Processors - an overview

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  • Modern x86 architecture based chip
  • Church–Turing thesis: a function is algorithmically computable w. a Turing Machine
  • Processors - an overview

    1. 1. Processor Architectures Lorenz Sauer 2003/04
    2. 2. Synopsis History of Computing Principal Architecture  Von Neuman Architecture  RISC, CISC, VLIW  SIMD, SISD, MISD, MIMD• Survey• Outlook
    3. 3. History of Computing 1st Switches 2nd Binary Theory (comprehensive)  Implemented as:  Tubes  Transistor  BiPolar  FET (especially MOSFET)  Future (DNA,...)
    4. 4. Hardware-means to the end... Tube Technology  huge, high power dissipation, very slow Transistor  First models: huge  Minaturization: rapidly  BiPolar: fast, decent power dissipation  FET: decent speed, low power dissipation, extreme Intregration Density is possible
    5. 5. Computing Timetable 1949 John von Neumann 1970s first microprocessor machines 1980s IBM PC settling in industry 1990s large-scale mainframes 2000s GRID, interconnected computing >2000
    6. 6. History: VisiCalc the Killer App 1979: First released with Apple II 1981: Ported to IBM PCs Convinces the „industry„ of IBM PCs New mainstream market born Still executable 27.520bytes of Spreadsheetness
    7. 7. Principal Architecture: Basics Processor or Central Processing Unit  CPU is the heart of a computer  Execute programs stored in main memory  Instructions are processed sequentially:  fetched, examined and executed  Church–Turing thesis  The CPU is composed of:  Control Unit  Arithmetic logic unit (ALU)  Registers
    8. 8. Principal Architecture Central Unit CPU (Central Processing Unit) Calculator Controller ALU CU (Arithmetical Logical Unit) (Control Unit) Bus System Memory Input/Output (Addressing Unit) (IO Unit)
    9. 9. Instruction Execution Pure VN(Von Neuman)-Execution Model  Nowadays few computers employ pure von Neumann architecture  No Check for Interrupts  Pure VN computers spend a lot of time moving data from and to memory  So called “Neumann bottleneck“
    10. 10. Instruction Execution Advanced VN Model(s)  Interrupt built in  Bus Architecture extended over several busses (different stepping possible)  Pipelining  Caching  Co-Processor (Math, DSP,..)  Parallelization of Units
    11. 11. Example of Advanced VN Model Central Unit CPU (Cent ral P rocessing Unit ) Calculator Register set Controller Addressing ALU AU CU (Arit hmet ical Logical (Regist er File) (Cont rol Unit ) (Address Unit ) Unit ) L1-Cache BIU (Bus Int erface Unit ) Controlbus Databus Addressbus
    12. 12. The Instruction Set Instruction set:  “Collection of all instructions used to communicate with the CPU“  sizes vary from 20 to 300+ instructions  Determined upon the type of machine  larger instruction sets not necessarily better  tailored to the use (of the processor) Compilers generate many machine instructions (Ops) from a highlevel language statement Most common are: CISC, RISC, VLIW  Complex / Reduced instruction set computing, VLIW ~long instructions used in parallelism: see MIMD
    13. 13. Processor: Typical Architectures SISD S...Single MISD M...Multiple SIMD I...Instruction D...Data MIMD
    14. 14. SISD Single Instruction Single Data Almost any conventional PC is SISD VN-model is a pure SISD
    15. 15. MISD Multiple Instruction Single Data No commercial success Example: Systolic Processor
    16. 16. SIMD Single Instruction Multiple Data Executes operations in parallel Example: Vector computer aka Array computer (~history of supercomputers) Nowadays as SIMD extensions Speeds up certain applications: chiefly multimedia (~rich in single precision floating point data)
    17. 17. MIMD Multiple Instruction Multiple Data Parallel architecture Many functional units Performs different operations on seperate data Example: Multiprocessor, interconnected workstations
    18. 18. Other: Vector-, Array-Processor Common in supercomputers till 1980s performs operations in parallel Copes well with large data chunks Bad under general purpose conditions Nowadays in PC-CPUs as SIMD
    19. 19. Other: Artificial Neural Processor Employed for pattern recognition Artificial Neural Network(ANN) model mutually linked, homogeneous processing units Units perform basic ANN operations:  Threshold calculation  Weighting  Addition,....
    20. 20. Other: Parallel Reduction Machine Simplification of expressions Expressions reshaped into smaller, partial ones Obtained through recursion of partial expressions Performs reduction programs String reduction vs. Graph reduction machines
    21. 21. Other: Systolic Processor Array of Processing units (Cells) Single cell trivial Relay data via n - I/O Structure: Rectangular, Hexagonal or triangular Elements process same calculation Edge cells are the main I/O
    22. 22. Other: Fuzzy Processor Based on fuzzy logic  many-valued logic or probabilistic logic  approximate values rather than fixed (0|1)  “set of approximate rules”-logic:  IF variable IS ~property THEN response 1  IF variable IS >>property THEN response 2 Examples:  Washing maschines,Auto focus,...
    23. 23. Other: Digital Signal Processor Used for very specific tasks Implements algorithms in Hardware Very fast at specific tasks Useless for general purpose programs Sufficient for some applications  Can lower overall costs
    24. 24. Survey: GRID Computing Used in scenarios to big for single supercomputers Heterogenous structure  Heterogenous computer-hardware / software and structure scattered around the globe Common middleware necessary  E.g. Globus Toolkit 2 Types, determined by their use:  Computation Grids  Data Grids Examples:  SETI Project, @Folding: Protein folding...
    25. 25. Outlook Processor Optimization DNA Computer Quantum Computer
    26. 26. Outlook: Processor Optimization Clock Speeds Minaturization Improved & extended architecture Compilers (good at trvial tasks, fail at more complicated and parallel tasks) Non-trivial to determine the use of instruction extensions Most unit extensions are not used
    27. 27. Outlook: DNA Computer Concept from 1994 DNA used as logical gates Input: Code as genetic fragments Output: spliced fragments More or less theoretical (as of yet) Estimated to surpass any conventional PC in some bioinformatic tasks
    28. 28. Outlook: Quantum Computer 1981: Quantum computer theory Bits vs QBits Difficult to generate and maintain, due to outside effects 8 bit Computer is in 1 state of 256 8 Qbit Computer is in n state(s) of 256  Superposition of states Quantum parallelism All values exist; a single value is determined at the time of measurement 10Qbit computer could surpass a supercomputer Problems of error correction and calculation reliability

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