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    <blockquote> <p>Can Haskell provide some of the benefits of Node.js, namely a clean solution to avoid blocking I/O without having recourse to multi-thread programming?</p> </blockquote> <p>Yes, in fact events and threads are unified in Haskell. </p> <ul> <li>You can program in explicit lightweight threads (e.g. millions of threads on a single laptop).</li> <li>Or; you can program in an async event-driven style, based on scalable event notification.</li> </ul> <p>Threads are actually <a href="http://research.google.com/pubs/archive/36841.pdf" rel="noreferrer">implemented in terms of events</a>, and run across multiple cores, with seamless thread migration, with documented performance, and applications.</p> <p>E.g. for</p> <ul> <li>massively <a href="http://www.galois.com/blog/2010/06/14/orc-in-haskell-now-on-hackage/" rel="noreferrer">concurrent job orchestration</a></li> <li>concurrent collections <a href="http://software.intel.com/en-us/blogs/2010/06/24/haskell-cnc-new-paper-available-tests-on-32-and-48-cores/" rel="noreferrer">scaling on 32 or 48 cores</a></li> <li>tool support for profiling and debugging <a href="http://research.microsoft.com/en-us/projects/threadscope/" rel="noreferrer">multi-threaded/multi-event programs</a>.</li> <li>high performance <a href="http://snapframework.com" rel="noreferrer">event-driven web servers</a>.</li> <li>interesting users: <a href="http://www.starling-software.com/misc/icfp-2009-cjs.pdf" rel="noreferrer">such as high-frequency trading</a>.</li> </ul> <p><em>Concurrent collections nbody on 32 cores</em></p> <p><img src="https://i.stack.imgur.com/kUfr9.jpg" alt="alt text"></p> <p>In Haskell you have both events and threads, and as it is all events under the hood.</p> <p><a href="http://research.google.com/pubs/archive/36841.pdf" rel="noreferrer">Read the paper</a> describing the implementation.</p>
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    1. POWhat is the Haskell response to Node.js?
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    1. USDon Stewart
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    1. COThanks. I need to digest all this... This seems to be GHC-specific. I guess it's OK. The Haskell language is sometime as anything GHC can compile. In a similar way, the Haskell "platform" is more or less the GHC run-time.
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      1. USgawi
    2. CO@gawi: That and all of the other packages that get bundled right into it so that it is useful right out of the box. And this is the same image that I saw in my CS course; and the best part is that it is not hard in Haskell to achieve similar awesome results in your own programs.
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      1. USRobert Massaioli
    3. COHi Don, do you think you could link to the haskell web server that performs the best (Warp) when answering questions like these? Here is the quite relevant benchmark against Node.js: http://www.yesodweb.com/blog/2011/03/preliminary-warp-cross-language-benchmarks
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      1. USGreg Weber
 

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