Plugging Space Leaks, Improving Performance
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Confused by foldl' vs foldl? Unsure when you've got the strictness right? Programs taking too much memory and running too slow? You are not alone! Most Haskell programs suffer from "space leaks" - this talk covers examples (all only found and fixed in the last year) from the base library, QuickCheck, pretty, Happy, Alex and Shake. Some fixes saved over 1Gb of memory! Space leaks occur when a program uses more memory than necessary. Haskell, as a lazy language, is particularly vulnerable to a form of space leak where a small accumulator (e.g. an Int) is instead represented by a sequence of updates that grows on each iteration. In this talk, you will learn the gritty details of space leaks, then the session sets off on a quest to remove them from all Haskell programs. You will explore the relationship between space leaks and stack usage, then how to use the existing tools built in to GHC to detect and debug excessive stack usage. These techniques have already slain lots of space leaks, and hopefully in your hands they can destroy even more.
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Thanks to our sponsors
Plugging Space Leaks, Improving Performance
Neil Mitchell
Neil Mitchell is a Haskell programmer who lives in Cambridge with his wife Emily and his son Henry. Neil has a PhD in Computer Science from York University, working on making functional programs shorter, faster and safer. Since then he's worked with F# at Credit Suisse and Haskell/F#/C++ at Standard Chartered and Barclays, taking the lessons of functional programming and applying them in finance.
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SkillsCast
Please log in to watch this conference skillscast.
Confused by foldl' vs foldl? Unsure when you've got the strictness right? Programs taking too much memory and running too slow? You are not alone! Most Haskell programs suffer from "space leaks" - this talk covers examples (all only found and fixed in the last year) from the base library, QuickCheck, pretty, Happy, Alex and Shake. Some fixes saved over 1Gb of memory! Space leaks occur when a program uses more memory than necessary. Haskell, as a lazy language, is particularly vulnerable to a form of space leak where a small accumulator (e.g. an Int) is instead represented by a sequence of updates that grows on each iteration. In this talk, you will learn the gritty details of space leaks, then the session sets off on a quest to remove them from all Haskell programs. You will explore the relationship between space leaks and stack usage, then how to use the existing tools built in to GHC to detect and debug excessive stack usage. These techniques have already slain lots of space leaks, and hopefully in your hands they can destroy even more.
YOU MAY ALSO LIKE:
- Fast XML Parsing with Haskell (SkillsCast recorded in October 2017)
- Functional Concurrency in .NET with C# and F# (in London on 9th - 10th September 2019)
- Fast Track to F# with Tomas Petricek & Phil Trelford (in London on 9th - 10th September 2019)
- Haskell eXchange 2019 (in London on 10th - 11th October 2019)
- Clojure eXchange 2019 (in London on 2nd - 3rd December 2019)
- Hands-on: Fractal art with Fable and WebGL (in London on 20th June 2019)
- London Clojure July: Exploring REPL tooling with socket prepl (in London on 2nd July 2019)
- Scala 2.13 and Beyond! (SkillsCast recorded in April 2019)
- Introduction to Markov Chains in F# (SkillsCast recorded in April 2019)
Thanks to our sponsors
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About the Speaker
Plugging Space Leaks, Improving Performance
Neil Mitchell
Neil Mitchell is a Haskell programmer who lives in Cambridge with his wife Emily and his son Henry. Neil has a PhD in Computer Science from York University, working on making functional programs shorter, faster and safer. Since then he's worked with F# at Credit Suisse and Haskell/F#/C++ at Standard Chartered and Barclays, taking the lessons of functional programming and applying them in finance.