Book Image

Clojure High Performance Programming

By : Shantanu Kumar
Book Image

Clojure High Performance Programming

By: Shantanu Kumar

Overview of this book

<p>Clojure is a young, dynamic, functional programming language that runs on the Java Virtual Machine. It is built with performance, pragmatism, and simplicity in mind. Like most general purpose languages, Clojure’s features have different performance characteristics that one should know in order to write high performance code.<br /><br />Clojure High Performance Programming is a practical, to-the-point guide that shows you how to evaluate the performance implications of different Clojure abstractions, learn about their underpinnings, and apply the right approach for optimum performance in real-world programs.<br /><br />This book discusses the Clojure language in the light of performance factors that you can exploit in your own code.</p> <p>You will also learn about hardware and JVM internals that also impact Clojure’s performance. Key features include performance vocabulary, performance analysis, optimization techniques, and how to apply these to your programs. You will also find detailed information on Clojure's concurrency, state-management, and parallelization primitives.</p> <p>This book is your key to writing high performance Clojure code using the right abstraction, in the right place, using the right technique.</p>
Table of Contents (15 chapters)
Clojure High Performance Programming
Credits
About the Author
Acknowledgments
About the Reviewers
www.PacktPub.com
Preface
Index

Chapter 7. Application Performance

As opposed to performance analysis and optimization at a smaller component level, it takes a holistic approach for the same at the application level. Higher level concerns, such as serving a certain threshold of users in a day or handling an identified quantum of load through a multilayered system, require us to think about how the components fit together and how the load is designed to flow through the application. In this chapter, we will discuss such high level concerns. Like the previous chapter, by and large this chapter applies to applications written in any JVM language, but it is written with a special focus on Clojure. In this chapter, we will discuss the following topics:

  • General performance techniques that apply to all layers of the code

  • Data sizing

  • Resource pooling

  • Fetching and computing in advance

  • Staging and batching

  • Little's law