Erjang

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JVM Container

Kresten Krab Thorup

CTO – Responsible for technical strategy, researchingfuture technologies, and JAOO and Qconconferences.

GCC gcjGNU Objective-C Objective-C

Benchmarks

Erlang file consoleFile system

Does it work ?•  It can boot Erlang/OTP to the Eshell (ej command). •  Theres a GUI console (ejc command) which supports ^G and line edi0ng. The console s0ll needs some work [Swing wizards welcome here]. •  Run Erlang distribu0on, tcp/ip, port commands (stdio to external processes). •  You can run the compiler (c(foo) command in the prompt) •  It runs mnesia with distribu0on across Erjang/BEAM nodes. •  The HTTP packet parsers are in the tcp/ip stack, so mochiweb and webmachine can run (without crypto for now). •  Larger systems like rabbitmq and riak can boot; and works for basic cases ... but its not ready for prime 0me yet. •  Etc. etc. Lots of stuﬀ work.

BUT!!!•  A few BEAM instruc0on are missing some run0me support. •  There are also BIFs missing, or only par0ally implemented; were quite careful to throw @erjang.NotImplemented@ in BIFs (or branches thereof) which are not complete. •  Many OTP modules need NIFs or linked-‐in drivers that are en0rely missing or only partly implemented.

References•  https://github.com/trifork/erjang•  http://www.infoq.com/presentations/Erjang-A-JVM- based-Erlang-VM•  http://www.javalimit.com/2009/12/erjang-why.html•  http://learnyousomeerlang.com/contents

Questions ??? Social network informa0on http://twitter.com/jefersonm https://github.com/jefersonm/Jéferson MachadoSo#ware Design http://facebook.com/jefe.machado http://slideshare.net/jefersonm

Erjang

by Jéferson Machado

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