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Transcript of 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….
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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
May 3, 2023 Dept. of E&CE, GEC RAICHUR 6
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
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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
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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
May 3, 2023 Dept. of E&CE, GEC RAICHUR 9
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.
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May 3, 2023 Dept. of E&CE, GEC RAICHUR 11
The system comprises
an array of 16 non
identical tiles.
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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.
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The c-cores are
tightly coupled to
the host CPU via the
L1 data cache and a
specialized interface.
CONSERVATION CORES
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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
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May 3, 2023 Dept. of E&CE, GEC RAICHUR 16
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.
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ADVANTAGES
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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
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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
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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.
May 3, 2023 Dept. of E&CE, GEC RAICHUR 21
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.