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  • Haskell vs Erlang for web services

    - by Zachary K
    I am looking to start an experimental project using a functional language and am trying to decide beween Erlang and Haskell, and both have some points that I really like. I like Haskell's strong type system and purity. I have a feeling it will make it easier to write really reliable code. And I think that the power of haskell will make some of what I want to do much easier. On the minus side I get the feeling that some of the Frameworks for doing web stuff on Haskell such as Yesod are not as advanced as their Erlang counter parts. I rather like the Erlang approach to threads and to fault tollerence. I have a feeling that the scalability of Erlang could be a major plus. Which leeds to to my question, what has people's exerience been in implementing web application backends in both Haskell and Erlang. Are there packages for Haskell to provide some of the lightweight threads and actors that one has in Erlang?

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  • Starting an Erlang slave node in escript fails when using custom Erlang in Ubuntu 10.4

    - by Adam Lindberg
    I have the following escript: #!/usr/bin/env escript %%! -name [email protected] main(_) -> NodeName = test, Host = '127.0.0.1', Args = "", {ok, _Node} = slave:start_link(Host, NodeName, Args), io:format("Node started successfully!"). When running it on Ubuntu 10.04 I get this: $ ./start_slave Node started successfully! $ I want to install my own Erlang (latest version, debug compiled files for dialyzer etc) since the stock install of Erlang on Ubuntu lacks some features. I put my Erlang binaries inside ~/Applications/bin. Starting Erlang normally works, and starting slave nodes inside an Erlang shell works as well. However, now my escript doesn't work. After about 60 seconds it returns an error: $ ./start_slave escript: exception error: no match of right hand side value {error,timeout} Even if I change the first line to the escript to use my erlang version, it still does not work: #!/home/user/Applications/bin/escript The slave node is started with a call to erlang:open_port/2 which seems to be using sh which in turn does not read my .bashrc file that sets my custom PATH environment variable. The timeout seems to occur when slave:start_link/3 waits for the slave node to respond, which it never does. How can I roll my own installation of Erlang and start slave nodes inside escripts on Ubuntu 10.4?

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  • Learning Erlang vs learning node.js

    - by Noli
    I see a lot of crap online about how Erlang kicks node.js' ass in just about every conceivable category. So I'd like to learn Erlang, and give it a shot, but here's the problem. I'm finding that I have a much harder time picking up Erlang than I did picking up node.js. With node.js, I could pick a relatively complex project, and in a day I had something working. With Erlang, I'm running into barriers, and not going nearly as quickly. So.. for those with more experience, is Erlang complicated to learn, or am I just missing something? Node.js might not be perfect, but I seem to be able to get things done with it.

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  • How to setup Erlang + Emacs with erlang.el?

    - by Jonas
    I have downloaded and installed Erlang and EmacsW32. But how do I use erlang.el in Emacs? Where do I place it or install it? I have read Erlang/OTP R13B04 documentation and Erlang mode for Emacs documentation but I haven't found any information about how to set up it.

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  • F# performance vs Erlang performance, is there proof the Erlang's VM is faster?

    - by afuzzyllama
    I've been putting time into learning functional programming and I've come to the part where I want to start writing a project instead of just dabbling in tutorials/examples. While doing my research, I've found that Erlang seems to be a pretty powerful when it comes to writing concurrent software (which is my goal), but resources and tools for development aren't as mature as Microsoft development products. F# can run on linux (Mono) so that requirement is met, but while looking around on the internet I cannot find any comparisons of F# vs Erlang. Right now, I am leaning towards Erlang just because it seems to have the most press, but I am curious if there is really any performance difference between the two languages. Since I am use to developing in .NET, I can probably get up to speed with F# a lot faster than Erlang, but I cannot find any resource to convince me that F# is just as scalable as Erlang. I am most interested in simulation, which is going to be firing a lot of quickly processed messages to persistant nodes. If I have not done a good job with what I am trying to ask, please ask for more verification.

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  • What makes Erlang suitable for cloud applications?

    - by Duncan
    We are starting a new project and implementing on our corporations's instantiation of an openstack cloud (see http://www.openstack.org/). The project is security tooling for our corporation. We currently run many hundreds of dedicated servers for security tools and are moving them to our corporations instantiation of openstack. Other projects in my company currently use erlang in several distributed server applications, and other Q/A point out erlang is used in several popular cloud services. I am trying to convince others to consider where it might be applicable on our project. What are erlang's strengths for cloud programming? Where are areas it is particularly appropriate to use erlang?

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  • Ideas for an Erlang Application [closed]

    - by user1640228
    I'm just about to finish an Erlang book and I've done plenty of hacking on trivial things outside of reading the book. Now I want to crank thinks up and build an app that really makes use of many of Erlang and OTP's big features. I've got a few sketches of a highly-available music delivery system backed up by a riak cluster. Would love some help to inspire my project and help me into designing the system the way a professional Erlanger would.

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  • Newbie, deciding Python or Erlang

    - by Joe
    Hi Guys, I'm a Administrator (unix, Linux and some windows apps such as Exchange) by experience and have never worked on any programming language besides C# and scripting on Bash and lately on powershell. I'm starting out as a service provider and using multiple network/server monitoring tools based on open source (nagios, opennms etc) in order to monitor them. At this moment, being inspired by a design that I came up with, to do more than what is available with the open source at this time, I would like to start programming and test some of these ideas. The requirement is that a server software that captures a stream of data and store them in a database(CouchDB or MongoDB preferably) and the client side (agent installed on a server) would be sending this stream of data on a schedule of every 10 minutes or so. For these two core ideas, I have been reading about Python and Erlang besides ruby. I do plan to use either Amazon or Rackspace where the server platform would run. This gives me the scalability needed when we have more customers with many servers. For that reason alone, I thought Erlang was a better fit(I could be totally wrong, new to this game) and I understand that Erlang has limited support in some ways compared to Ruby or Python. But also I'm totally new to the programming realm of things and any advise would be appreciated grately. Jo

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  • Distributed transactions and queues, ruby, erlang

    - by chrispanda
    I have a problem that involves several machines, message queues, and transactions. So for example a user clicks on a web page, the click sends a message to another machine which adds a payment to the user's account. There may be many thousands of clicks per second. All aspects of the transaction should be fault tolerant. I've never had to deal with anything like this before, but a bit of reading suggests this is a well known problem. So to my questions. Am I correct in assuming that secure way of doing this is with a two phase commit, but the protocol is blocking and so I won't get the required performance? It appears that DBs like redis and message queuing system like Rescue, RabbitMQ etc don't really help me a lot - even if I implement some sort of two phase commit, the data will be lost if redis crashes because it is essentially memory-only. All of this has led me to look at erlang - but before I wade in and start learning a new language, I would really like to understand better if this is worth the effort. Specifically, am I right in thinking that because of its parallel processing capabilities, erlang is a better choice for implementing a blocking protocol like two phase commit, or am I confused?

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  • Erlang web frameworks survey

    - by Zachary K
    (Inspired by similar question on Haskel) There are several web frameworks for Erlang like Nitrogen, Chicago Boss, and Zotonic, and a few more. In what aspects do they differ from each other? For example: features (e.g. server only, or also client scripting, easy support for different kinds of database) maturity (e.g. stability, documentation quality) scalability (e.g. performance, handy abstraction) main targets Also, what are examples of real-world sites / web apps using these frameworks?

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  • What are the relative merits for implementing an Erlang-style "Continuation" pattern in C#

    - by JoeGeeky
    What are the relative merits (or demerits) for implementing an Erlang-style "Continuation" pattern in C#. I'm working on a project that has a large number of Lowest priority threads and I'm wondering if my approach may be all wrong. It would seem there is a reasonable upper limit to the number of long-running threads that any one Process 'should' spawn. With that said, I'm not sure what would signal the tipping-point for too many thread or when alternate patterns such as "Continuation" would be more suitable. In this case, many of the threads do a small amount of work and then sleep until woken to go again (Ex. Heartbeat, purge caches, etc...). This continues for the life of the Process.

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  • Erlang web frameworks survey

    - by Zachary K
    (Inspired by similar question on Haskel) There are several web frameworks for Erlang like Nitrogen, Chicago Boss, and Zotonic, and a few more. In what aspects do they differ from each other? For example: features (e.g. server only, or also client scripting, easy support for different kinds of database) maturity (e.g. stability, documentation quality) scalability (e.g. performance, handy abstraction) main targets Also, what are examples of real-world sites / web apps using these frameworks? EDIT: Starting a bounty in hopes that it will get some conversation going

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  • Erlang node acts like it connects, but doesn't [migrated]

    - by Malfist
    I'm trying to setup a distributed network of nodes across a few firewalls and it's not going so well. My application is structured like this: there is a central server that always running a node ([email protected]) and my co-worker's laptops connect to it on startup. This works if we're all in the office, but if someone is at home, they can connect to the masternode, but they fail to connect to the other nodes in the swarm. I.E., erlang fails to gossip correctly. To correct this, I've change epmd's port number and changed the inet_dist_listen ports to a known open port (1755 and 7070 respectively). However, something fishy is going on. I can run net_adm:world() and it reports that it connects to master node, but when I run nodes() I get an empty array. Same with net_adm:ping('[email protected]'). See: Eshell V5.9 (abort with ^G) ([email protected])1> net_adm:world(). ['[email protected]'] ([email protected])2> nodes(). [] ([email protected])3> net_adm:ping('[email protected]'). pong ([email protected])4> nodes(). [] ([email protected])5> What's going on, and how can I fix it?

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  • Veewee, Vagrant, Puppet, Erlang and RabbitMQ

    - by Tobias
    I am kinda stuck with a problem I am trying to wrap my head around for days now. Here is what I am doing: By using Veewee, I am creating a VirtualBox image and then I create a Vagrant box from it. See here, here Finally I run puppet from Vagrant to install RabbitMQ, see here. Veewee, Vagrant and VirtualBox all run on MacOS X 10.7.4. The vagrant box itself is CentOS 6.2. This worked fine for quite some time until I was recreating the VirtualBox image a couple of days ago. During installation of the rabbitmq-plugins during my puppet run I now get the following error: /Stage[main]/Rabbitmq/Exec[rabbitmq-plugins]/returns: erlexec: HOME must be set My RabbitMQ puppet configuration can be found on my GitHub repo for that project, but here is the most important part: $version = "2.8.7" $url = "http://www.rabbitmq.com/releases/rabbitmq-server/v${version}/rabbitmq-server-${version}-1.noarch.rpm" package{"erlang": ensure => "present", } package{"rabbitmq-server": provider => "rpm", source => $url, require => Package["erlang"] } exec{"rabbitmq-plugins": path => "/usr/bin:/usr/sbin:/bin", command => "rabbitmq-plugins enable rabbitmq_management", require => Package["rabbitmq-server"] } My additional repositories, e.g. epel, are defined in veewees postinstall.sh right at the top of the file. Finally, this is what I get when I do '/etc/init.d/rabbitmq-server status' [{pid,2834}, {running_applications,[{rabbit,"RabbitMQ","2.8.7"}, {ssl,"Erlang/OTP SSL application","4.1.6"}, {public_key,"Public key infrastructure","0.13"}, {crypto,"CRYPTO version 2","2.0.4"}, {mnesia,"MNESIA CXC 138 12","4.5"}, {os_mon,"CPO CXC 138 46","2.2.7"}, {sasl,"SASL CXC 138 11","2.1.10"}, {stdlib,"ERTS CXC 138 10","1.17.5"}, {kernel,"ERTS CXC 138 10","2.14.5"}]}, {os,{unix,linux}}, {erlang_version,"Erlang R14B04 (erts-5.8.5) [source] [64-bit] [rq:1] [async-threads:30] [kernel-poll:true]\n"}, {memory,[{total,24993120}, {processes,10328496}, {processes_used,10321296}, {system,14664624}, {atom,1175905}, {atom_used,1143841}, {binary,17192}, {code,11416020}, {ets,766168}]}, {vm_memory_high_watermark,0.4}, {vm_memory_limit,205851852}, {disk_free_limit,1000000000}, {disk_free,7089795072}, {file_descriptors,[{total_limit,924}, {total_used,4}, {sockets_limit,829}, {sockets_used,2}]}, {processes,[{limit,1048576},{used,131}]}, {run_queue,0}, {uptime,6}] Sources in the web suggest, that I have to set HOME. Of course I was logging into the box if HOME was set, for user vagrant it was '/home/vagrant' and for root it was 'root'. As always, any hints/ideas/suggestions/assumptions are more than welcome. Thanks a lot! Cheers, Tobi

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  • Uses of Erlang in Telecom

    - by user94154
    I'm a web developer and a college student majoring in telecommunications. This means I'm decent at programming and I know a little about telecom networks (at a high, non-technical level). I keep reading that Erlang is used all over the telecom industry (supposedly for its performance). I'm wondering if there's anyway I can combine my programming skills with my telecommunications major with Erlang. Is most of the Erlang/telecom stuff closed source? Are there any open source telecom projects written Erlang? UPDATE: sipwiz's comment makes me think in terms of a question larger than "uses of Erlang". How can I leverage a high-level understanding of telecom networks and the telecom regulatory environment with programming. I hope this hasn't veered too off-topic for SO.

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  • How do I install LFE on Ubuntu Karmic?

    - by karlthorwald
    Erlang was already installed: $dpkg -l|grep erlang ii erlang 1:13.b.3-dfsg-2ubuntu2 Concurrent, real-time, distributed function ii erlang-appmon 1:13.b.3-dfsg-2ubuntu2 Erlang/OTP application monitor ii erlang-asn1 1:13.b.3-dfsg-2ubuntu2 Erlang/OTP modules for ASN.1 support ii erlang-base 1:13.b.3-dfsg-2ubuntu2 Erlang/OTP virtual machine and base applica ii erlang-common-test 1:13.b.3-dfsg-2ubuntu2 Erlang/OTP application for automated testin ii erlang-debugger 1:13.b.3-dfsg-2ubuntu2 Erlang/OTP application for debugging and te ii erlang-dev 1:13.b.3-dfsg-2ubuntu2 Erlang/OTP development libraries and header [... many more] Erlang seems to work: $ erl Erlang R13B03 (erts-5.7.4) [source] [64-bit] [smp:2:2] [rq:2] [async-threads:0] [hipe] [kernel-poll:false] Eshell V5.7.4 (abort with ^G) 1> I downloaded lfe from github and checked out 0.5.2: git clone http://github.com/rvirding/lfe.git cd lfe git checkout -b local0.5.2 e207eb2cad $ configure configure: command not found $ make mkdir -p ebin erlc -I include -o ebin -W0 -Ddebug +debug_info src/*.erl #erl -I -pa ebin -noshell -eval -noshell -run edoc file src/leex.erl -run init stop #erl -I -pa ebin -noshell -eval -noshell -run edoc_run application "'Leex'" '"."' '[no_packages]' #mv src/*.html doc/ Must be something stupid i missed :o $ sudo make install make: *** No rule to make target `install'. Stop. $ erl -noshell -noinput -s lfe_boot start {"init terminating in do_boot",{undef,[{lfe_boot,start,[]},{init,start_it,1},{init,start_em,1}]}} Crash dump was written to: erl_crash.dump init terminating in do_boot () Is there an example how I would create a hello world source file and compile and run it?

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  • Erlang "must-have" development tools

    - by Jonas
    I am not a professional Erlang developer (not yet), but I would like to hear what Erlang development tools are "must-have" in the industry (besides emacs and git/mercurial) ? I do know about a few tools like: rebar, dialyzer, hipe, eunit and edoc but I have no idea if they are used by professional erlang developers or if there are other tools that are "must-have". This question is inspired by Java "must-have" development tools

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  • Do Scala and Erlang use green threads?

    - by CHAPa
    I've been reading a lot about how Scala and Erlang does lightweight threads and their concurrency model (actors). However, I have my doubts. Do Scala and Erlang use an approach similar to the old thread model used by Java (green threads) ? For example, suppose that there is a machine with 2 cores, so the Scala/Erlang environment will fork one thread per processor? The other threads will be scheduled by user-space (Scala VM / Erlang VM ) environment. Is this correct? Under the hood, how does this really work?

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  • What is your experience with Nitrogen on Erlang?

    - by Yuval A
    I've been checking out the Nitrogen Project which is supposed to be the most mature web development framework for Erlang. Erlang, as a language, is extremely impressive. However, with regards to Nitrogen, what I am not too keen about is using Erlang's rather uncommon syntax (unless you're native in PROLOG) to build UIs. What is your experience with it as opposed to other mainstream web frameworks such as Django or Rails?

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  • Scala/Erlang use something like greenThread or not ?

    - by CHAPa
    Hi all, Im reading a lot about how scala/Erlang does lightweight threads and your concurrency model ( Actor Model ). Off course, some doubts appear in my head. Scala/Erlang use a approach similar to the old thread model used by java (greenThread) ? for example, suppose that there is a machine with 2 cores, so the scala/erlang environment will fork one thread per processor ? The other threads will be scheduled by user-space( scala VM / erlang vm ) environment. is it correct ? how under the hood that really work ? thanks a lot.

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  • Erlang programming exercises

    - by valya
    I'm learning Erlang. I've moved from Haskell so I don't want to and have to learn functional programming. But Erlang is quite specific because of the microprocesses. So, can you give me some examples which will be simple to test and measure and use all the power of Erlang?

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  • Erlang on a JVM/CLR

    - by Fortyrunner
    I've just started reading Joe Armstrongs book on Erlang and listened to his excellent talk on Software Engineering Radio. Its an interesting language/system and one whose time seems to have come around with the advent of multi-core machines. My question is: what is there to stop it being ported to the JVM or CLR? I realise that both virtual machines aren't setup to run the lightweight processes that Erlang calls for - but couldn't these be simulated by threads? Could we see a lightweight or cutdown version of Erlang on a non Erlang VM?

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