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MagLev (software)

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Title: MagLev (software)  
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Subject: Ruby (programming language), Ruby Version Manager, Ruby Document format, Ruby Central, Mruby
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MagLev (software)

Developer(s) GemTalk Systems
Initial release 2008 (2008)
Stable release 1.2.0 Alpha 4 / May 17, 2013 (2013-05-17)
Written in Smalltalk, Ruby
Operating system Cross-platform: Solaris, AIX, Linux, Mac OS X
Platform GemStone/S
Type Ruby programming language interpreter
License MIT, GPL, others[1]
Website .com.githubmaglev

MagLev is an alternative implementation of the Ruby programming language built on the GemStone/S virtual machine from GemTalk Systems.


MagLev runs inside an image like Smalltalk, offering transparent object persistence[2][3] to Ruby objects and classes. Object persistence is based on ACID transactions that allow multiple running instances to see a shared object graph. MagLev uses a process-based concurrency model, mapping Ruby threads to Smalltalk Processes[4], which are scheduled in the VM as green threads.

Ruby Compatibility

MagLev targets Ruby 1.8.7 and runs a significant number of RubySpec. It supports several C extensions including Nokogiri, JSON and bcrypt.

Gemstone/S Resources

  • GemStoneS 64 bit 3.1.x Documentation, July 3, 2012, retrieved July 29, 2012 


  1. ^
  2. ^ "Programming Guide for GemStone/S 64 Bit Version 1",  
  3. ^ "MagLev – Object Persistence with Ruby and Smalltalk", Bachelor thesis,  
  4. ^ Phoenix, Evan (October 14, 2011), "Ruby, Concurrency, and You",  

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