http://ayende.comAyende @ RahienCopyright (C) Ayende Rahien 2004 - 2021 (c) 202660@Oliver Your first correction is wrong, the other two are right http://ayende.com/4439/challenge-what-does-this-code-do#comment17http://ayende.com/4439/challenge-what-does-this-code-do#comment17Sat, 20 Mar 2010 16:02:33 GMTUsing lists:nth in this way is a bad idea. Quadratic behaviour ahoy! Possible fixes: 1) switch to using arrays or one of the dictionary libraries 2) change your state to keep two lists: the processes you haven't used this round yet, and the ones you have. When the first list runs out, reverse the second and use it again. Additionally, it's now trivial to add more processes, if desired. http://ayende.com/4439/challenge-what-does-this-code-do#comment16http://ayende.com/4439/challenge-what-does-this-code-do#comment16Sat, 20 Mar 2010 06:03:14 GMTIt was a sample code that I had written in that course. http://ayende.com/4439/challenge-what-does-this-code-do#comment15http://ayende.com/4439/challenge-what-does-this-code-do#comment15Fri, 19 Mar 2010 18:21:32 GMT@Ayende: Is it something that you've built or did you find the code in some other app? If you built it, for what project do you use it? I am thinking about Erlang course that we've participated one week ago :-) http://ayende.com/4439/challenge-what-does-this-code-do#comment14http://ayende.com/4439/challenge-what-does-this-code-do#comment14Fri, 19 Mar 2010 15:59:38 GMTYes, lightweight erlang threads, not OS threads. http://ayende.com/4439/challenge-what-does-this-code-do#comment13http://ayende.com/4439/challenge-what-does-this-code-do#comment13Fri, 19 Mar 2010 14:25:43 GMTCadet354, I'll quibble with threads vs. processes, but you are correct. http://ayende.com/4439/challenge-what-does-this-code-do#comment12http://ayende.com/4439/challenge-what-does-this-code-do#comment12Fri, 19 Mar 2010 14:23:22 GMTinit runs Num threads. handle_call (Msg, From, State) handled asynchronously (gen_server: cast) request. (Processes, (CurrentIndex +1) rem Num, Num) selects the next thread that will work. P.S. I apologize for my bad English http://ayende.com/4439/challenge-what-does-this-code-do#comment11http://ayende.com/4439/challenge-what-does-this-code-do#comment11Fri, 19 Mar 2010 14:20:06 GMTCadet354, Great! You got it! Now, how does it work? :-) http://ayende.com/4439/challenge-what-does-this-code-do#comment10http://ayende.com/4439/challenge-what-does-this-code-do#comment10Fri, 19 Mar 2010 13:52:59 GMTload balancer in erlang code. http://ayende.com/4439/challenge-what-does-this-code-do#comment9http://ayende.com/4439/challenge-what-does-this-code-do#comment9Fri, 19 Mar 2010 13:35:14 GMTNice to see Myspace implementation: [http://code.google.com/p/qizmt/](http://code.google.com/p/qizmt/)http://ayende.com/4439/challenge-what-does-this-code-do#comment8http://ayende.com/4439/challenge-what-does-this-code-do#comment8Fri, 19 Mar 2010 13:12:06 GMTWow, so that's THE map/reduce... I'm totally disappointed, after having heard so much about it i expected it to have at least 200 lines of code. http://ayende.com/4439/challenge-what-does-this-code-do#comment7http://ayende.com/4439/challenge-what-does-this-code-do#comment7Fri, 19 Mar 2010 12:22:15 GMTIt is a map/reduce algorithm written using the gen_server behavior from the OTP erlang library. http://ayende.com/4439/challenge-what-does-this-code-do#comment6http://ayende.com/4439/challenge-what-does-this-code-do#comment6Fri, 19 Mar 2010 12:15:57 GMTits lambda expressions in F# I think but am not sure http://ayende.com/4439/challenge-what-does-this-code-do#comment5http://ayende.com/4439/challenge-what-does-this-code-do#comment5Fri, 19 Mar 2010 12:09:06 GMTDon't know Erlang either, but I think I spot some syntax errors/typos: {stop, normal, State ); --> {stop, normal, State }. an in handle_call() I guess there's a } missing at the end before the dot, as well as a (maybe optional?) comma in terminate() after ... = State. I might be wrong though. http://ayende.com/4439/challenge-what-does-this-code-do#comment4http://ayende.com/4439/challenge-what-does-this-code-do#comment4Fri, 19 Mar 2010 11:09:09 GMTThis is Erlang code. I'm not fluent in Erlang, but I think it starts some Erlang processes and delegates handling of messages to one of those services. Every time this process receives a message it delegates the message to the next "child process". http://ayende.com/4439/challenge-what-does-this-code-do#comment3http://ayende.com/4439/challenge-what-does-this-code-do#comment3Fri, 19 Mar 2010 10:29:29 GMTGoogle tells me that it's Erlang.I can't understand it for the life of me, but It looks like a small server process, maybe doing unnatural acts on processes. http://ayende.com/4439/challenge-what-does-this-code-do#comment2http://ayende.com/4439/challenge-what-does-this-code-do#comment2Fri, 19 Mar 2010 10:19:47 GMTIt looks like a functional language, maybe f# or Clojure returning a list messages http://ayende.com/4439/challenge-what-does-this-code-do#comment1http://ayende.com/4439/challenge-what-does-this-code-do#comment1Fri, 19 Mar 2010 10:18:44 GMT