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OpenACC for Programmers: Concepts and Strategies

OpenACC for Programmers: Concepts and Strategies

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  • Copyright 2018
  • Dimensions: 7-3/8" x 9-1/8"
  • Edition: 1st
  • eBook (Watermarked)
  • ISBN-10: 0-13-469438-4
  • ISBN-13: 978-0-13-469438-2

The Complete Guide to OpenACC for Massively Parallel Programming

Scientists and technical professionals can use OpenACC to leverage the immense power of modern GPUs without the complexity traditionally associated with programming them. OpenACC™ for Programmers is one of the first comprehensive and practical overviews of OpenACC for massively parallel programming.

This book integrates contributions from 19 leading parallel-programming experts from academia, public research organizations, and industry. The authors and editors explain each key concept behind OpenACC, demonstrate how to use essential OpenACC development tools, and thoroughly explore each OpenACC feature set.

Throughout, you’ll find realistic examples, hands-on exercises, and case studies showcasing the efficient use of OpenACC language constructs. You’ll discover how OpenACC’s language constructs can be translated to maximize application performance, and how its standard interface can target multiple platforms via widely used programming languages.

Each chapter builds on what you’ve already learned, helping you build practical mastery one step at a time, whether you’re a GPU programmer, scientist, engineer, or student. All example code and exercise solutions are available for download at GitHub.

  • Discover how OpenACC makes scalable parallel programming easier and more practical
  • Walk through the OpenACC spec and learn how OpenACC directive syntax is structured
  • Get productive with OpenACC code editors, compilers, debuggers, and performance analysis tools
  • Build your first real-world OpenACC programs
  • Exploit loop-level parallelism in OpenACC, understand the levels of parallelism available, and maximize accuracy or performance
  • Learn how OpenACC programs are compiled
  • Master OpenACC programming best practices
  • Overcome common performance, portability, and interoperability challenges
  • Efficiently distribute tasks across multiple processors

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Author's Site

For updated application codes from the authors, please visit their GitHub site.

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Table of Contents

Foreword xv

Preface xxi

Acknowledgments xxiii

About the Contributors xxv

Chapter 1: OpenACC in a Nutshell 1

1.1 OpenACC Syntax 3

1.2 Compute Constructs 6

1.3 The Data Environment 11

1.4 Summary 15

1.5 Exercises 15

Chapter 2: Loop-Level Parallelism 17

2.1 Kernels Versus Parallel Loops 18

2.2 Three Levels of Parallelism 21

2.3 Other Loop Constructs 24

2.4 Summary 30

2.5 Exercises 31

Chapter 3: Programming Tools for OpenACC 33

3.1 Common Characteristics of Architectures 34

3.2 Compiling OpenACC Code 35

3.3 Performance Analysis of OpenACC Applications 36

3.4 Identifying Bugs in OpenACC Programs 51

3.5 Summary 53

3.6 Exercises 54

Chapter 4: Using OpenACC for Your First Program 59

4.1 Case Study 59

4.2 Creating a Naive Parallel Version 68

4.3 Performance of OpenACC Programs 71

4.4 An Optimized Parallel Version 73

4.5 Summary 78

4.6 Exercises 79

Chapter 5: Compiling OpenACC 81

5.1 The Challenges of Parallelism 82

5.2 Restructuring Compilers 88

5.3 Compiling OpenACC 92

5.4 Summary 97

5.5 Exercises 97

Chapter 6: Best Programming Practices 101

6.1 General Guidelines 102

6.2 Maximize On-Device Compute 105

6.3 Optimize Data Locality 108

6.4 A Representative Example 112

6.5 Summary 118

6.6 Exercises 119

Chapter 7: OpenACC and Performance Portability 121

7.1 Challenges 121

7.2 Target Architectures 123

7.3 OpenACC for Performance Portability 124

7.4 Code Refactoring for Performance Portability126

7.5 Summary 132

7.6 Exercises133

Chapter 8: Additional Approaches to Parallel Programming 135

8.1 Programming Models135

8.2 Programming Model Components142

8.3 A Case Study 155

8.4 Summary170

8.5 Exercises170

Chapter 9: OpenACC and Interoperability 173

9.1 Calling Native Device Code from OpenACC 174

9.2 Calling OpenACC from Native Device Code 181

9.3 Advanced Interoperability Topics 182

9.4 Summary185

9.5 Exercises185

Chapter 10: Advanced OpenACC 187

10.1 Asynchronous Operations 187

10.2 Multidevice Programming 204

10.3 Summary 213

10.4 Exercises 213

Chapter 11: Innovative Research Ideas Using OpenACC, Part I 215

11.1 Sunway OpenACC 215

11.2 Compiler Transformation of Nested Loops for Accelerators 224

Chapter 12: Innovative Research Ideas Using OpenACC, Part II 237

12.1 A Framework for Directive-Based High-Performance Reconfigurable Computing 237

12.2 Programming Accelerated Clusters Using XcalableACC 253

Index 269


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