title: Haskell, Scala, Clojure, what to choose for high performance pattern matching and concurrency
body: <p>I have started work on FP recently after reading a lot of blogs and posts about advantages of FP for concurrent execution and performance. My need for FP has been largely influenced by the application that I am developing, My application is a state based data injector into another subsystem where timing is very crucial (close to a 2 million transactions per sec). I have a couple of such subsystems which needs to be tested. 
  I am seriously considering using FP for its parallelism and want to take the correct approach, many posts on SO talk about disadvantages and advantages of Scala, Haskell and Clojure wrt language constructs, libraries and JVM support. From a language point of view I am ok to learn any language as long as it will help me achieve the result.</p>
  
  <p>Certain posts favor Haskell for pattern matching and simplicity of language, JVM based FP lang have a big advantage with respect to using existing java libraries. JaneStreet is a big OCAML supporter but I am really not sure about developer support and help forums for OCAML.</p>
  
  <p>If anybody has worked with handling such large data, please share your experience.</p>