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    <p>It depends what you want to do with your server. As might be expected from a telecoms application, <strong>Erlang excels at doing simple tasks with very high concurrency</strong>. If your server will need a bazillion connections per second, or at once, Erlang is your friend. Erlang also offers better support for distributing load over multiple servers.</p> <p><strong>Haskell excels at complex, symbolic computation</strong> and as of April 2009 can also handle a great many threads (see update below). Moreover, Haskell has <strong>more tools for getting complicated code right</strong>: things like <a href="http://www.cs.chalmers.se/~rjmh/QuickCheck/" rel="nofollow noreferrer">QuickCheck</a>, <a href="http://www.cs.york.ac.uk/fp/smallcheck/" rel="nofollow noreferrer">SmallCheck</a>, and the static type system. So if your server is doing complicated, interesting things and you can get by with just one server, you're probably better off with Haskell.</p> <hr> <p><strong>Update 13 April 2009</strong>: Don Stewart, a reliable source, reports that "the last thread-scaling bug in the Glasgow Haskell Compiler was squished a few months ago", and that some users report using a million Haskell threads without trouble. As of January 2009, there is a <a href="http://research.microsoft.com/en-us/um/people/simonpj/papers/parallel/" rel="nofollow noreferrer">new, unpublished paper from the implementors</a> which may describe how this is achieved.</p> <hr> <p><strong>Update 21 February 2012</strong>: John Hughes's company, <a href="http://quviq.com" rel="nofollow noreferrer">QuviQ</a>, now makes QuickCheck for Erlang. They have found a number of very interesting bugs. You can download "QuickCheck Mini" for free; it is comparable to the Haskell QuickCheck. There is also a more powerful commercial version.</p>
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    1. COcan you give some evidence for your claim about Haskell hitting a wall wrt threads sooner? With OS threads, perhaps... but what about Haskell threads?
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    2. COmy Erlang bubble burst a bit when I saw this: http://www.nabble.com/Chameneos.rednux-micro-benchmark-td19925134.html ... I verified the results on my boxes and they are correct, there seems to be some huge issue with SMP scalability and messaging. The GHC implementation performs much better...
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    3. CO@ja: All my evidence comes from hallway conversations with the Erlang and GHC guys at ICFP (http://icfpconference.org). It is true that the GHC guys have spent the last year really gearing up for multicore and parallelism, whereas my impression is Erlang is now more in a commercialization phase.
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