How to Compile Ruby

How to compile Ruby?

The simple answer is that you can't, at least with MRI 1.8 (the standard). This is because 1.8 works by walking the Abstract Syntax Tree. Python, Ruby 1.9, JRuby, and Rubinius use byte code, which allows compilation to an Intermediate Representation (byte code). From MRI Ruby 2.3 it has become easy to do this, see this answer below.

With Rubinius, you can do something as described in this post: http://rubini.us/2011/03/17/running-ruby-with-no-ruby/

In JRuby you can use the "Ahead Of Time" compiler through, I believe, jrubyc.

This isn't really the standard way of doing things and you're generally better off just letting your Ruby implementation handle it like it wants to. Rubinius, at least, will cache byte code after the first compilation, updating it as it needs to.

how to compile a ruby code on my vim-editor for very simple and easy way... or some trick

You can use :!! to repeat the last :!{cmd}.

You can type :!ruby % once, and then run :!!, which can of course be mapped to a key like:

nnoremap <F8> :!!<CR>

Or to write and run it (saves typing :w):

nnoremap <F8> :w<CR>:!!<CR>

This is a flexible solution, since you can replace :!ruby % with anything else (e.g. :!coffee -c %, :!python %, etc.).

How to compile ruby with RVM on a low memory system?

Creating a 512MB swap-file solved the problem. Here are the steps:

sudo mkdir -p /var/cache/swap/
sudo dd if=/dev/zero of=/var/cache/swap/swap0 bs=1M count=512
sudo chmod 0600 /var/cache/swap/swap0
sudo mkswap /var/cache/swap/swap0 
sudo swapon /var/cache/swap/swap0

The swap file is not used after a restart. It can be integrated in /etc/fstab to use it after restart:

 /var/cache/swap/swap0    none    swap    sw      0 0

The above steps to create a swap-file I found here (in German): http://wiki.ubuntuusers.de/Swap#Swap-als-Datei - licence for the above content: http://creativecommons.org/licenses/by-nc-sa/2.0/de/deed.en (Attribution-NonCommercial-ShareAlike 2.0 Germany (CC BY-NC-SA 2.0 DE))

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