We should specify that we talk about horizontal scalability of physical machines — that’s the only problem. CPUs on one machine will be handled by one VM, no matter what the number of those is. node = machine. To begin, I can say that 30-60 nodes you get out of the box (vanilla OTP installation) … Read more
From http://www.erlang.org/doc/man/lists.html it looks like lists:seq(1, 100) does what you want. You can also do things like lists:seq(1, 100, 2) to get all of the odd numbers in that range instead.
Short answer: no way to know for sure without also knowing the contents of your source file 🙂 There are a few ways to run Elixir code. This answer will be an overview of various workflows that can be used with Elixir. When you are just getting started and want to try things out, launching … Read more
As of Erlang 20.0, the full set of version string tags is: [64-bit] The BEAM emulator is built to make full use of a 64-bit CPU. [async-threads:10] This refers to the number of threads in the Erlang emulator’s async thread pool, which more or less tells you how many blocked system calls can be spun … Read more
To delve into the past: Originally in guards there were only , separated tests which were evaluated from left-to-right until either there were no more and the guard succeeded or a test failed and the guard as a whole failed. Later ; was added to allow alternate guards in the same clause. If guards evaluate … Read more
Set the home drive to some dir in the dos shell before executing the cli. Create a startup file, e.g start-rabbit.bat, with contents below. set HOMEDRIVE=C:/conf/rabbitmq :: Or your favorite dir rabbitmq-plugins.bat enable rabbitmq_management Use a folder in C drive c:/conf/rabbitmq. The rabbitmq system will write the cookie file there. It is a good idea … Read more
Use timer:send_interval/2. E.g.: -behavior(gen_server). interval_milliseconds()-> 15000. init()-> timer:send_interval(interval_milliseconds(), interval), {ok, FascinatingStateData}. %% this clause will be called every 15 seconds handle_info(interval, StateData)-> State2 = do_some_work(StateData) {noreply, State2}.
Joe Armstrong has gone on record saying that he thinks that Erlang is “possibly the only object-oriented language” (the context adds “OO in the Alan Kay meaning of the word”). Johnson, in the same interview, points out the same things that Sean Copenhaver says in his answer: in the small, Erlang’s a purely functional language; … Read more
I agree with all previous answers, but I think a key point that is not made totally clear is that one reason that MPI might be considered hard and Erlang easy is the match of model to the domain. Erlang is based on a concept of local memory, asynchronous message passing, and shared state solved … Read more
Quite large if your question is “what’s the storage capacity of an mnesia database made up of a huge number of disc_only_copies tables” – you’re largely limited by available disk space. An easier question to answer is what’s the maximum capacity of a single mnesia table of different types. ram_copies tables are limited by available … Read more