Erlang trading system

Explaining why it is used into a specific solution instead of others programming languages would be very much appreciated, too. Listing BAD Erlang case studies cases in which Erlang is misused it would be interesting, as well. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance.

If trading question can be reworded to fit the rules in the help centerplease edit the question. It is used trading power services such as MochiBot and MochiAds, which serve dynamically generated content to millions of viewers daily. AMQP is an emerging standard for high-performance enterprise messaging. I think it's the one of most interesting project for learning erlang because it is really building on erlang's strength.

However some will argue that it's not OTP, but don't worry there's still a trove of great code inside An XMPP server like ejabberd can be seen as a high level router, routing messages between end users. Of course there are other features, but this is the most important aspect of an instant messaging server. In fact, it was designed to solve this problem.

And given it can spawn hundreds of thousand of processes and not threadsit's a share-nothing approach, which is simpler to designejabberd is designed as a set of erlang processes which can be distributed over several servers:. Another very lovable feature of erlang is pattern matching. It is used throughout the language. That's 5 different versions of the access function. Erlang will select erlang most appropriate version given the arguments received.

Config is a structure of type config which has a type attribute. Writing scalable servers, that's the whole point of erlang. Everything is designed it making this easy. On system two previous features, I'd add:.

There is also this article from Richard Jones. The list of most common applications for Erlang as been covered CouchDb, ejabberd, RabbitMQ etc but I would like to contribute the following.

The reason why it is used in these applications comes from the core strength of Erlang: Erlang was built from ground up for the telco environment requiring that systems meet at least 5x9's availability This figure doesn't leave much room for downtime during a year! For this reason primarily, Erlang comes loaded with the following features non-exhaustive:. The built-in database Mnesia is also distributed by nature.

Vertical scalability ability to distribute jobs across processing resources on the same machine: SMP is system natively. One feature that contributes to this requirement: Note that the default process scheduler operates with O 1 scaling.

Debugging can be undertaken live with full access to any process' running state. Also the built-in error reporting tools are very useful but sometimes somewhat awkward to use.

Of course I could talk about its functional roots but this aspect is somewhat orthogonal to the main goal high availability. The main component of the functional nature which contributes generously to the target goal is, IMO: This characteristic helps contain "side effects" and reduce the need for costly synchronization mechanisms.

I guess all these characteristics help extending a case for using Erlang in business critical applications. Outside telecoms, CouchDb a document-oriented database is possibly the best known Erlang application so far. From the overview worth system in full:. The document, view, security and replication models, the special purpose query language, the efficient and robust disk layout and the concurrent system reliable nature of the Erlang trading are all carefully integrated for a reliable and efficient system.

We built a betting exchange aka prediction market using Erlang. Markets function very similarly to telephony exchanges.

Our CTO gave a talk on our use of Erlang at CTO talk. Apparently, Yahoo used Erlang to make something it calls Harvester. Article about it here: I came across this is in the process of writing up a report: Erlang in Acoustic Ray Tracing. It's an experience report on a research group's attempt to use Erlang for Acoustic Ray Tracing. They found that while erlang was easier to write the program, less buggy, etc.

It scaled worse, and performed 10x slower than a comparable C program. So one spot where it may not be well suited is CPU intensive scenarios. Do note though, that the people wrote the paper were in the stages of first learning Erlang, and may not have known the proper development procedures for CPU intensive Erlang.

It's important to realize that Erlang's 4 parts: For system, i remember reading that the floating point performance improved when Wings3d's author realized it needed to improve I can't find a source for system. And this guy just wrote about it:.

A couple years ago, Tim Bray's Wide Finder publicity and all the folks starting to do web app frameworks and HTTP servers lead at least in part to system regex and binaries handling.

And there's all the work integrating HiPE and SMP, the dialyzer project, multiple unit testing and build libs springing up. So its erlang spot is expanding, The difficult thing is that the official docs can't keep up very well, and the mailing list and erlang blogosphere volume are growing quickly.

We are using Erlang to provide the back-end muscle power for our really real-time browser-based multi-player game Pixza. Erlang don't use Flash or any other third-party plugins, though trading game is real-time multi-player.

We use pure JS and COMET techniques instead. And Erlang supports the "really realtimeliness" of Pixza. I'm working for wooga, a social game company and we use Erlang for some of our game backends trading http apis for millions of daily users and auxiliary services like ios push notification provider, payment etc. I think it really shines in network related tasks and it makes it kind of straight forward to structure and implement simple and complex network services erlang in it.

Distribution, fault tolerance and performance are easy to achieve because Erlang already has some of the key ingredients built in and they are being used for a long time in critical production infrastructure. So its trading like "the new hip technology thing 0. I know that other game companies use Erlang as well. You should be able to find presentations on slideshare about that. Erlang draws its strength from being a functional language with no shared memory. Hence IMO, Erlang won't be suitable for applications that system in place memory manipulations.

Image editing for example. By subscribing, you agree to the privacy policy and terms of service. Stack Overflow Questions Developer Jobs Documentation beta Tags Users. Sign up or log in to customize your list. Tour Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us.

Log In Sign Up. Join the Stack Overflow System. Stack Overflow is a community of 7. Join them; it only takes a minute: Where is Erlang used and why? The most popular open trading Erlang applications include the following: RamizUddin which new system are you talking about when you say "No, it's not? Binzxxxxxx Nov 7 '16 at So we have 2 features: And given it can spawn hundreds of thousand of processes and not threads system, it's a share-nothing approach, which is simpler to designejabberd is designed as a set of erlang processes which can be distributed over several servers: For instance, in the following: To wrap up Writing scalable servers, that's the whole point of erlang.

On the two previous features, I'd add: For this reason primarily, Erlang trading loaded with the following erlang non-exhaustive: One thing Erlang isn't really good at: He means things like decoding mpeg data. There is too much numerical computation which Erlang is not optimized for.

If the processing just involves shuffling big blocks of data from one place to another, then Erlang is quite good at it. You can't update shared blocks of data there are no pointers in Erlang and hence data must be shuttled across processes which in turn translate to inefficiencies. Erlang comes from Ericsson, and is used within some of their telecoms systems. From erlang overview worth reading in full: Brian Agnew k 25 CouchDB is not an OO database, it's a document-oriented database.

I GIVE TERRIBLE ADVICE - yes, erlang course. I would change your moniker: We also use CouchDB and RabbitMQ as part of our stack. Jason Trost 1 3. The resulting service is more scalable, available, reliable, and able to comply with tighter service-level agreements SLA on a lighter code base and less expensive development efforts.

CoderTao 2, 1 15 It doesn't directly make that generalization about suitability, it indicates that they found Erlang to unsuitable if you are trying to deploy on an IBM Erlang BE processor, found in the Trading 3. It also states they are inexperienced with Erlang. With more experience and suitable hardware they may have arrived at a different conclusion. Erlang get the impression that their code may trading included use of non-tail-recursive functions ; if so then it may go some way to explaining their problems with memory, garbage collection, crashes and performance.

I think you misread the article. The inability to run on a Cell processor was unfortunate, but system was only a side note. That said, they were new to the language, and may have taken a few unwise code paths I'm curious about the non-linear scaling though.

I stand corrected on the 12x performance issue with regards to the Intel versus Cell, but I maintain erlang Erlang can be well suited to CPU challenging scenarios.

That's not to say they aren't right: Perhaps this does go some way towards serving as a reminder to some folks that Erlang, like any other technology, is no silver bullet and it will only shine when used the right way in the right place. What is erlang good for? And this guy just wrote about it: Gene T 4, 1 17 ErJab 2, 7 26 John-Paul Bader 2 3.

Proclaim the Need for Net Neutrality. In it, you'll get: The week's top questions and answers Important community announcements Questions that need answers. Stack Overflow trading best with JavaScript enabled.

The problem with BAD case studies is that they don't really get famous or see the light of the day. Ramiz Uddin - which new system are you talking about when you say "No, it's not? Could you explain the following: For some of their telecomms systems. Just a note, the link to your talk is now private. Reading from the article: The paper is an interesting read.

So its sweet spot is expanding, The difficult thing is that the official docs can't keep up very well, and the mailing list and erlang blogosphere volume are growing quickly share improve this answer.