Operating Systems COT 4600 – Fall 2009 Dan C. Marinescu Office: HEC 439 B Office hours: Tu, Th 3:00-4:00 PM.

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Presentation transcript:

Operating Systems COT 4600 – Fall 2009 Dan C. Marinescu Office: HEC 439 B Office hours: Tu, Th 3:00-4:00 PM

Slides by Kaashoek & Morris Last time: Systems and Complexity Sources of Complexity Today Knowledge and ethics. Modularity, Abstractions, Layering, Hierarchy (slides from Lecture 1) Computer Systems (slides by Kaashoek & Morris) Next time: Computer Systems versus Other Systems Coping with Computer System Complexity

Slides by Kaashoek & Morris Composibility via static discipline Be tolerant of inputs and strict on outputs

Slides by Kaashoek & Morris Moore’s law “Cramming More Components Onto Integrated Circuits”, Electronics, April 1965 cost per transistor transistors per die

Slides by Kaashoek & Morris Transistors/die doubles every ~18 months

Slides by Kaashoek & Morris Lithography: the driver behind transistor count Components/area O(x 2 ) with feature size Total components O(a) with die area Switching rate O(x) with feature size

Slides by Kaashoek & Morris CPU performance

Slides by Kaashoek & Morris DRAM density

Slides by Kaashoek & Morris Disk: Price per GByte drops at ~30-35% per year

Slides by Kaashoek & Morris ENIAC 1946 Only one built 5000 adds/sec digit registers 18,000 vacuum tubes 124,500 watts Not really stored program

Slides by Kaashoek & Morris UNIVAC (Universal Automatic Computer) sold 2000 ops/sec 1, digit words (mercury) 5000 tubes $1.5 million

Slides by Kaashoek & Morris IBM System/ MHz KB core $225,000 Family of six 32-bit Time-sharing

Slides by Kaashoek & Morris Cray 1: supercomputer sold 80 MHz 8 Mbyte SRAM 230,000 gates $5 million

Slides by Kaashoek & Morris DEC PDP-8 (1964) 60,000 sold 330,000 adds/sec bit words $18,000

Slides by Kaashoek & Morris Apple II MHz 6502 microprocessor 4 to 48 Kilobytes RAM $1300 Basic, Visicalc

Slides by Kaashoek & Morris IBM’s wrist watch 2001 Linux and X11 74 Mhz CPU 8 Megabyte flash 8 Megabyte DRAM Wireless

Slides by Kaashoek & Morris Software follows hardware Millions of lines of source code

Slides by Kaashoek & Morris Cheap  Pervasive

Slides by Kaashoek & Morris Pervasive  qualitative change year log (people per computer) Slide from David Culler, UC Berkeley Number crunching Embedded Sense/control Word processing Communication

Slides by Kaashoek & Morris Latency improves slowly Year # Improvement wrt year #1 Moore’s law (~70% per year) DRAM access latency (~7% per year) Speed of light (0% per year)

Slides by Kaashoek & Morris Heat is a problem

Slides by Kaashoek & Morris Recent Intel CPU Clock Rates 486 Pentium PentiumPro Pentium III Pentium 4 Pentium 4 HT mHz

Slides by Kaashoek & Morris The Future: will it be painful? AMD Barcelona Quad-core chip

Slides by Kaashoek & Morris What went right? Unbounded composibility General-purpose computers Only need to make one thing fast Separate architecture from implementation S/W can exploit new H/W Cumulative R&D investment over years