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< Advanced Erlang/OTP ~ I am new to Erlang and how can i demonstrate that Erlang ser |
| francesco |
 Posted: Fri Jul 06, 2007 5:12 pm |
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Joined: 07 Jul 2006
Posts: 249
Location: London
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Before committing to a project, you need to make sure you have made the right design decisions and ensure mistakes are done in a small scale, and not in a production environment. The solution is design by prototyping. All successful Erlang projects are always started with a prototype, the results of which should be enough to provide a go no go solution for management. Most prototypes take 4 - 6 weeks and usually involve 1 - 2 developers. This excludes the Erlang learning curve.
The closest published example of what you want to do is the MMOG paper presented at the Erlang User Conference in 2006. The paper and presentation are here:
http://www.erlang-consulting.com/thesis/mmog_server_in_erlang.html
http://www.erlang-consulting.com/euc2005/mmog/mmog_in_erlang.htm
And to answer your questions, I would go for a Java client and Erlang server side. To load test your server, TSUNG is a good tool. It is the same tool used to stress test the MMOG servers in the above presentation. Also, what you want to demonstrate in a comparison to a java server are
scalability (simultaneous concurrently active user)
reliability (ease at handling user / system crashes)
distribution (ease to add nodes / processiong power)
system behaviour under heavy load
None of the above can compete with Java. I will leave suggestions on existing tests and examples to others to reply.
Regards,
Francesco |
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| carrie |
| Posted: Thu Jul 12, 2007 5:58 pm |
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Joined: 06 Jul 2007
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Sorry I didn't know my post was moved to here. I am looking into Tsung now. Hope I can use it to give a test first.
Many thanks. Come back later |
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| michal |
| Posted: Thu Jul 12, 2007 7:26 pm |
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Joined: 20 Jul 2006
Posts: 44
Location: London
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Hi,
I think your post has been moved by accident.
To demonstrate how well an Erlang system can scale, I would suggest setting up the ejabberd server and stress test it with the tsung tool and its jabber plugin. Tsung can generate graphs with number of connected users, CPU utilization, response times, etc.
Michal |
_________________
http://www.erlang-consulting.com |
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| francesco |
| Posted: Fri Jul 13, 2007 9:20 am |
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Joined: 07 Jul 2006
Posts: 249
Location: London
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Hi Carrie,
I moved your post to the Erlang Forum as you put it in the Erlang Mailing list section, but are not subscribed there. That means that the post is not forwarded to the Erlang Questions mailing list, and is just posted on trapexit, and chances of some one picking it up are smaller. (See http://forum.trapexit.org/viewtopic.php?t=5940) But in doing so, I did the mistake in trying to delete it from the erlang mailing list section, as it also deleted it from the Erlang section. We are trying to figure out how to put it back without upsetting the thread.
I second Michal's idea. Run ejabberd and tsung. It will generate pretty graphs managers love while demonstrating the true capacity of Erlang based systems.
Francesco |
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| carrie |
| Posted: Fri Jul 13, 2007 11:38 am |
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Joined: 06 Jul 2007
Posts: 3
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Great! Thanks Francesco and Michal!
I need to learn how to use the test tools... And another question, do I need to write an Erlang server and client to test?... sorry for the stupid question.
You guys are all in London? Me too!! |
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| carrie |
| Posted: Fri Jul 13, 2007 12:21 pm |
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Joined: 06 Jul 2007
Posts: 3
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Sorry. I get it. ejabbered is a server written in erlang, I can use tsung to simulate users to test the server.
Can this all be done in a single computer?
I don't know how to install tsung... my system is XP, which file should i download to install?
keep trying... |
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| francesco |
| Posted: Fri Jul 13, 2007 2:12 pm |
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Joined: 07 Jul 2006
Posts: 249
Location: London
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Both tsung and ejabberd are written in Erlang. If you google them, you should find lots of tutorials and demos. You can run them on a single computer, but I would have a load machine and a server.
If you want to demonstrate real speed at setting up connections and traffic throughput, however, I would stay well away from XP and use Linux or some other UNIX derivative.
Good luck,
Francesco |
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