Finally I found the solution. These posts helped to figure this out. RabbitMQ on EC2 Consuming Tons of CPU and https://serverfault.com/questions/337982/how-do-i-restart-rabbitmq-after-switching-machines What happened was rabbitmq was holding on to all the results that were never freed to the point it became overloaded. I cleared all the stale data in /var/lib/rabbitmq/mnesia/rabbit/, restarted rabbit and it works … Read more
I’m a month-or-so into learning and the guides I’m enjoying most are: The Erlang Site’s Getting Started with Erlang Guide Joe Armstrong’s Book Software for a Concurrent World (thoroughly recommended) And I have on order: O’Reilly’s Erlang Programming which has had some really positive reviews and sounds like a good companion to Joe Armstrong’s book … Read more
Printed process ids < A.B.C > are composed of 6: A, the node number (0 is the local node, an arbitrary number for a remote node) B, the first 15 bits of the process number (an index into the process table) 7 C, bits 16-18 of the process number (the same process number as B) … Read more
Disclaimer: I am the PO for Akka Erlang does copy-on-send – Akka uses shared memory (immutable objects) for in-VM sends Erlang does per-process GC – Akka uses JVM GCs Erlang has OTP – Akka integrates with the entire Java ecosystem (Apache Camel, JAX-RS, etc etc) Erlang does the process scheduling for you – Akka allows … Read more
The reliability figure wasn’t supposed to measure the total time any part of AXD301 (project in question) was ever shut down for over 20 years. It represents the total time over those 20 years that the service provided by the AXD301 system was ever offline. Subtle difference. As Joe Armstrong says here: The AXD301 has … Read more
Erlang itself is written in Erlang. Sounds strange? Yes, because it is only partially true. OK look at it in more detail: Erlang preprocessor is written in Erlang. Erlang parser is written in Erlang. Erlang compiler to BEAM (byte-code VM) is written in Erlang. Erlang compiler to HiPE (native VM extension) is written in Erlang. … Read more
You shouldn’t stumble on anything you can do in one that you can’t in the other, since you can freely call Elixir code from Erlang and vice-versa. You can even easily mix Erlang and Elixir files in one project. In Elixir: :erlang_module.erlang_function(args) in Erlang: ‘Elixir.ElixirModule’:elixir_function(args)
The Erlang VM runs as one OS process. By default it runs one OS thread per core to achieve maximum utilisation of the machine. The number of threads and on which cores they run can be set when the VM is started. Erlang processes are implemented entirely by the Erlang VM and have no connection … Read more
From Programming Erlang: alt text http://bks8.books.google.com/books?id=Qr_WuvfTSpEC&printsec=frontcover&img=1&zoom=5&sig=ACfU3U2F4YY4KqO0vCuZ4WEZjdE2yFFvvg Many companies are using Erlang in their production systems: • Amazon uses Erlang to implement SimpleDB, providing database services as a part of the Amazon Elastic Compute Cloud (EC2). • Yahoo! uses it in its social bookmarking service, Delicious, which has more than 5 million users and 150 million … Read more
Just to clarify the naming, they are both functions. One is a named function and the other is an anonymous one. But you are right, they work somewhat differently and I am going to illustrate why they work like that. Let’s start with the second, fn. fn is a closure, similar to a lambda in … Read more