Garbage collection and memory management in Erlang
To classify things, lets define the memory layout and then talk about how GC works. Memory Layout In Erlang, each thread of execution is called a process. Each process has its own memory and that memory layout consists of three parts: Process Control Block, Stack and Heap. PCB: Process Control Block holds information like process identifier (PID), current status (running, waiting), its registered
Erlang array vs list
I'm new to Erlang so I am working on an example program and struggling to decide whether I should use an array or a list. Both are easy to create and handle but I didn't get: How you append an item to an array without knowing an index of where it should be appended. Is array:set(array:size(A),"a",A) the way to go? How to find out if a certain element is a member of the array, just as the lists:mem
Looking for persistent, distributed, worker queue for erlang
We use RABBITMQ to bind up all our applications into a complete set of things. Within the whole setup is a central RABBITMQ server to which systems create queues , whether persistent or temporary. Because of RABBITMQ availability, our entire distribution system runs on top of it. Systems built using different technologies send and receive tasks from other systems via RABBITMQ. We came up with a Me
How to identify the exact memory size of an ETS table?
TL;DR: ETS table allocated memory size in bytes: ets:info(Table,memory) * erlang:system_info(wordsize). To elaborate a bit, ets:info(Table,memory) gives you the words allocated to data in an ETS table (same for Mnesia. You can view al that info in the TV application. The same attribute for DETS tables is in bytes). A word is nothing more than the 'natural' data unit of a particular CPU architectur
Can I change the priority of a process in Erlang?
I understand from here http://cs.ucsb.edu/~puneet/reports/erlang.pdf (section 4.4) that Process Scheduling in Erlang is based on 4 different queues - with one designated as 'highest priority'. I have an Erlang program and I'd like to assign one process so that its instructions join this queue. Is there a way to do this? Are there any watch-its when doing this?
Erlang : Returning from a function
I have a function in which I have a series of individual case statements. case ... of ... end, case ... of ... end, ... etc. I want to return from the function immediately when a particular case condition occurs in one of the case statements - so that the next case statement is not checked, and the function just exits/returns. How do I do that?
Printing a given tuple out of an array erlang
I am having some minor trouble with erlang, namely that I want to print out a given part of an array, however, I do not appear to be able to do so easily. Here is the array I am trying to print using array:get(X, Array). [{carrier, [{e,10}, {f,10}, {g,10}, {h,10}, {i,10}]}, {battleship, [{a,1}, {a,2}, {a,3}, {a,4}]}, {cruiser, [{e,3}, {e,4}, {e,5}]}, {destroyer, [{f,4},{g,4}, {h,4}]}, {patrol_boat
Best way to integrate Erlang and python
What's the best way to integrate Erlang and python? We need to call python functions in Erlang and call Erlang functions in python. At this moment we are trying to use SOAP as a intermediate layer between these two languages, but we have a lot of "not compatible" troubles. Could you advise the best way to perform integration?
What kind of types can be sent on an Erlang message?
Here's an interesting article about "passing fun's to other Erlang nodes". To resume it briefly: [...] As you might know, Erlang distribution works by sending the binary encoding of terms; and so sending a fun is also essentially done by encoding it using erlang:term_to_binary/1; passing the resulting binary to another node, and then decoding it again using erlang:binary_to_term/1.[...] This is pr
How does -on_load work in erlang?
I seem to not fully understand, how the -on_load directive works. In a module i have written i have a function to initialize an ets table and populate it with some data. This function works properly when calling it explicitly. However: i thought it would be nice, if the ets table would be populated "automatically" when the module is loaded. But this does not seem to work, because ets:info(filesig)
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