EIE/ENE 334 Microprocessors
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1 EIE/ENE 334 Microprocessors Lecture 01: Introduction to Digital Computer System Week #01: Dejwoot KHAWPARISUTH Adapted from Computer Organization and Design, 4 th Edition, Patterson & Hennessy, 2009, Elsevier (MK) Page 1
2 Evaluations: Hw 5% Quiz 15% Midterm 40% Final 40% Note: 14 weeks of classes (only 2 absent weeks allowed, or Fa ) ENE 334: Introduction to Digital Computer System week #01 Page 2
3 Textbooks: ENE 334: Introduction to Digital Computer System Page 3 week #01 David A. Patterson, John L. Hennessy, Computer Organization and Design: The Hardware/Software Interface, Morgan Kaufmann Publishers, 4th edition. Chapter 1-4 Appendix B,E
4 Textbooks: Call Number: QA76.73.A8 HOL 2009 ENE 334: Introduction to Digital Computer System Page 4 week #01 William Hohl, ARM Assembly Language: Fundamentals and Techniques, CRC, 2009 ARM7TDMI (ARM Version 4T)
5 Textbooks: Joseph Yiu, The Definitive Guide to the ARM Cortex-M0, Newnes, ENE 334: Introduction to Digital Computer System Page 5 week #01
6 EIE/ENE 335 : Lab T2/56 ENE 334: Introduction to Digital Computer System Page 6 week #01
7 Objectives: ENE 334: Introduction to Digital Computer System Page 7 week #01 Digital Computer System To understand both hardware and software Hardware/software interface MIPS Architecture ARM Cortex-M0 Subroutines
8 Page 8 Chapter 1 Computer Abstractions and Technology
9 The Computer Revolution Progress in computer technology Underpinned by Moore s Law Makes novel applications feasible Computers in automobiles Cell phones Human genome project World Wide Web Search Engines Computers are pervasive 1.1 Introduction Chapter 1 Computer Abstractions and Technology 9 Page 9
10 Different classes of applications: ENE 334: Introduction to Digital Computer System Page 10 week #01
11 Classes of Computers Desktop computers General purpose, variety of software Subject to cost/performance tradeoff Server computers Network based High capacity, performance, reliability Range from small servers to building sized Embedded computers Hidden as components of systems Stringent power/performance/cost constraints Chapter 1 Computer Abstractions and Technology 11 Page 11
12 Classes of Computers: ENE 334: Introduction to Digital Computer System Page 12 week #01
13 Some Basic Definitions: ENE 334: Introduction to Digital Computer System Page 13 week #01
14 The Processor Market Chapter 1 Computer Abstractions and Technology 14 Page 14
15 Different classes of applications: ENE 334: Introduction to Digital Computer System Page 15 week #01
16 What You Will Learn How programs are translated into the machine language And how the hardware executes them The hardware/software interface What determines program performance And how it can be improved How hardware designers improve performance What is parallel processing Chapter 1 Computer Abstractions and Technology 16 Page 16
17 Understanding Performance Algorithm Determines number of operations executed Programming language, compiler, architecture Determine number of machine instructions executed per operation Processor and memory system Determine how fast instructions are executed I/O system (including OS) Determines how fast I/O operations are executed Chapter 1 Computer Abstractions and Technology 17 Page 17
18 Understanding Performance: ENE 334: Introduction to Digital Computer System Page 18 week #01 Algorithm Determines number of operations executed Programming language, compiler, architecture Determine number of machine instructions executed per operation Processor and memory system Determine how fast instructions are executed I/O system (including OS) Determines how fast I/O operations are executed
19 Below Your Program Application software Written in high-level language System software Compiler: translates HLL code to machine code Operating System: service code Handling input/output Managing memory and storage Scheduling tasks & sharing resources Hardware Processor, memory, I/O controllers 1.2 Below Your Program Chapter 1 Computer Abstractions and Technology 19 Page 19
20 Levels of Program Code High-level language Level of abstraction closer to problem domain Provides for productivity and portability Assembly language Textual representation of instructions Hardware representation Binary digits (bits) Encoded instructions and data Chapter 1 Computer Abstractions and Technology 20 Page 20
21 Level of Program Code: ENE 334: Introduction to Digital Computer System Page 21 week #01
22 Components of a Computer The BIG Picture Same components for all kinds of computer Desktop, server, embedded Input/output includes User-interface devices Display, keyboard, mouse Storage devices Hard disk, CD/DVD, flash Network adapters For communicating with other computers 1.3 Under the Covers Chapter 1 Computer Abstractions and Technology 22 Page 22
23 Different classes of applications: ENE 334: Introduction to Digital Computer System Page 23 June 2nd/ week 8th, #01
24 The five classic components: ENE 334: Introduction to Digital Computer System Page 24 week #01 Memory CPU Control unit Datapath Input/Output
25 Anatomy of a Computer Output device Network cable Input device Input device Chapter 1 Computer Abstractions and Technology 25 Page 25
26 Anatomy of a Mouse Optical mouse LED illuminates desktop Small low-res camera Basic image processor Looks for x, y movement Buttons & wheel Supersedes roller-ball mechanical mouse Chapter 1 Computer Abstractions and Technology 26 Page 26
27 Through the Looking Glass LCD screen: picture elements (pixels) Mirrors content of frame buffer memory Chapter 1 Computer Abstractions and Technology 27 Page 27
28 Opening the Box Chapter 1 Computer Abstractions and Technology 28 Page 28
29 Inside the Processor (CPU) Datapath: performs operations on data Control: sequences datapath, memory,... Cache memory Small fast SRAM memory for immediate access to data Chapter 1 Computer Abstractions and Technology 29 Page 29
30 Inside the Processor AMD Barcelona: 4 processor cores Chapter 1 Computer Abstractions and Technology 30 Page 30
31 Abstractions The BIG Picture Abstraction helps us deal with complexity Hide lower-level detail Instruction set architecture (ISA) The hardware/software interface Application binary interface The ISA plus system software interface Implementation The details underlying and interface Chapter 1 Computer Abstractions and Technology 31 Page 31
32 A Safe Place for Data Volatile main memory Loses instructions and data when power off Non-volatile secondary memory Magnetic disk Flash memory Optical disk (CDROM, DVD) Chapter 1 Computer Abstractions and Technology 32 Page 32
33 Networks Communication and resource sharing Local area network (LAN): Ethernet Within a building Wide area network (WAN: the Internet Wireless network: WiFi, Bluetooth Chapter 1 Computer Abstractions and Technology 33 Page 33
34 Technology Trends Electronics technology continues to evolve Increased capacity and performance Reduced cost DRAM capacity Year Technology Relative performance/cost 1951 Vacuum tube Transistor Integrated circuit (IC) Very large scale IC (VLSI) 2,400, Ultra large scale IC 6,200,000,000 Chapter 1 Computer Abstractions and Technology 34 Page 34
35 Hardware and Software: ENE 334: Introduction to Digital Computer System Page 35 week #01 Coordinate of many levels(layers) of abstraction
36 ENE 334: Introduction to Digital Computer System Page 36 week #01 Historical Perspective: 1/4 During World War II: ENIAC (Electronic Numerical Integrator and Calculator): the world s first operational electronic, general-purpose computer by J. Presper Eckert and John Mauchly at the Moore School of the University of Pennsylvania. (limited primarily by a small amount of storage and tedious programming.)
37 ENE 334: Introduction to Digital Computer System Page 37 week #01 Historical Perspective: 2/4 In 1944: EDVAC (Electronic Discrete Variable Automatic Computer): a storedprogram computer In 1951: UNIVAC I (Universal Automatic Computer), designed to be sold as a general-purpose computer In 1963: CDC 6600, the first supercomputer: the Control Data Corporation
38 ENE 334: Introduction to Digital Computer System Page 38 week #01 Historical Perspective: 3/4 In 1964: the System/360 by IBM In 1971: the Intel 4004, Intel inventing the first microprocessor In 1977: the Apple II
39 Historical Perspective: 4/4 ENE 334: Introduction to Digital Computer System Page 39 week #01
40 ENE 334: Introduction to Digital Computer System Page 40 week #01 Instruction set architraves: 1/7 > Accumulator Architectures: the earliest stored-program computers had a single register for arithmetic instructions. it was called the accumulator add 200 The next step in the evolution of instruction sets was the addition of registers dedicated to specific operations.(ex. Intel 8086) > Extended Accumulator, dedicated register, or specialpurpose register
41 ENE 334: Introduction to Digital Computer System Page 41 week #01 Instruction set architraves: 2/7 > General-Purpose Register Architectures: (Ex. MIPS) a register-memory architecture (Ex. IBM 360) a load-store or a register-register machine memory-memory > Compact Code and Stack Architectures:
42 ENE 334: Introduction to Digital Computer System Page 42 week #01 Instruction set architraves: 3/7 To keep programs small, so machines like the Intel IA-32, IBM 360, and VAX had variable-length instructions, both to match the varying operand specifications and to minimize code size. Intel IA-32 instructions are from 1 to 17 bytes long; IBM 360 instructions are 2, 4, or 6 bytes long; and VAX instruction lengths are anywhere from 1 to 54 bytes. In embedded applications: compact instruction encoding is desirable (for Java bytecode.)
43 ENE 334: Introduction to Digital Computer System Page 43 week #01 Instruction set architraves: 4/7 > High-Level-Language Computer Architectures: More efficient programming languages and compilers, plus expanding memory, doomed this movement to a historical footnote. The Burroughs B5000 was the commercial fountainhead of this philosophy, but today there is no significant commercial descendent of this 1960s radical.
44 ENE 334: Introduction to Digital Computer System Page 44 week #01 Instruction set architraves: 5/7 > Reduced Instruction Set Computer Architectures: Improvements in programming languages, compiler technology, and memory cost meant that less programming was being done at the assembly level, so instruction sets could be measured by how well compilers used them as opposed to how well assembly language programmers used them.
45 ENE 334: Introduction to Digital Computer System Page 45 week #01 Instruction set architraves: 6/7 Virtually all new instruction sets since 1982 have followed this RISC philosophy of fixed instruction lengths, load-store instruction sets, limited addressing modes, and limited operations. ARM, Hitachi SH, IBM PowerPC, MIPS, and Sun SPARC are all examples of RISC architectures.
46 Instruction set architraves: 7/7 ENE 334: Introduction to Digital Computer System Page 46 week #01
47 Defining Performance Which airplane has the best performance? 1.4 Performance Boeing 777 Boeing 777 Boeing 747 BAC/Sud Concorde Douglas DC-8-50 Boeing 747 BAC/Sud Concorde Douglas DC Passenger Capacity Cruising Range (miles) Boeing 777 Boeing 777 Boeing 747 BAC/Sud Concorde Douglas DC-8-50 Boeing 747 BAC/Sud Concorde Douglas DC Cruising Speed (mph) Passengers x mph Chapter 1 Computer Abstractions and Technology 47 Page 47
48 Response Time and Throughput Response time How long it takes to do a task Throughput Total work done per unit time e.g., tasks/transactions/ per hour How are response time and throughput affected by Replacing the processor with a faster version? Adding more processors? We ll focus on response time for now Chapter 1 Computer Abstractions and Technology 48 Page 48
49 Relative Performance Define Performance = 1/Execution Time X is n time faster than Y Performance X Execution time Performance Y Y Execution time X n Example: time taken to run a program 10s on A, 15s on B Execution Time B / Execution Time A = 15s / 10s = 1.5 So A is 1.5 times faster than B Chapter 1 Computer Abstractions and Technology 49 Page 49
50 Measuring Execution Time Elapsed time Total response time, including all aspects Processing, I/O, OS overhead, idle time Determines system performance CPU time Time spent processing a given job Discounts I/O time, other jobs shares Comprises user CPU time and system CPU time Different programs are affected differently by CPU and system performance Chapter 1 Computer Abstractions and Technology 50 Page 50
51 CPU Clocking Operation of digital hardware governed by a constant-rate clock Clock (cycles) Data transfer and computation Update state Clock period Clock period: duration of a clock cycle e.g., 250ps = 0.25ns = s Clock frequency (rate): cycles per second e.g., 4.0GHz = 4000MHz = Hz Chapter 1 Computer Abstractions and Technology 51 Page 51
52 CPU Time CPU Time CPU Clock Cycles Clock Cycle Time CPU Clock Cycles Clock Rate Performance improved by Reducing number of clock cycles Increasing clock rate Hardware designer must often trade off clock rate against cycle count Chapter 1 Computer Abstractions and Technology 52 Page 52
53 CPU Time Example Computer A: 2GHz clock, 10s CPU time Designing Computer B Aim for 6s CPU time Can do faster clock, but causes 1.2 clock cycles How fast must Computer B clock be? Clock Rate Clock Cycles B A Clock Cycles CPU Time CPU Time A B B 1.2 Clock Cycles 6s Clock Rate A A 10s2GHz Clock Rate B s s 9 4GHz Chapter 1 Computer Abstractions and Technology 53 Page 53
54 Instruction Count and CPI ClockCycles CPUTim e Ins truction Count CyclesperIns truction Ins truction Count CPI ClockCycle Tim e Ins truction Count CPI ClockRate Instruction Count for a program Determined by program, ISA and compiler Average cycles per instruction Determined by CPU hardware If different instructions have different CPI Average CPI affected by instruction mix Chapter 1 Computer Abstractions and Technology 54 Page 54
55 CPI Example Computer A: Cycle Time = 250ps, CPI = 2.0 Computer B: Cycle Time = 500ps, CPI = 1.2 Same ISA Which is faster, and by how much? CPUTim e A CPUTim e B CPUTim e B CPUTim e A Ins truction Count CPI Cycle Time A A I ps I500ps Ins truction Count CPI Cycle Time B B I ps I 600ps I 600ps 1.2 I500ps A is faster by this much Chapter 1 Computer Abstractions and Technology 55 Page 55
56 CPI in More Detail If different instruction classes take different numbers of cycles Clock Cycles n i1 (CPIi Instruction Counti ) Weighted average CPI CPI Clock Cycles Instruction Count n i1 CPIi Instruction Counti Instruction Count Relative frequency Chapter 1 Computer Abstractions and Technology 56 Page 56
57 CPI Example Alternative compiled code sequences using instructions in classes A, B, C Class A B C CPI for class IC in sequence IC in sequence Sequence 1: IC = 5 Clock Cycles = = 10 Avg. CPI = 10/5 = 2.0 Sequence 2: IC = 6 Clock Cycles = = 9 Avg. CPI = 9/6 = 1.5 Chapter 1 Computer Abstractions and Technology 57 Page 57
58 Performance Summary The BIG Picture CPU Time Instructions Program Clock cycles Instruction Seconds Clock cycle Performance depends on Algorithm: affects IC, possibly CPI Programming language: affects IC, CPI Compiler: affects IC, CPI Instruction set architecture: affects IC, CPI, T c Chapter 1 Computer Abstractions and Technology 58 Page 58
59 Power Trends 1.5 The Power Wall In CMOS IC technology Power Capacitive load Voltage 2 Frequency 30 5V 1V 1000 Chapter 1 Computer Abstractions and Technology 59 Page 59
60 Reducing Power Suppose a new CPU has 85% of capacitive load of old CPU 15% voltage and 15% frequency reduction 2 Pnew Cold 0.85(Vold 0.85) Fold P C V F old The power wall old We can t reduce voltage further We can t remove more heat old old 0.52 How else can we improve performance? Chapter 1 Computer Abstractions and Technology 60 Page 60
61 Uniprocessor Performance Constrained by power, instruction-level parallelism, memory latency 1.6 The Sea Change: The Switch to Multiprocessors Chapter 1 Computer Abstractions and Technology 61 Page 61
62 Multiprocessors Multicore microprocessors More than one processor per chip Requires explicitly parallel programming Compare with instruction level parallelism Hardware executes multiple instructions at once Hidden from the programmer Hard to do Programming for performance Load balancing Optimizing communication and synchronization Chapter 1 Computer Abstractions and Technology 62 Page 62
63 Manufacturing ICs 1.7 Real Stuff: The AMD Opteron X4 Yield: proportion of working dies per wafer Chapter 1 Computer Abstractions and Technology 63 Page 63
64 AMD Opteron X2 Wafer X2: 300mm wafer, 117 chips, 90nm technology X4: 45nm technology Chapter 1 Computer Abstractions and Technology 64 Page 64
65 Integrated Circuit Cost Costper wafer Costper die Diesper wafer Yield Diesper wafer Wafer area Die area Yield 1 (1 (Defects per area Die area/2)) 2 Nonlinear relation to area and defect rate Wafer cost and area are fixed Defect rate determined by manufacturing process Die area determined by architecture and circuit design Chapter 1 Computer Abstractions and Technology 65 Page 65
66 SPEC CPU Benchmark Programs used to measure performance Supposedly typical of actual workload Standard Performance Evaluation Corp (SPEC) Develops benchmarks for CPU, I/O, Web, SPEC CPU2006 Elapsed time to execute a selection of programs Negligible I/O, so focuses on CPU performance Normalize relative to reference machine Summarize as geometric mean of performance ratios CINT2006 (integer) and CFP2006 (floating-point) n n Execution timeratio i i1 Chapter 1 Computer Abstractions and Technology 66 Page 66
67 CINT2006 for Opteron X Name Description IC 10 9 CPI Tc (ns) Exec time Ref time SPECratio perl Interpreted string processing 2, , bzip2 Block-sorting compression 2, , gcc GNU C Compiler 1, , mcf Combinatorial optimization ,345 9, go Go game (AI) 1, , hmmer Search gene sequence 2, , sjeng Chess game (AI) 2, , libquantum Quantum computer simulation 1, ,047 20, h264avc Video compression 3, , omnetpp Discrete event simulation , astar Games/path finding 1, , xalancbmk XML parsing 1, ,143 6, Geometric mean 11.7 High cache miss rates Chapter 1 Computer Abstractions and Technology 67 Page 67
68 SPEC Power Benchmark Power consumption of server at different workload levels Performance: ssj_ops/sec Power: Watts (Joules/sec) Overall ssj_opsper Watt 10 i0 10 ssj_ops i poweri i0 Chapter 1 Computer Abstractions and Technology 68 Page 68
69 SPECpower_ssj2008 for X4 Target Load % Performance (ssj_ops/sec) Average Power (Watts) 100% 231, % 211, % 185, % 163, % 140, % 118, % 920, % 70, % 47, % 23, % Overall sum 1,283,590 2,605 ssj_ops/ power 493 Chapter 1 Computer Abstractions and Technology 69 Page 69
70 Pitfall: Amdahl s Law Improving an aspect of a computer and expecting a proportional improvement in overall performance T improved Taffected improvement factor T unaffected Example: multiply accounts for 80s/100s How much improvement in multiply performance to get 5 overall? Can t be done! n 1.8 Fallacies and Pitfalls Corollary: make the common case fast Chapter 1 Computer Abstractions and Technology 70 Page 70
71 Fallacy: Low Power at Idle Look back at X4 power benchmark At 100% load: 295W At 50% load: 246W (83%) At 10% load: 180W (61%) Google data center Mostly operates at 10% 50% load At 100% load less than 1% of the time Consider designing processors to make power proportional to load Chapter 1 Computer Abstractions and Technology 71 Page 71
72 Pitfall: MIPS as a Performance Metric MIPS: Millions of Instructions Per Second Doesn t account for Differences in ISAs between computers Differences in complexity between instructions MIPS Instruction count Execution time10 Instruction count Instruction countcpi 10 Clock rate 6 6 Clock rate 6 CPI10 CPI varies between programs on a given CPU Chapter 1 Computer Abstractions and Technology 72 Page 72
73 Concluding Remarks Cost/performance is improving Due to underlying technology development Hierarchical layers of abstraction In both hardware and software Instruction set architecture The hardware/software interface Execution time: the best performance measure Power is a limiting factor Use parallelism to improve performance 1.9 Concluding Remarks Chapter 1 Computer Abstractions and Technology 73 Page 73
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