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Haskell High Performance Programming

Haskell High Performance Programming

By : Thomasson
3 (2)
close
Haskell High Performance Programming

Haskell High Performance Programming

3 (2)
By: Thomasson

Overview of this book

Haskell, with its power to optimize the code and its high performance, is a natural candidate for high performance programming. It is especially well suited to stacking abstractions high with a relatively low performance cost. This book addresses the challenges of writing efficient code with lazy evaluation and techniques often used to optimize the performance of Haskell programs. We open with an in-depth look at the evaluation of Haskell expressions and discuss optimization and benchmarking. You will learn to use parallelism and we'll explore the concept of streaming. We’ll demonstrate the benefits of running multithreaded and concurrent applications. Next we’ll guide you through various profiling tools that will help you identify performance issues in your program. We’ll end our journey by looking at GPGPU, Cloud and Functional Reactive Programming in Haskell. At the very end there is a catalogue of robust library recommendations with code samples. By the end of the book, you will be able to boost the performance of any app and prepare it to stand up to real-world punishment.
Table of Contents (16 chapters)
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15
Index

Reading, writing, and handling resources

Although it's a common joke that because Haskell is a pure language, we couldn't observe its effects, Haskell actually has very powerful and sophisticated facilities for interacting with the outside world. Besides reading and writing to files and network sockets, I/O affiliates to managing resources that provide for input and output.

In this section, we will first point out laziness in Haskell I/O, doing networking with low-level sockets, and consider managing handles and resources.

Traps of lazy I/O

Lazy I/O allows pure functions to be interleaved with I/O actions arbitrarily. It is important to know when an I/O action defers its action part for later. To demonstrate how easy it is to fall prey to lazy I/O, consider this innocent-looking file manipulation procedure:

-- file: readwrite.hs

main = do
    writeFile "file.txt" "old"
    old <- readFile "file.txt"
    writeFile "file.txt" "new&quot...

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