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MagLev Alpha

Minimum Requirements

  • 64-bit hardware. There are no plans for a 32-bit version.

  • 64-bit Linux, Mac OS X, or Solaris X86 operating system

  • a version of ruby and rake to use during installation

  • root access so you can increase default shared memory settings (only during initial install)

Install MagLev

There are three ways to install MagLev:

  • Use the installer

  • Install with Ruby Version Manager (RVM)

  • Install from GitHub

Use the installer

We recommend this version unless you want to participate in MagLev development or want access to the absolute latest code. This version changes more slowly than the github version, and it has undergone more testing.

You'll need to know a version number to install. The MagLev Alpha version on 2011-10-01 is 26955. Check for later versions on Twitter or the MagLev Discussion Google Group.

  1. Select a directory to put MagLev in. Its name doesn't matter.

  2. Download and unzip into the directory you've selected.

  3. If this is the first time you're installing MagLev, run:

    ./ 26955

    If you've already run on the machine, then you can use the upgrade script:

    ./ 26955 runs one-time machine checks and configuration that ensure your hardware will run MagLev. These mostly relate to shared memory settings. It's safe to run multiple times and it won't overwrite things it's already done. does not perform these checks. Both scripts accept a version number as a parameter.

The installer is somewhat verbose. That's so you can more easily debug installation problems.

Note: This installer/updater creates a separate directory for each new version of MagLev. Reverting to an older version is as simple as stopping MagLev, changing $MAGLEV_HOME to point to the prior version, and restarting.

Install with Ruby Version Manager (RVM)

RVM is useful if you want to compare behavior of various Ruby implementations or versions of MagLev. Install using:

rvm install maglev

See the rvm home page for details of using RVM.

RVM will automatically start a MagLev server when you rvm use maglev. That server is left running if you rvm use any_other_Ruby.

To stop your MagLev server:

rvm use maglev
maglev stop

Note: maglev stop will only stop the version of MagLev currently in use. If you're using more than one, you'll have to maglev stop each of them – e.g.

rvm use maglev-26436
maglev stop
rvm use maglev-head
maglev stop

ProTip: To kill all the MagLev servers rather than shut them down gracefully, run ps -ef | grep /sys/stoned and kill the stoned processes that show up. It takes a short time before they shut down, as they do a bit of cleanup first.

Note: When running rake from MagLev, you cannot perform tasks which affect MagLev itself, like rake maglev:stop. You have to use the bin/maglev shell script instead.

Install from GitHub

This version is best for MagLev contributors and for developers who want to live on the bleeding edge or use git functionality. It can be less stable than the zipped version.

  1. Clone the MagLev github repository

    git clone git://
  2. Install the VM. If this is the first time you're installing MagLev, run:


    If you've already run on the machine, then you can use the upgrade script:


To use MagLev, you need to run at least once. After that, everytime you git pull, you need to run to ensure you have the corresponding GemStone 3.x binaries. Otherwise, you might get version skew that prevents MagLev from running correctly. I'll tweet about any 'git only' updates, but if you're more than one update behind you still might need to run You don't need to know a version number to install. The installer/updater figures that out from the version.txt file.

You'll have all the functionality of git, but unless you create a new clone for each release, you may be unable to revert to an earlier version. Why? The install/upgrade script creates a new copy of the MagLev data repository including persistent kernel code. The scripts make one level of backup, but we won't be providing migration scripts during Alpha.

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