Emerging Computing Trends in the Datacenter Dileep Bhandarkar,...
Transcript of Emerging Computing Trends in the Datacenter Dileep Bhandarkar,...
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Qualcomm Datacenter Technologies, Inc.
Emerging Computing Trends in the Datacenter
Dileep Bhandarkar, Ph. D.Vice President, Technology
Linaro Connect Keynote – 23 March 2018, Hong Kong
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Outline
• Historical Perspective on 40 Years of Moore’s Law– Single Core Era enabled by Dennard Scaling
• Post Dennard Scaling Drives Multi-Core Era• The Shift to Energy Efficient Multi-Core Designs for
the Cloud• Heterogenous Computing Era with Application
Specific Accelerators
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The First 50 Yearsafter
Shockley’s Transistor Invention
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1958: Jack Kilby’sIntegrated Circuit
My 40+ Year Journey From Mainframes to Smartphones https://www.youtube.com/watch?v=7ptXpNFY3XM
Bob Noyce’sIntegrated Circuit
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From 2300 to >1Billion Transistors
Moore’s Law video at http://www.cs.ucr.edu/~gupta/hpca9/HPCA-PDFs/Moores_Law_Video_HPCA9.wmv
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Dennard ScalingDevice or Circuit Parameter Scaling Factor
Device dimension tox, L, W 1/K
Doping concentration Na K
Voltage V 1/K
Current I 1/K
Capacitance eA/t 1/K
Delay time per circuit VC/I 1/K
Power dissipation per circuit VI 1/K2
Power density VI/A 1
The benefits of scaling : as transistors get smaller, they can switch faster and use less power. Each new generation of process technology was expected to reduce minimum feature size by
approximately 0.7x (K ~1.4). A 0.7x reduction in linear features size provided roughly a 2x increase in transistor density.
Dennard scaling broke down around 2004 with unscaled interconnect delays and our inability to scale the voltage and current due to reliability concerns.
But increasing transistor density (Moore’s Law) has continued to enable multicore designs.
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THE MULTICORE ERA
SINGLE THREAD PERFORMANCE IMPROVEMENT SLOWING DOWN
PERFORMANCE DRIVEN BY HIGHER CORE COUNT
Post Dennard Scaling
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Transistor CountIncreasing
Slower Improvement
No Improvement
Power Going UpWith Performance
Core count increasing to
drive Performance
Now Performance Improvement Comes from Higher Core Count at Similar Frequencywith Each New Process Node
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The last 5 Generations of ~135W Xeon Processors
Slow Improvement in IPC but per thread performance constrained by powerPerformance data from www.spec.org
8 coresMar 2012
10 coresSep 2013
12 coresSep 2014
14 coresApr 2016
18 coresJul 2017
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No Improvement in Perf/Watt per Coreeven with higher power
Performance data from www.spec.org
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Era of Energy Efficient Cores
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© 2017 Arm Limited 12
Looking ahead from edge to cloudThe future requires a new approach to CPU design
Safe and autonomous Hyper-efficient
Secure private compute
Cortex beyond mobile Mixed reality
Presented by Peter Greenhalgh at Hot Chips 2017
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Cloud
Traditional Enterprise IT
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2013 2014 2015 2016 2017 2018 2019 2020
Server Industry is shifting to the Cloud
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Disruptions Come from Below!
Mainframes
Minicomputers
RISC Systems
Desktop PCs
Notebooks
Smart Phones
Volume
Perf
orm
ance
Bell’s Law: hardware technology, networks, and interfaces allows new, smaller, more specialized computing devices to be introduced to serve a computing need.
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Qualcomm Datacenter TechnologiesUniquely positioned to leverage mobile growth and drive datacenter process leadership
65nm 45nm 28nm 20nm 10nm1st in theindustry
14nmMobile driven
NowThenFab process techdriven by PC
Fab process tech driven by mobile phones
PC driven
2008 2010 2012
2016
20182014 1.5B units
256M units
Smartphone unitsPC units
45nm 32nm 10nm14nm22nm
A new world in datacenter :
Manufacturing process
Mobile Technology Disrupting the Cloud Datacenter
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Qualcomm Centriq™
2400Throughput performanceThread DensityQuality of ServiceEnergy Efficiency
What Cloud means forProcessor Architecture
Key metrics• Perf / thread• Perf / Watt• Perf / mm2
The future requires a new approach to CPU design
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Computational + server growthfuel datacenter energy efficiency considerations
• 2014: US datacenters consumed 70 billion kilowatt-hours of electricity
• Datacenters can cost between $10M and $20M per megawatt
• Unused datacenter capacity can be expensive • 1W of server power can cost $1 per year in energy
costs at 10 cents per KWH• Server power related costs can be 30-50% of overall
datacenter operating costs• Servers need to be designed for average power
consumption (not just max peak output)• Hyper-efficient designs necessary to improve server
energy efficiency
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Falkor duplex
Falkorduplex
Falkor duplex
Falkor duplex
Falkor duplex
Falkor duplex
Falkor duplex
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Falkorduplex
Falkor duplex
Falkor duplex
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Falkor duplex
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L3L3L3L3 L3L3
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• 48 custom Armv8 cores at 2.6 GHz peak frequency• Large 60 MB L3 cache• 6 DDR4 memory channels at 2667 MT/s• High bandwidth coherent ring• Low average power under typical load• Ultra low idle power• Cache Quality of Service• Inline memory bandwidth compression• Security rooted in hardware• Leading performance and energy efficiency
Qualcomm Centriq 2400: Built for The Cloud
Details at https://www.qualcomm.com/products/qualcomm-centriq-2400-processor
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Qualcomm Centriq 2400 Drives Perf/W and Perf/Thread Leadership
1
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Q D F 2 4 6 0 P L AT I N UM 8 1 8 0 G O L D 6 1 3 8 P L AT I N UM 8 1 6 0 P L AT I N UM 8 1 7 0
Power SPECintrate2006 Perf/Watt Perf/Core Perf/Thread Perf/$
IsoPower IsoPerf48 cores
120 W TDP657 SIR2006
$1,995
20 cores125 W TDP
504 SIR2006$2,612
26 cores165 W TDP
653 SIR2006$7,405
28 cores205 W TDP
775 SIR2006$10,009
Top BinE7 Price
24 cores150 W TDP
612 SIR2006$4,702
Top Bin E5 Price SKU
Performance based on internal tests for SPECintrate2006 (SIR) estimates using gcc O2
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Qualcomm Centriq 2460 Lowers Average and Idle Powerto Improve Cloud Server Density in Datacenters
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SPECint®_rate2006 subtests
120W TDP
Median = 65W
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• Are we really serious about energy efficiency?• What should the Cost and Power constraints be? • How many instruction sets is too many?
• X86, ARM, MIPS, Power, RISC V• Have we reached the limit of high core count? SW Scalability?• Do we need to improve single thread general purpose performance?• What should the power limit be for a single socket?• How much performance are we willing to sacrifice for better security?• Is there a fundamental conflict between multi-tenancy and security?• Cost and convenience vs extreme security?• When does device scaling end? Will there be a sub pico nm era?
Many Questions to Ponder?
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Heterogenous Computing Era
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• Energy efficiency must be a implicit design target• Desktop PC CPU cores are too power hungry and not energy efficient• Wimpy cores are not good enough for servers• Servers can be designed by scaling up energy efficient mobile core design philosophy• Many workloads run best on different kinds of specialized processing engines• Each processing engine has its own strengths
Lessons from Mobile Computing
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• Order of Magnitude higher computational efficiency than general purpose processors
• Can accept inefficient implementation to reduce time to market• Many potential applications
– Machine Learning– Encryption– Data Compression– Video processing
• Need reasonable volume for business case• Algorithms need to be stable• Can they be programmable? Where do FPGAs fit?
The Age of Application Specific Accelerators
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Before the emergence of DNNs Algorithms and rule based systems were laboriously hand-codedBut by 2012, the ingredients for change were available
Sufficiently powerful GPU’s Readily available large data sets on the internet
The Emergence of Deep Neural Networks
Deep Neural Networks are becoming Pervasive
The turning point - ImageNet Competition 2012 “ImageNet Classification with Deep Convolutional Neural Networks”, Neural Information
Processing Systems Conference (NIPS 2012) Deep Neural Net enabled a performance breakthrough
Now - DNN’s are simpler to develop and deploy, ushering in radical change in many fields and entire industries
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Deep Learning is Growing Exponentially
Source: Google
Source: Google
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2727
Devices, machines,and things are becoming more intelligent
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2828
Learn, infer context, anticipate
Reasoning
Act intuitively, interact naturally, protect privacy
Action
Hear, see, monitor, observe
Perception
Offering new capabilities to enrich our lives
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Where does compute need to be and why?
. . .
• Bandwidth / Backhaul traffic• Compute Resources
• Power/Thermal Envelope• Privacy & Security
• Latency • Reliability
Central CloudDevices Edge Cloud
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What is “Edge”?
Cloudlets / edge nodes / edge gateways◦ 5-20ms latency◦ Optionally co-located with access
networks◦ Few server racks per site
. . .
Customer devices◦ Smartphones, connected cars, drones,
IoT sensors/devices◦ < 2 ms latency; millions of devices
Customer premises◦ Enterprises, homes, stadiums, cars◦ < 5 ms latency; 1000s of devices
Centralized clouds◦ > 100 ms latency ◦ 5-100 per operator or cloud
service provider◦ 100s-1000s of server racks
per site
EDGE
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Server/CloudTraining
Execution/Inference
DevicesExecution/Inference
AI is Increasingly Everywhere
Inference: on device, on the edge cloud, or centralized cloud depending on use case characteristics (latency, bandwidth, context)
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CPU• Free cycles available• ISA enhancements• Complementary with
other accelerators
GPU• Over-design (cost,
power) for AI
FPGA• Offers flexibility• Typically hard to
program & expensive
ASIC• Purpose-built• Energy and cost
efficient• Expensive to
design• Least flexible
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Training tends toward concentrated, centralized computation
Inference tends toward wide distribution
GPUsLarge DPU
CPUsSmall DPU
CPUsSmall DPULow cost
GPUsLarge DPUHigher Cost
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CPUs are not powerful enough for training, but have free cycles available for inference – opportunity for add-in accelerator cards Instruction Set enhancements can improve performanceGPUs have too much “extra baggage” that add cost and power for features not needed for AI – opportunity for domain specific acceleratorsFPGAs offer more flexibility, but are difficult to program and expensiveASICs are energy and product cost efficient, but less flexible
Deep neural networks are making significant strides in many areas speech, vision, language, search, robotics, medical imaging & treatment, drug discovery …
We have an opportunity to dramatically reshape our computing devices to better serve this emerging and growing marketExpect to see lots of innovation and excitement in the years to come
Thoughts on Future Silicon for Deep Learning
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• Single thread general purpose performance improvement is slowing down• Energy efficiency is extremely important in datacenters• ARM architecture enables energy efficient designs with good performance• Typical-use efficiency is becoming more important than peak output efficiency
in enterprise data centers• Idle mode power will become more important for servers• Smart power management can dynamically optimize server operation to
improve efficiency in normal use• Security improvements need even if they cost performance• There is plenty of opportunity for innovation on new application specific
architectures targeted for specific workloads
Concluding Remarks
Speculation Can Lead to a Meltdown!
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Nothing in these materials is an offer to sell any of the components or devices referenced herein.
©2018 Qualcomm Technologies, Inc. and/or its affiliated companies. All Rights Reserved.
Qualcomm is a trademark of Qualcomm Incorporated, registered in the United States and other countries, Qualcomm Centriq and Falkor aretrademarks of Qualcomm Incorporated. Other products and brand names may be trademarks or registered trademarks of their respectiveowners.
References in this presentation to “Qualcomm” may mean Qualcomm Incorporated, Qualcomm Technologies, Inc., and/or other subsidiaries orbusiness units within the Qualcomm corporate structure, as applicable.
Qualcomm Incorporated includes Qualcomm’s licensing business, QTL, and the vast majority of its patent portfolio.Qualcomm Technologies, Inc., a wholly-owned subsidiary of Qualcomm Incorporated, operates, along with its subsidiaries, substantially all ofQualcomm’s engineering, research and development functions, and substantially all of its product and services businesses, inc luding itssemiconductor business, QCT.
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