Book Image

C++ High Performance - Second Edition

By : Björn Andrist, Viktor Sehr
5 (2)
Book Image

C++ High Performance - Second Edition

5 (2)
By: Björn Andrist, Viktor Sehr

Overview of this book

C++ High Performance, Second Edition guides you through optimizing the performance of your C++ apps. This allows them to run faster and consume fewer resources on the device they're running on without compromising the readability of your codebase. The book begins by introducing the C++ language and some of its modern concepts in brief. Once you are familiar with the fundamentals, you will be ready to measure, identify, and eradicate bottlenecks in your C++ codebase. By following this process, you will gradually improve your style of writing code. The book then explores data structure optimization, memory management, and how it can be used efficiently concerning CPU caches. After laying the foundation, the book trains you to leverage algorithms, ranges, and containers from the standard library to achieve faster execution, write readable code, and use customized iterators. It provides hands-on examples of C++ metaprogramming, coroutines, reflection to reduce boilerplate code, proxy objects to perform optimizations under the hood, concurrent programming, and lock-free data structures. The book concludes with an overview of parallel algorithms. By the end of this book, you will have the ability to use every tool as needed to boost the efficiency of your C++ projects.
Table of Contents (17 chapters)
15
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16
Index

Performance

Each time a coroutine is created (when it is first called) a coroutine frame is allocated to hold the coroutine state. The frame can be allocated on the heap, or on the stack in some circumstances. However, there are no guarantees to completely avoid the heap allocation. If you are in a situation where heap allocations are forbidden (for example, in a real-time context) the coroutine can be created and immediately suspended in a different thread, and then passed to the part of the program that needs to actually use the coroutine. Suspend and resume are guaranteed to not allocate any memory and have a cost comparable with an ordinary function call.

At the time of writing this book, compilers have experimental support for coroutines. Small experiments have shown promising results related to performance, showing that coroutines are friendly to the optimizer. However, I will not provide you with any benchmarks of coroutines in this book. Instead, I have shown you how stackless...