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Hands-On Concurrency with Rust
Hands-On Concurrency with Rust

Hands-On Concurrency with Rust: Confidently build memory-safe, parallel, and efficient software in Rust

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Hands-On Concurrency with Rust

Sequential Rust Performance and Testing

"Make it work, then make it beautiful, then if you really, really have to, make it fast."
                                                                                                         - Joe Armstrong

In the previous chapter, we discussed the basics of modern computer architectures—the CPU and its function, memory hierarchies, and their interplay. We left off with a brief introduction to debugging and performance analysis of Rust programs. In this chapter, we'll continue that discussion, digging into the performance characteristics of sequential...

Technical requirements

This chapter requires a working Rust installation. The details of verifying your installation are covered in Chapter 1, Preliminaries – Machine Architecture and Getting Started with Rust. The Valgrind suite of tools will be used here. Many operating systems bundle valgrind packages but you can find further installation instructions for your system at valgrind.org. Linux Perf is used and is bundled by many Linux distributions. Any other software required for this chapter is installed as a part of the text.

You can find the source code for this book's projects on GitHub: https://github.com/PacktPublishing/Hands-On-Concurrency-with-Rust. The source code for this chapter is under Chapter02.

Diminishing returns

The hard truth is that there's a diminishing return when applying more and more concurrent computational resources to a problem. Performing parallel computations implies some coordination overhead—spawning new threads, chunking data, and memory bus issues in the presence of barriers or fences, depending on your CPU. Parallel computing is not free. Consider this Hello, world! program:

fn main() {
    println!("GREETINGS, HUMANS");
}

Straightforward enough, yeah? Compile and run it 100 times:

hello_worlds > rustc -C opt-level=3 sequential_hello_world.rs
hello_worlds > time for i in {1..100}; do ./sequential_hello_world > /dev/null; done

real    0m0.091s
user    0m0.004s
sys     0m0.012s

Now, consider basically the same program but involving the overhead of spawning a thread:

use std::thread;

fn main() {
  ...

Performance

In this section, we'll focus on the serial performance of a common data structure—associative arrays. We'll apply the tools we learned about in the previous chapter to probe different implementations. We'll focus on the associative array because it is fairly well-trod territory, studied in introductory computer science courses, and is available in most higher-level languages by default, Rust being no exception save the higher-level bit. We'll look at Rust's associative array first, which is called std::collections::HashMap.

Standard library HashMap

Let's poke around in HashMap's internals. A good starting place, I find, for inspecting unfamiliar Rust data structures is...

Summary

What should we understand from all of this? To produce software that operates at the edge of the machine's ability, you must understand some important things. Firstly, if you aren't measuring your program, you're only guessing. Measuring runtime, as criterion does, is important but a coarse insight. Where is my program spending its time? is a question the Valgrind suite and perf can answer, but you've got to have benchmarks in place to contextualize your questions. Measuring and then validating behavior is also an important chunk of this work, which is why we spent so much time on QuickCheck and AFL. Secondly, have a goal in mind. In this chapter, we've made the speed of standard library HashMap our goal but, in an actual code base, there's always going to be places to polish and improve. What matters is knowing what needs to happen to...

Further reading

In this chapter, we covered measuring and improving the performance of a serial Rust program while demonstrating the program's fitness for purpose. This is a huge area of work and there's a deep well of literature to pull from.

  • Robin Hood Hashing, 1985, Pedro Celis. This thesis introduced the Robin Hood hashing strategy for constructing associative arrays and is the foundation for the implementation you'll find in Rust. The paper also goes into further...
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Key benefits

  • Learn and improve the sequential performance characteristics of your software
  • Understand the use of operating system processes in a high-scale concurrent system
  • Learn of the various coordination methods available in the Standard library

Description

Most programming languages can really complicate things, especially with regard to unsafe memory access. The burden on you, the programmer, lies across two domains: understanding the modern machine and your language's pain-points. This book will teach you to how to manage program performance on modern machines and build fast, memory-safe, and concurrent software in Rust. It starts with the fundamentals of Rust and discusses machine architecture concepts. You will be taken through ways to measure and improve the performance of Rust code systematically and how to write collections with confidence. You will learn about the Sync and Send traits applied to threads, and coordinate thread execution with locks, atomic primitives, data-parallelism, and more. The book will show you how to efficiently embed Rust in C++ code and explore the functionalities of various crates for multithreaded applications. It explores implementations in depth. You will know how a mutex works and build several yourself. You will master radically different approaches that exist in the ecosystem for structuring and managing high-scale systems. By the end of the book, you will feel comfortable with designing safe, consistent, parallel, and high-performance applications in Rust.

Who is this book for?

This book is aimed at software engineers with a basic understanding of Rust who want to exploit the parallel and concurrent nature of modern computing environments, safely.

What you will learn

  • • Probe your programs for performance and accuracy issues
  • • Create your own threading and multi-processing environment in Rust
  • • Use coarse locks from Rust's Standard library
  • • Solve common synchronization problems or avoid synchronization using atomic programming
  • • Build lock-free/wait-free structures in Rust and understand their implementations in the crates ecosystem
  • • Leverage Rust's memory model and type system to build safety properties into your parallel programs
  • • Understand the new features of the Rust programming language to ease the writing of parallel programs
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Publication date : May 31, 2018
Length: 462 pages
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Language : English
ISBN-13 : 9781788399975
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Table of Contents

11 Chapters
Preliminaries – Machine Architecture and Getting Started with Rust Chevron down icon Chevron up icon
Sequential Rust Performance and Testing Chevron down icon Chevron up icon
The Rust Memory Model – Ownership, References and Manipulation Chevron down icon Chevron up icon
Sync and Send – the Foundation of Rust Concurrency Chevron down icon Chevron up icon
Locks – Mutex, Condvar, Barriers and RWLock Chevron down icon Chevron up icon
Atomics – the Primitives of Synchronization Chevron down icon Chevron up icon
Atomics – Safely Reclaiming Memory Chevron down icon Chevron up icon
High-Level Parallelism – Threadpools, Parallel Iterators and Processes Chevron down icon Chevron up icon
FFI and Embedding – Combining Rust and Other Languages Chevron down icon Chevron up icon
Futurism – Near-Term Rust Chevron down icon Chevron up icon
Other Books You May Enjoy Chevron down icon Chevron up icon

Customer reviews

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Rating distribution
Full star icon Full star icon Full star icon Full star icon Half star icon 4.7
(7 Ratings)
5 star 85.7%
4 star 0%
3 star 14.3%
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1 star 0%
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SZ Jan 08, 2022
Full star icon Full star icon Full star icon Full star icon Full star icon 5
This book is absolutely excellent. Highly recommended.
Amazon Verified review Amazon
Babopp Jul 27, 2018
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Well, of course I love it!!! Our son wrote it! So I'm a bit biased!
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Patrick Jul 05, 2018
Full star icon Full star icon Full star icon Full star icon Full star icon 5
I'm still working through this, but I feel like this deserves a review. This book convinced me that there's still books on programming being written that are worth reading. Even the intro chapter has taught me things that I either forgot or wasn't taught in my university classes that they definitely should have taught me.Do yourself a favor and read the sample, you'll learn things even in that short read.
Amazon Verified review Amazon
Anil Thaplar May 26, 2019
Full star icon Full star icon Full star icon Full star icon Full star icon 5
I am still evaluating rust on the side projects. This is great book along with "The rust programming language" book giving more deeper insights..
Amazon Verified review Amazon
Sylvain Kerkour May 23, 2019
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Reading the book, we can feel that the author knows what he is talking about.Great programming book!
Amazon Verified review Amazon
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