Activating Computer Architecture with Classroom Presenter

1. Beth Simon University of San Diego Richard Anderson, Steven Wolfman University of Washington Education Technology Activating Computer Architecture withClassroom Presenter Not normal talk Important features of system Basic setup for using system Example of how used in arch class Thank Dean and Larry for architecture slides

2. Classroom Presenter • System to allow for dynamic presentation of PowerPoint-style slides • High-quality Tablet PC-based inking • Wireless network connectivity • Supports separation of views • Instructor has one view on Tablet • Students have a different view on projector • Review of use in a small undergraduate Patterson and Hennessey-style architecture class • Sophomore level, small classes (10-20) Microsoft UW But orig for LARGE class 6,000 undergrads Liberal arts 20 majors a year

3. Basic Class Setup • Instructor has wireless Tablet PC and a “deck” of slides • Prepared in PPT, exported to a Presenter deck • Runs Presenter in “Instructor” mode • Exports deck • “Regular” machine drives projector • Runs Presenter in “Viewer” mode • Requests active deck • Slides are wirelessly transferred to projecting machine • Slide deck on viewer controlled wirelessly by instructor tablet

4. Classroom Presenter Highlights • Spontaneity: • Inking over for emphasis • Providing additional information • Slide shrink • Erasing • Solving problems interactively • Control • Filmstrip and preview • Whiteboard • Instructor Notes • Notes on “how” to explain concept • Answers to problems Demo this LAST:PLUG IN TABLET BEGIN DEMO LAST: Show filmstrip And whiteboard FIRST

5. Time versus throughput • Execution time is measured in time units/job. • For a SINGLE PROGRAM to execute on a system, usually in a dedicated environment • Throughput is measured in jobs/time unit. • Total amount of work (multiple jobs) done by a computer for a given amount of time. • But “time = 1/throughput” may be false. • It takes 4 months to grow a tomato.Can you only grow 3 tomatoes a year ?? NO! • If you run only one job at a time, • time = 1/throughput

6. Time versus throughput • Execution time is measured in time units/job. • For a SINGLE PROGRAM to execute on a system, usually in a dedicated environment • Throughput is measured in jobs/time unit. • Total amount of work (multiple jobs) done by a computer for a given amount of time. • But “time = 1/throughput” may be false. • It takes 4 months to grow a tomato.Can you only grow 3 tomatoes a year ?? NO! • If you run only one job at a time, • time = 1/throughput

7. Start with LEFT INK SAVING SPEC on Pentium III and Pentium 4 ET = IC * CPI * 1/CR -CT:doubling the GHz doesn’t double the SPEC number -IC: Bigger improvement on P4 on FP (SSE/2 instruction set – stack registers to regular FP register set had to recompile to use these instruction sets) • What do you notice?

8. Start with LEFT INK SAVING SPEC on Pentium III and Pentium 4 ET = IC * CPI * 1/CR -CT:doubling the GHz doesn’t double the SPEC number -IC: Bigger improvement on P4 on FP (SSE/2 instruction set – stack registers to regular FP register set had to recompile to use these instruction sets) • What do you notice?

9. Amdahl’s Law Practice • Way cool biological modeling code • 4 days ET on current machine, spends 20% of time doing integer instructions • How much faster must you make the integer unit to make the code run 8 hours faster? ETnew = ETold affected/ speedup + ETold unaffected (96-8) = .2*96/x + (96-.2*96) 88 = 19.2 /x + 76.8 11.2 = 19.2/x X = 1.714 Let’s say original integer unit takes 3ns ET(old) = 1.714*ET(new) X = 1.75ns

10. Amdahl’s Law Practice • Way cool biological modeling code • 4 days ET on current machine, spends 20% of time doing integer instructions • How much faster must you make the integer unit to make the code run 8 hours faster? ETnew = ETold affected/ speedup + ETold unaffected (96-8) = .2*96/x + (96-.2*96) 88 = 19.2 /x + 76.8 11.2 = 19.2/x X = 1.714

11. LW inst DISP empty lw without the displacement Red:PC Blue: Dest Green: Source 9 control lines: You must show values for all What if I want to Support both styles of lw/sw? Jump Branch MemRead MemWrite 0 0 1 0 ALUSrc ALUOp MemToReg RegWrite RegDest X X 1 1 0

12. LW inst DISP empty lw without the displacement Red:PC Blue: Dest Green: Source 9 control lines: You must show values for all What if I want to Support both styles of lw/sw? Jump Branch MemRead MemWrite 0 0 1 0 ALUSrc ALUOp MemToReg RegWrite RegDest X X 1 1 0

13. Upcoming Classroom Presenter Features • Private Inking • Notes you take to yourself in class • Additional instructor notes off-screen • Pulled directly from PPT notes field • Shown filmstrip-view style • Tablets for Students • Group problem solving • Quick display and markup • Wireless Projectors • Large Classroom-specific • Classroom Feedback System (implemented) • Structured Interaction Some avail, not sure of interface

14. Where to get it: • Download Presenter from: • http://www.cs.washington.edu/education/dl/presenter/ • 1.1.03 most stable • No integrated instructor mode objects • Personally had few problems with Integrated IMode and PPT add in • Toolbar changes won’t stay • Please register with wolf@cs.washington.edu • Acknowledgements: • UW Educational Technology Group (Richard Anderson) Demo PPT? Review 4 view modes