EE382N-20 Computer Architecture Parallelism and Locality Lecture 1

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1 EE Computer Architecture Parallelism and Locality Lecture 1 Mattan Erez The University of Texas at Austin EE382-20: Lecture 1 (c) Mattan Erez

2 What is this class about? Computer architecture Principles in computer architecture Parallelism Locality Hierarchy EE382-20: Lecture 1 (c) Mattan Erez

3 What is this class about? Computer architecture Principles in computer architecture Parallelism Locality Hierarchy Advanced class computer architecture Problems Principles Solutions Get some original research started EE382-20: Lecture 1 (c) Mattan Erez

4 Outline (for today) Quick intro to computer architecture What is it What are the main challenges today What are parallelism, locality, and hierarchy Why are they principles How do they address the challenges Topics we ll cover in class Class procedures and expectations Other technicalities EE382-20: Lecture 1 (c) Mattan Erez

5 What is Architecture? Form follows function Louis Sullivan EE382-20: Lecture 1 (c) Mattan Erez

6 Computer Architects Match Hardware Technology with User Requirements EE382-20: Lecture 1 (c) Mattan Erez

7 Computer Architects Match Hardware Technology with User Requirements EE382-20: Lecture 1 (c) Mattan Erez

8 Computer Architects Match Hardware Technology with User Requirements EE382-20: Lecture 1 (c) Mattan Erez

9 Computer Architects Match Hardware Technology with User Requirements EE382-20: Lecture 1 (c) Mattan Erez

10 Computer Architects Match Hardware Technology with User Requirements EE382-20: Lecture 1 (c) Mattan Erez

11 Computer Architects Match Hardware Technology with User Requirements EE382-20: Lecture 1 (c) Mattan Erez

12 Computer Architects Match Hardware Technology with User Requirements EE382-20: Lecture 1 (c) Mattan Erez

13 Computer Architects Match Hardware Technology with User Requirements EE382-20: Lecture 1 (c) Mattan Erez

14 Computer Architects Match Hardware Technology with User Requirements compiler EE382-20: Lecture 1 (c) Mattan Erez

15 Computer Architects Match Hardware Technology with User Requirements compiler EE382-20: Lecture 1 (c) Mattan Erez

16 Five major Challenges for Computer Architects The number of people saying Moore s Law is dead doubles every 18 months

17 The Performance Challenge Wireless communications (3G, UWB, ) Higher data rates More complex air interfaces Workstations (Games, CAD) Supercomputers (Scientific simulations) Fidelity Time scales Higher resolution Realism Accuracy EE382-20: Lecture 1 (c) Mattan Erez

18 The (Power) Efficiency Challenge Embedded Mainstream CPUs Supercomputers Battery life and heat Commodity and volume Peak power Cooling Energy bill (10 MW) Price/performance EE382-20: Lecture 1 (c) Mattan Erez

19 The Practicality Challenge Verification? Place & Rout billions of devices? Manufacturability Existing software and tools EE382-20: Lecture 1 (c) Mattan Erez

20 The Programmability Challenge Programmability reduces cost, enables adaptation, and improves time-to-market Multiple modes Evolving standards Evolving features, differentiation Design/tooling costs EE382-20: Lecture 1 (c) Mattan Erez

21 The Reliability Challenge More devices Smaller devices Greater variability source n drain EE382-20: Lecture 1 (c) Mattan Erez

22 What can we do? Specialize more But still innovate on algorithms Compute less and store less Use better algorithms Proportionality: waste less Different applications and scenarios have different requirements Main ways to save: locality, parallelism, and hierarchy EE382-20: Lecture 1 (c) Mattan Erez

23 Overall Approach Application layer: numerical methods, DSLs Portability and tuning layer Portability and tuning layer: HW-aware Automatic abstractions for power, BW, performance abstractions transformations Architecture layer: mechanisms Physical component layer: power, bandwidth, performance EE382-20: Lecture 1 (c) Mattan Erez

24 But first To get an A, you will have to put in effort I will be less lenient than historical evidence suggests, especially w.r.t. final project Work will be open-ended You ll have to figure out what to do on your own You ll have to figure out how to do it You ll have to decide what is good enough for you Lab 1 is already out It will take time It s the easiest because most spelled out Work in groups Groups of 3 ideal and expected (see me for rare exceptions) Switch teams for the 3 labs plenty of great people here EE382-20: Lecture 1 (c) Mattan Erez

25 Outline (for today) Quick intro to computer architecture What is it What are the main challenges today What are parallelism, locality, and hierarchy Why are they principles How do they address the challenges Topics we ll cover in class Class procedures and expectations Other technicalities Rest of class was on the whiteboard EE382-20: Lecture 1 (c) Mattan Erez

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