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CIS 571: Introduction to Computer Organization & Design, Lecture notes of Design

Design

Textbooks (none required). • Patterson & Hennessy, Computer Organization and Design, 4th or. 5th edition. • free via Penn library, link on course homepage.

Typology: Lecture notes

2021/2022

Uploaded on 08/05/2022

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CIS 571
Computer Organization & Design
Unit 1: Introduction
Slides developed by Joseph Devietti, Benedict Brown, C.J. Taylor, Milo Martin & Amir Roth
at the University of Pennsylvania
with sources that included University of Wisconsin slides
by Mark Hill, Guri Sohi, Jim Smith, and David Wood.
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CIS 571

Computer Organization & Design

Unit 1: Introduction

Slides developed by Joseph Devietti, Benedict Brown, C.J. Taylor, Milo Martin & Amir Roth at the University of Pennsylvania with sources that included University of Wisconsin slides by Mark Hill, Guri Sohi, Jim Smith, and David Wood.

Today’s Agenda

  • Course logistics
  • A brief history of computer architecture
  • Lab Demo

Course Staff

  • Instructor
    • Joe Devietti (devietti@cis)
  • TAs
    • Elijah Magerman
    • Amelia Rosenbaum
    • Lindsay Smith
    • Matthew Tang
    • Zhiyao Tang
    • Alexandra Tanner

Course Number

  • 371/501 => 471/
  • No difference in content between 471 and 571
    • I’ll just say “571” for short

Course Resources

  • Course website
    • http://www.cis.upenn.edu/~cis
    • slides (publicly accessible)
  • Github
    • documentation and starter code for the labs
  • Canvas
    • regular quizzes
    • lecture videos available via Class Recordings tab
  • Gradescope
    • submit labs
  • Piazza Ed Discussions
    • private and anonymous-to-students posts/questions
    • As a general rule, don’t use email
  • Office Hours
    • ohq + Zoom
    • Google Calendar with OH time slots and links

Course Resources

  • biglab.seas.upenn.edu
    • build & run your lab code
  • Textbooks (none required)
    • Patterson & Hennessy, Computer Organization and Design, 4 th or 5 th edition
  • free via Penn library, link on course homepage
    • Reese & Thornton, Intro to Logic Synthesis using Verilog HDL
      • PDF on Canvas in the Files tab
    • Digital Design: A Systems Approach by Dally and Harting

Lab Logistics

  • Tools
    • Icarus Verilog, Xilinx Vivado hardware compilers
      • Run from biglab.seas.upenn.edu
    • ZedBoard FPGA boards
      • Live in Towne lockers, details coming
  • Logistics
    • Most labs have a demo component that runs on the ZedBoard
    • Development and simulation can be done before final testing on the board

Labs

  • Labs 2-5 done in groups of two
    • start forming groups now
    • join an existing Canvas group with your partner
  • Lab descriptions
    • Lab 1: Verilog debugging
    • Lab 2: arithmetic & logical unit
    • Lab 3: single-cycle LC4 & register file
    • Lab 4: pipelined LC
    • Lab 5: pipelined +superscalar LC
  • Labs are cumulative and increasingly complex
  • Each lab broken down into "milestone" deadlines
    • Roughly one per week
  • Threshold grading : grades are [0%,90%] or 100%

In many ways this

is a class about

debugging

http://debuggingrules.com

Grading

  • Tentative grade contributions:
    • Quizzes: 30 %
    • Labs: 70%
  • Historical grade distribution: median grade is B+
    • past performance is not a predictor of future results

Academic Misconduct

  • Cheating will not be tolerated
  • General rule:
    • Anything with your name on it must be YOUR OWN work
    • You MUST scrupulously credit all sources of help
    • Example: individual work on homework assignments
  • See the course policies
  • Penn’s Code of Conduct
    • http://www.vpul.upenn.edu/osl/acadint.html

Computer Architecture Courses @ Penn

CIS 240 vs. CIS 571

  • CIS 240
    • Focus on one toy ISA: LC
    • Focus on functionality: “just get something that works”
    • Instructive, learn to crawl before you can walk
    • Not representative of real machines: 240 hardware is circa 1975
  • CIS 571
    • Less emphasis on any particular ISA during lectures
    • Focus on quantitative aspects: performance , cost, power, etc.
    • Representative of ~1980s hardware
      • also modern low-power processors, e.g., inside a Fitbit

Pervasive Idea: Abstraction and Layering

  • Abstraction : only way of dealing with complex systems
    • Divide world into objects, each with an…
      • Interface : knobs, behaviors, knobs ® behaviors
      • Implementation : “black box” (ignorance+apathy)
    • Only specialists deal with implementation, rest of us with interface
    • Example: only mechanics know how cars work
  • Layering : abstraction discipline makes life even simpler
    • Divide objects in system into layers, layer n objects…
      • Implemented using interfaces of layer n – 1
      • (mostly) Don’t need to know interfaces of layer n – 2
  • Inertia : a dark side of layering
    • Layer interfaces become entrenched over time (“standards”)
    • Very difficult to change even if benefit is clear
  • Opacity : hard to reason about performance across layers