title: Why OCaml's threading is considered as `not enough`?
body: <p>It seems many people are saying OCaml does not have a good capacity for concurrency and it is also not good for web server applications.</p>
  
  <p>I am currently learning  <a href="http://caml.inria.fr/pub/docs/oreilly-book/html/index.html">ocaml's manual</a>. It seems that OCaml provide concurrency now.</p>
  
  <p>Can I know why OCaml's concurrency/threading is considered as bad? </p>
  
  <p>Can I develop server application in OCaml? What problems may I meet?</p>