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Haxl is a small framework for automatically batching and overlapping data-fetching. It was open-sourced by Facebook in 2014, and is in large-scale production use as part of Facebook's spam-filtering infrastructure. In this talk I'd like to explore some of the ways we can use Haxl to express not just data-fetching concurrency, but other kinds of concurrency too. I'll also take a look at the internals of Haxl, and explore whether we can generalize the simple model of round-based scheduling to allow more flexible scheduling strategies.
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Simon Marlow is a Software Engineer at Facebook in London. He is working on Haxl, a Haskell-based domain-specific language that is used by the teams fighting spam and malware. Simon is a co-author of the Glasgow Haskell Compiler, author of the book “Parallel and Concurrent Programming in Haskell”, and has a string of research publications in functional programming, language design, compilers, and language implementation.