Greendroid ppt

WELCOME

GOVERNMENT ENGINEERING COLLEGE RAICHUR

A Seminar on

GREENDROIDAN ARCHITECTURE FOR DARK SILICON AGE

Shreyas Kardalli

May 3, 2023

2

Presented By:

Dept. of E&CE, GEC RAICHUR

Guidance:Prof.SaraswatiHOD & Associate ProfessorDept. Of Electronics And Communication Engineering

(3GU10EC030)

CONTENTS

May 3, 2023 Dept. of E&CE, GEC RAICHUR 3

1) INTRODUCTION

2) NECESSITY

3) DARK SILICON

4) THE UTILIZATION WALL

5) ARCHITECTURE OF GREENDROID

6) CONSERVATION CORES

7) ADVANTAGES

8) APPLICATIONS

9) CONCLUSION

10) REFERENCES

INTRODUCTION

May 3, 2023 Dept of E&CE, GEC RAICHUR 4

1) Mobile phone are now replaced by Smart phone that run on the open source operating systems such as Android or IOS.

2) The Green Droid mobile application processor is a 45-nm multi core research prototype that targets the Android mobile

phone software stack.

3) It can execute general purpose mobile programs with 11 times less energy than today’s most energy-efficient designs, at similar or better performance levels. 4) GREENDROID will serve as a prototype for mobile application processors in the next five to ten years.

Contd….


5) It has a specially built structure that can analyze a current Android phone and determine which apps,

and which CPU circuits the phone is using the most. 6) Then it can dream up a processor design that best takes

advantage of those usage habits, creating a CPU that’s both faster and more energy efficient.

NECESSITY


1) A key technological problem for microprocessor architects

is the utilization wall.

2) The utilization wall says that, with each process generation,

the percentage of transistors that a chip design can switch at full

frequency drops exponentially because of power constraints.

3) A direct consequence of this is Dark Silicon.

DARK SILICON


1) How many transistors you can actually use simultaneously given your power budget – the gap between area gains and power gains.

2) Dark silicon is necessary, because engineers are unable to reduce chips operating voltages any further to offset

increases in power consumption and waste heat produced by smaller, faster chips .

3) This dark silicon limits the utilization of the application processors to the fullest.

THE UTILIZATION WALL


Scaling theorya) Transistor and power budgets no longer balancedb) Exponentially increasing problem.

Experimental resultsa) Replicated small data pathb) More ‘Dark Silicon’ than active

Observations in the wilda) Flat frequency curveb) Increasing cache/processor ratio

ARCHITECTURE OF GREENDROID


1) The GreenDroid architecture uses specialized, energy-

efficient processors, called conservation cores, or c-cores

to execute frequently used portions of the application code.

2) Collectively, the c-cores span approximately 95 percent of

the execution time of team’s test Android-based workload.

May 3, 2023Dept. of E&CE, GEC RAICHUR 10


The system comprises

an array of 16 non

identical tiles.


Each tile holds components

common to every tile

the CPU, on-chip network

(OCN) and shared Level 1

(L1) data cache—and

provides space for multiple

conservation cores (c-cores)

of various sizes.


The c-cores are

tightly coupled to

the host CPU via the

L1 data cache and a

specialized interface.

CONSERVATION CORES


Specialized Cores For Reducing EnergyAutomatically generated from hot regions of program sourcePatching support future proofs HW

Fully Automated Tool ChainDrop-in replacements for codeHot code implemented by C-Core, cold code runs on host CPUHW generation/SW integration

Energy EfficientUp to 16x for targeted hot code


Figure shows the projected energy savings in GreenDroid and the origin of these savings.

The savings come from two sources

1) First, c-cores don’t require instruction fetch, instruction decode, a conventional register file, or any of the associated structures. Removing these reduces energy consumption by 56 percent.

2) The second source of savings (35 % of energy) comes from the specialization of the c-cores data path.

3) The result is that average per-instruction energy drops from 91

pJ per instruction to just 8 pJ per instruction.

ADVANTAGES


1) Less power consumption.

2) Most faster than android

3) More Efficient

4) Easy to use

5) Life time is more

6) More application is available in GreenDroid than

android.

APPLICATIONS


1) GreenDroid is a boon for dark silicon problem.

2) Can be used for desktop processors.

3) Power savings can be applied to other program, increasing

throughput


CONCLUSION

Over the next five to 10 years, the breakdown of conventional silicon

scaling and the resulting utilization wall will exponentially increase the

amount of dark silicon in both desktop and mobile processors.

The Green Droid prototype demonstrates that c-cores offer a new

technique to convert dark silicon into energy savings and increased

parallel execution under strict power budgets.

The estimate that the prototype will reduce processor energy

consumption by 91 percent for the code that c-cores target, and result in

an overall savings of 7.4 times.


REFERENCE1) G. Venkatesh et al., Conservation Cores: Reducing the Energy of

Mature Computations,: Proc.15th Intl Conf.Architectural Support for

Programming Languages and Operating Systems, ACM Press, 2010,

pp. 205/-218. 15th Intl. Conf. Architectural Support for Prog.

Languages and Op. Sys., Mar. 2010.

2) N. Goulding et al., GreenDroid: A Mobile Application

Processor for a Future of Dark Silicon, HotChips, 2010.

3) M. Taylor et al., The Raw Processor: A Scalable 32 bit Fabric

for General Purpose and Embedded Computing, HotChips, 2001.

Greendroid ppt

Engineering

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