of the pipeline, leading to

 

                   Pipeline depth

Speedup = --------------------------

                  1 + Pipeline stall cycles per instruction

 

If there are no pipeline stalls, it leads to the intuitive result that pipelining can developed performance by the depth of pipeline.

 


Related Discussions:- Performance of pipelines with stalls

How many precision resistors requires a weighted resistor, A weighted resis...

A weighted resistor digital to analog converter using N bits requires a total of ? Ans. Digital to analog converter, a weighted resistor using N bits needs a total of N precisi

Explain the quantization error of an ADC, Explain the Quantization error...

Explain the Quantization error of an ADC. Ans. Quantization error- An analog voltage is within the range of 0 to 1V and for 3 bit output, the size of all intervals are

What is analysis iteration, Analysis Iteration   To understand any prob...

Analysis Iteration   To understand any problem completely you have to repeat task which implies that analysis requires repetition. First, just get overview of problem, make a r

Explain telephone hand set and working, Explain Telephone hand set and it's...

Explain Telephone hand set and it's working. A standard telephone set is consisted of a transmitter, electrical network and a receiver for equalization, connected circuitry to

Explain the following gray code, Q. Explain the following: a) Gray code ...

Q. Explain the following: a) Gray code b) Parity code c) Overflow Q. Give the counting up to 30 in Base 5. Q. Convert (175.6)8 into Gray code and Excess-3 code.

Ellipse follows the perimeter of the window, A) Execute a program where an ...

A) Execute a program where an ellipse follows the perimeter of the window. B)  Execute a program that can draw graphs, possibly following your plan from last week. Have it graph

Which technique is an encryption technique, Which technique is an encryptio...

Which technique is an encryption technique? Ans. Block cipher technique and also Steam cipher technique is an encryption technique.

Truth tables - artificial intelligence, Truth Tables - artificial intellige...

Truth Tables - artificial intelligence: In propositional logic, where we are limited to expressing sentences where propositions are true or false - we can check whether a speci

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd