1. Invited Talk 5: “Discovering Energy-Efficient High-Performance Computing Systems? WSU CAPPLab may help!” ICIEV 2014 Dhaka, Bangladesh Dr. Abu Asaduzzaman, Assistant Professor and Director Wichita State University (WSU) Computer Architecture & Parallel Programming Laboratory (CAPPLab) Wichita, Kansas, USA May 23, 2014

2. Dr. Zaman2 “Discovering Energy-Efficient High-Performance Computing Systems? WSU CAPPLab may help!” Outline► ■Introduction  Single-Core to Multicore Architectures ■Performance Improvement  Simultaneous Multithreading (SMT)  (SMT enabled) Multicore CPU with GPUs ■Energy-Efficient Computing  Dynamic GPU Selection ■CAPPLab  “People First”  Resources  Research Grants/Activities ■Discussion QUESTIONS? Any time, please!

3. Dr. Zaman3 Introduction Single-Core to Multicore Architecture ■History of Computing  Word “computer” in 1613 (this is not the beginning)  Von Neumann architecture (1945) – data/instructions memory  Harvard architecture (1944) – data memory, instruction memory ■Single-Core Processors  In most modern processors: split CL1 (I1, D1), unified CL2, …  Intel Pentium 4, AMD Athlon Classic, … ■Popular Programming Languages  C, …

4. Dr. Zaman4 (Single-Core to) Multicore Architecture Courtesy: Jernej Barbič, Carnegie Mellon University  Input  Process/Store  Output Multi-tasking  Time sharing (Juggling!) Cache not shown Introduction

5. Dr. Zaman5 Single-Core  “Core” Introduction a single core Courtesy: Jernej Barbič, Carnegie Mellon University A thread is a running “process”

6. Dr. Zaman6 Introduction Thread 1: Integer (INT) Operation (Pipelining Technique) 1: Instruction Fetch 2: Instruction Decode (3) Operand(s) Fetch 4: Integer Operation Arithmetic Logic Unit (5) Result Write Back Floating Point Operation Thread 1: Integer Operation

7. Dr. Zaman7 Introduction Thread 2: Floating Point (FP) Operation (Pipelining Technique) Instruction Fetch Instruction Decode Operand(s) Fetch Integer Operation Arithmetic Logic Unit Result Write Back Floating Point Operation Thread 2: Floating Point Operation

8. Dr. Zaman8 Introduction Threads 1 and 2: INT and FP Operations (Pipelining Technique) Instruction Fetch Instruction Decode Operand(s) Fetch Integer Operation Arithmetic Logic Unit Result Write Back Floating Point Operation Thread 1: Integer Operation Thread 2: Floating Point Operation POSSIBLE?

9. Dr. Zaman9 Performance Threads 1 and 2: INT and FP Operations (Pipelining Technique) Instruction Fetch Instruction Decode Operand(s) Fetch Integer Operation Arithmetic Logic Unit Result Write Back Floating Point Operation Thread 1: Integer Operation Thread 2: Floating Point Operation POSSIBLE?

10. Dr. Zaman10 Performance Improvement Threads 1 and 3: Integer Operations Instruction Fetch Instruction Decode Operand(s) Fetch Integer Operation Arithmetic Logic Unit Result Write Back Floating Point Operation Thread 1: Integer Operation Thread 3: Integer Operation POSSIBLE?

11. Dr. Zaman11 Performance Improvement Threads 1 and 3: Integer Operations (Multicore) Instruction Fetch Instruction Decode Operand(s) Fetch Integer Operation Arithmetic Logic Unit Result Write Back Floating Point Operation Instruction Fetch Instruction Decode Operand(s) Fetch Integer Operation Arithmetic Logic Unit Result Write Back Floating Point Operation Thread 1: Integer Operation Thread 3: Integer Operation POSSIBLE? Core 1 Core 2

12. Dr. Zaman12 Performance Improvement Threads 1, 2, 3, and 4: INT & FP Operations (Multicore) Instruction Fetch Instruction Decode Operand(s) Fetch Integer Operation Arithmetic Logic Unit Result Write Back Floating Point Operation Instruction Fetch Instruction Decode Operand(s) Fetch Integer Operation Arithmetic Logic Unit Result Write Back Floating Point Operation Core 2 Thread 1: Integer Operation Thread 3: Integer Operation Thread 4: Floating Point Operation Thread 2: Floating Point Operation POSSIBLE? Core 1

13. Dr. Zaman13 More Performance? Threads 1, 2, 3, and 4: INT & FP Operations (Multicore) Instruction Fetch Instruction Decode Operand(s) Fetch Integer Operation Arithmetic Logic Unit Result Write Back Floating Point Operation Instruction Fetch Instruction Decode Operand(s) Fetch Integer Operation Arithmetic Logic Unit Result Write Back Floating Point Operation Core 2 Thread 1: Integer Operation Thread 3: Integer Operation Thread 4: Floating Point Operation Thread 2: Floating Point Operation POSSIBLE? Core 1

14. Dr. Zaman14 “Discovering Energy-Efficient High-Performance Computing Systems? WSU CAPPLab may help!” Outline► ■Introduction  Single-Core to Multicore Architectures ■Performance Improvement  Simultaneous Multithreading (SMT)  (SMT enabled) Multicore CPU with GPUs ■Energy-Efficient Computing  Dynamic GPU Selection ■CAPPLab  “People First”  Resources  Research Grants/Activities ■Discussion

15. Dr. Zaman15 Parallel/Concurrent Computing Parallel Processing – It is not fun!  Let’s play a game: Paying the lunch bill together  Started with $30; spent $29 ($27 + $2)  Where did $1 go? FriendBefore Eating Total Bill ReturnTipAfter Paying A$10$1 B$10$25$5$2$1 C$10$1 Total$30$2 Total Spent $9 $27 SMT enabled Multicore CPU with Manycore GPU for Ultimate Performance!

16. Dr. Zaman16 Performance Improvement Simultaneous Multithreading (SMT) ■Thread  A running program (or code segment) is a process  Process  processes / threads ■Simultaneous Multithreading (SMT)  Multiple threads running in a single-processor at the same time  Multiple threads running in multiple processors at the same time ■Multicore Programming Language supports  OpenMP, Open MPI, CUDA,…C

17. Dr. Zaman17 Identify Challenges ■Sequential data-independent problems  C[]  A[] + B[] ♦C[5]  A[5] + B[5]  A’[]  A[] ♦A’[5]  A[5]  SMT capable multicore processor; CUDA/GPU Technology Core 1Core 2 Performance Improvement

18. Dr. Zaman18 ■CUDA/GPU Programming ■GP-GPU Card  A GPU card with 16 streaming multiprocessors (SMs)  Inside each SM: 32 cores 64KB shared memory 32K 32bit registers 2 schedulers 4 special function units ■CUDA  GPGPU Programming Platform Performance Improvement

19. Dr. Zaman19 Performance Improvement CPU-GPU Technology ■Tasks/Data exchange mechanism  Serial Computations – CPU  Parallel Computations - GPU

20. Dr. Zaman20 Performance Improvement GPGPU/CUDA Technology ■The host (CPU) executes a kernel in GPU in 4 steps (Step 1) CPU allocates and copies data to GPU On CUDA API: cudaMalloc() cudaMemCpy()

21. Dr. Zaman21 Performance Improvement GPGPU/CUDA Technology ■The host (CPU) executes a kernel in GPU in 4 steps (Step 2) CPU Sends function parameters and instructions to GPU CUDA API: myFunc >>(parameters)

22. Dr. Zaman22 Performance Improvement GPGPU/CUDA Technology ■The host (CPU) executes a kernel in GPU in 4 steps (Step 3) GPU executes instruction as scheduled in warps (Step 4) Results will need to be copied back to Host memory (RAM) using cudaMemCpy()

23. Dr. Zaman23 Performance Improvement Case Study 1 (data independent computation without GPU/CUDA) ■Matrix Multiplication MatricesSystems

24. Dr. Zaman24 Performance Improvement Case Study 1 (data independent computation without GPU/CUDA) ■Matrix Multiplication Execution TimePower Consumption

25. Dr. Zaman25 Performance Improvement Case Study 2 (data dependent computation without GPU/CUDA) ■Heat Transfer on 2D Surface Execution TimePower Consumption

26. Dr. Zaman26 Performance Improvement Case Study 3 (data dependent computation with GPU/CUDA) ■Fast Effective Lightning Strike Simulation  The lack of lightning strike protection for the composite materials limits their use in many applications.

27. Dr. Zaman27 Performance Improvement Case Study 3 (data dependent computation with GPU/CUDA) ■Fast Effective Lightning Strike Simulation ■Laplace’s Equation ■Simulation  CPU Only  CPU/GPU w/o shared memory  CPU/GPU with shared memory

28. Dr. Zaman28 Performance Improvement Case Study 4 (MATLAB Vs GPU/CUDA) ■Different simulation models  Traditional sequential program  CUDA program (no shared memory)  CUDA program (with shared memory)  Traditional sequential MATLAB  Parallel MATLAB  CUDA/C parallel programming of the finite difference method based Laplace’s equation demonstrate up to 257x speedup and 97% energy savings over a parallel MATLAB implementation while solving a 4Kx4K problem with reasonable accuracy.

29. Dr. Zaman29 Identify More Challenges ■Sequential data-independent problems  C[]  A[] + B[] ♦C[5]  A[5] + B[5]  A’[]  A[] ♦A’[5]  A[5]  SMT capable multicore processor; CUDA/GPU Technology ■Sequential data-dependent problems  B’[]  B[] ♦B’[5]  {B[4], B[5], B[6]}  Communication needed ♦Core 1 and Core 2 Core 1Core 2 Performance Improvement

30. Dr. Zaman30 Develop Solutions ■Task Regrouping  Create threads ■Data Regrouping  Regroup data  Data for each thread  Threads with G2s first  Then, threads with G1s (Step 2 of 5) CPU copies data to GPU On CUDA API: cudaMemCpy() Performance Improvement

31. Dr. Zaman31 Assess the Solutions ■What is the Key? ■Synchronization  With synchronization  Without synchronization ♦Fast Vs. Accuracy  Threads with G2s first  Then, threads with G1s (Step 2 of 5) CPU copies data to GPU On CUDA API: cudaMemCpy() Performance Improvement

32. Dr. Zaman32 “Discovering Energy-Efficient High-Performance Computing Systems? WSU CAPPLab may help!” Outline► ■Introduction  Single-Core to Multicore Architectures ■Performance Improvement  Simultaneous Multithreading (SMT)  (SMT enabled) Multicore CPU with GP-GPU ■Energy-Efficient Computing  Dynamic GPU Selection ■CAPPLab  “People First”  Resources  Research Grants/Activities ■Discussion

33. Dr. Zaman33 Kansas Unique Challenge ■Climate and Energy  Protect environment from harms due to climate change  Save natural energy Energy-Efficient Computing

34. Dr. Zaman34 “Power” Analysis ■CPU with multiple GPU  GPU usages vary ■Power Requirements  NVIDIA GTX 460 (336-core) - 160W [1]  Tesla C2075 (448-core) - 235W [2]  Intel Core i7 860 (4-core, 8-thread) - 150-245W [3, 4] ■Dynamic GPU Selection  Depending on ♦the “tasks”/threads ♦GPU usages CPU GPU Energy-Efficient Computing

35. Dr. Zaman35 CPU-to-GPU Memory Mapping ■GPU Shared Memory  Improves performance  CPU to GPU global memory  GPU global to shared ■Data Regrouping  CPU to GPU global memory Energy-Efficient Computing

36. Dr. Zaman36 Integrate Research into Education ■CS 794 – Multicore Architectures Programming  Multicore Architecture  Simultaneous Multithreading  Parallel Programming  Moore’s law  Amdahl’s law  Gustafson’s law  Law of diminishing returns  Koomey's law Teaching Low-Power HPC Systems

37. Dr. Zaman37 “Discovering Energy-Efficient High-Performance Computing Systems? WSU CAPPLab may help!” Outline► ■Introduction  Single-Core to Multicore Architectures ■Performance Improvement  Simultaneous Multithreading (SMT)  (SMT enabled) Multicore CPU with GP-GPU ■Energy-Efficient Computing  Dynamic GPU Selection ■CAPPLab  “People First”  Resources  Research Grants/Activities ■Discussion

38. Dr. Zaman38 WSU CAPPLab CAPPLab ■Computer Architecture & Parallel Programming Laboratory (CAPPLab)  Physical location: 245 Jabara Hall, Wichita State University  URL: http://www.cs.wichita.edu/~capplab/http://www.cs.wichita.edu/~capplab/  E-mail: capplab@cs.wichita.edu; Abu.Asaduzzaman@wichita.educapplab@cs.wichita.eduAbu.Asaduzzaman@wichita.edu  Tel: +1-316-WSU-3927 ■Key Objectives  Lead research in advanced-level computer architecture, high- performance computing, embedded systems, and related fields.  Teach advanced-level computer systems & architecture, parallel programming, and related courses.

39. Dr. Zaman39 WSU CAPPLab “People First” ■Students  Kishore Konda Chidella, PhD Student  Mark P Allen, MS Student  Chok M. Yip, MS Student  Deepthi Gummadi, MS Student ■Collaborators  Mr. John Metrow, Director of WSU HiPeCC  Dr. Larry Bergman, NASA Jet Propulsion Laboratory (JPL)  Dr. Nurxat Nuraje, Massachusetts Institute of Technology (MIT)  Mr. M. Rahman, Georgia Institute of Technology (Georgia Tech)  Dr. Henry Neeman, University of Oklahoma (OU)

40. Dr. Zaman40 WSU CAPPLab Resources ■Hardware  3 CUDA Servers – CPU: Xeon E5506, 2x 4-core, 2.13 GHz, 8GB DDR3; GPU: Telsa C2075, 14x 32 cores, 6GB GDDR5 memory  2 CUDA PCs – CPU: Xeon E5506, …  Supercomputer (Opteron 6134, 32 cores per node, 2.3 GHz, 64 GB DDR3, Kepler card) via remote access to WSU (HiPeCC)  2 CUDA enabled Laptops  More … ■Software  CUDA, OpenMP, and Open MPI (C/C++ support)  MATLAB, VisualSim, CodeWarrior, more (as may needed)

41. Dr. Zaman41 WSU CAPPLab Scholarly Activities ■WSU became “CUDA Teaching Center” for 2012-13  Grants from NSF, NVIDIA, M2SYS, Wiktronics  Teaching Computer Architecture and Parallel Programming ■Publications  Journal: 21 published; 3 under preparation  Conference: 57 published; 2 under review; 6 under preparation  Book Chapter: 1 published; 1 under preparation ■Outreach  USD 259 Wichita Public Schools  Wichita Area Technical and Community Colleges  Open to collaborate

42. Dr. Zaman42 WSU CAPPLab Research Grants/Activities ■Grants  WSU: ORCA  NSF – KS NSF EPSCoR First Award  M2SYS-WSU Biometric Cloud Computing Research Grant  Teaching (Hardware/Financial) Award from NVIDIA  Teaching (Hardware/Financial) Award from Xilinx ■Proposals  NSF: CAREER (working/pending)  NASA: EPSCoR (working/pending)  U.S.: Army, Air Force, DoD, DoE  Industry: Wiktronics LLC, NetApp Inc, M2SYS Technology

43. Thank You! Contact: Abu Asaduzzaman E-mail: abuasaduzzaman@ieee.org Phone: +1-316-978-5261 http://webs.wichita.edu/aasaduzzaman/ http://www.cs.wichita.edu/~capplab/ “Discovering Energy-Efficient High-Performance Computing Systems? WSU CAPPLab may help!”