Computer Architecture II 1 Computer architecture II Introduction.
cse141: Introduction to Computer Architecture
Transcript of cse141: Introduction to Computer Architecture
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cse141: Introduction to Computer Architecture
Steven SwansonAlice Liang
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Today’s Agenda
What is architecture?Why is it important?What’s in this class?
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Computer Architecture
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What is architecture?• How do you build a machine that computes?
• Quickly, safely, cheaply, efficiently, in technology X, for application Y, etc.
• Architects develop new mechanism for performing and organizing “mechanical” computation
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Why is architecture important?• For the world
• Computer architecture provides the engines that power all of computing
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Civilization advances by extending the number of important operations which we can perform without thinking about them. -- Alfred North Whitehead
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Why is architecture important?• For the world
• Computer architecture provides the engines that power all of computing
• For you• As computer scientists, software engineers, and
sophisticated users, understanding how computers work is essential
• The processor is the most important piece of this story• Many performance (and efficiency) problems have their roots
in architecture.7
Civilization advances by extending the number of important operations which we can perform without thinking about them. -- Alfred North Whitehead
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Orientation
The internet
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Orientation
The internet
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• Architecturally, these machines are more similar than different• Same parts• Different Scale• Different Constraints
HandheldUltra PortableHigh-end Server
Motherboards to scale
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Orientation: A Server
PCIe
Mem
ory
Architecture begins about here.
Mem
ory
Mem
ory
Mem
ory
Mem
ory
Mem
ory
Mem
ory
Mem
ory
CPU Sockets
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Orientation: MacBook AirSystem
Hub
Memory
Architecture begins about here.
CPU
Con
nect
ors
SSD Slot
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Orientation: iPhone 4s
SimCard
Architecture begins about here.
CPU + DRAM
Flash Memoryon the back
Peripherals
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You are here
Nehalem Corei7Quad-core Server
processor
Nvidia Tegra 3Five-core mobile
processor
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The processors go here…
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The processors go here…
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The processors go here…
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The processors go here…
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The processors go here…
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The processors go here…
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The processors go here…
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The processors go here…
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The processors go here…
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The processors go here…
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The processors go here…
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The processors go here…
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Abstractions of the Physical World…
Physics/Materials Devices Micro-architecture ArchitecturesProcessors
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Abstractions of the Physical World…
Physics/Materials Devices Micro-architecture ArchitecturesProcessors
This Coursecse241a/ECE dept
Physics/Chemistry/
Material science
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…for the Rest of the System
Architectures
JVM
ProcessorAbstraction
Compilers LanguagesSoftware
Engineers/Applications
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…for the Rest of the System
Architectures
JVM
ProcessorAbstraction
Compilers LanguagesSoftware
Engineers/Applications
cse130cse121 cse131 cseEverythingElse
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Current state of architecture
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Moore’s Law• The number of transistors we can build in a fixed area
of silicon doubles (roughly) every two years.
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Moore’s Law is the most important
driver for historic CPU performance
gains
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Since 1940
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Since 1940
50,000 x speedup>1,000,000,000 x density
(Moore’s Law)
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Since 1940
Plug boards -> JavaHand assembling -> GCC
No OS -> Windows 7
50,000 x speedup>1,000,000,000 x density
(Moore’s Law)
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Since 1940
Plug boards -> JavaHand assembling -> GCC
No OS -> Windows 7
We have used this performance to makecomputers easier to use, easier to program,
and to solve ever-more complicated problems.
50,000 x speedup>1,000,000,000 x density
(Moore’s Law)
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Since 1940
Plug boards -> JavaHand assembling -> GCC
No OS -> Windows 7
We have used this performance to makecomputers easier to use, easier to program,
and to solve ever-more complicated problems.
50,000 x speedup>1,000,000,000 x density
(Moore’s Law)
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Where do We Get Performance?
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Where do We Get Performance?
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Clock speed
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Golden age: ~40-50%/year
Clock speed
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Golden age: ~40-50%/year
Modern era:~25%/year
Clock speed
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• Clock speed is the biggest contributor to power• Chip manufactures (Intel, esp.) pushed clock speeds
very hard in the 90s and early 2000s.• Doubling the clock speed increases power by 2-8x• Clock speed scaling is essentially finished.
• Most future performance improvements will be due to architectural and process technology improvements
The End of Clock Speed Scaling
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Power
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Power
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Power
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Power
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Power
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Power
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The Rise of Parallelism• Multi-processors
• If one CPU is fast, two must be faster!• They allow you to (in theory) double performance
without changing the clock speed.
• Seems simple, so why are becoming so important now• Speeding up a single CPU makes everything faster!
• An application’s performance double every 18 months with no effort on the programmer’s part.
• Getting performance out of a multiprocessor requires work.• Parallelizing code is difficult, it takes (lots of) work• There aren’t that many threads• Remember or look forward to cse120
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Intel P4(2000)1 core
Intel Core 2 Duo (2006)2 cores
AMD Zambezi(2011)
16 cores
SPARC T3(2010)
16 cores
Intel Nahalem(2010)4 cores
Nvidia Tegra 3(2011)5 cores
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Why This Class?
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The Goal of a Degree in CS or CE(My $0.02)
• To understand the components and abstractions that make up a modern computing system
• To understand how they impact a system’s performance, efficiency, and usefulness
• To be able to harness, modify, and extend them to solve problems effectively
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Goals for this Class
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• Understand how CPUs run programs• How do we express the computation the CPU?• How does the CPU execute it?• How does the CPU support other system components (e.g., the OS)?• What techniques and technologies are involved and how do they work?
• Understand why CPU performance (and other metrics) vary.• How does CPU design impact performance?• What trade-offs are involved in designing a CPU?• How can we meaningfully measure and compare computer systems?
• Understand why program performance varies• How do program characteristics affect performance?• How can we improve a programs performance by considering the CPU
running it?• How do other system components impact program performance?
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What’s in this Class
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• Instruction sets• MIPS• x86• ISAs and the compiler
• The processor pipeline• Basic design• Pipelining• Dealing with hazards• Speculation and control
• Measuring performance• Amdahl’s Law• Performance
measurement• Metrics
• The memory system• Memory technologies• Caching
• Operating system support• Virtual memory• Exceptions, interrupts• IO
• Introduction to multiprocessors
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Performance and You!• Live Demo
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cd demos/makejava -server -Xmx$[1024*1024*1024] -Xmx$[1024*1024*1024] LoopNest 1000 ijjava -server -Xmx$[1024*1024*1024] -Xmx$[1024*1024*1024] LoopNest 1000 ji
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cse141 Logistics
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Course Staff• Instructor: Steven Swanson
• Lectures Tues + Thurs• Office hours TBA
• TA: Alice Liang• Discussion sec: Wednesday.
• See the course web page for contact information and office hours:• http://cseweb.ucsd.edu/classes/
sp13/cse141-a/
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Academic Honesty• Don’t cheat.
• Cheating on a test will get you an F in the class and no option to drop, and a visit with your college dean.
• Cheating on homeworks means you don’t have to turn them in any more, but you don’t get points either. You will also take at least 25% penalty on the exam grades.
• Copying solutions of the internet or a solutions manual is cheating.
• Review the UCSD student handbook• When in doubt, ask.
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Your Tasks• Sign up for the mailing lists.• Read the text!
• Computer Organization and Design: The Hardware/Software Interface (4th Edition, revised) -- previous editions are not supported
• I’m not going to cover everything in class, but you are responsible for all the assigned text.
• Come to class!• I will cover things not in the book. • You are responsible for them too.
• Homeworks throughout the course. (20%)• Weekly quizzes on Thursdays (20%)• One midterm (25%)• One cumulative final (35%)
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Quizzes• Every Thursday, online.• Covers everything up to and including the
previous class• 20 Minutes, 4-5 questions• Roughly 2% of your grade each• No make-ups
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Homeworks• Assigned on Thursday, due one week later• Partly from the book.• These are the best way to prepare for the
tests.• Due in a TA’s box, 15 minutes before class
starts.• Check the assignment for which TA to turn it in to.• The mailboxes are located in the grad student mail
room on the second floor of the CSE building.
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The Link to 141L• You do not need to take 141L along with 141,
but you may need both to get your degree.• The classes are mostly independent, except
• We will study the MIPS ISA in 141, and you will implement it in 141L
• The discussions about processor implementation in 141 will be useful in 141L.
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Grading• Grading is on a 13 point scale -- F through A+
• You will get a letter grade on each assignment• Your final grade is the weighted average of the
assignment grades.• An excel spreadsheet calculates your grades
• We will post a sanitized version online once a week.• It will tell you exactly where you stand.• It specifies the curves used for the exams etc.
• OpenOffice doesn’t run it properly.
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