From: "Shot (Piotr Szotkowski)" <shot@...>
Date: 2008-10-20T05:26:09+09:00
Subject: Re: Running Multiple Versions of Ruby on Debian?

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John Griffiths:

> Has anyone had any experiences in running
> multiple versions of Ruby on Debian Etch?

I run hand-compiled Ruby 1.8.6, 1.8.7 and 1.9.0 alongside
each other by putting them in ~/opt with, for example,
=2E/configure --prefix=3D/home/shot/opt/ruby-1.8.7-p72

I then have ~/opt/ruby-1.8.7 symling poiting to it, plus

export PATH_ORIG=3D"$PATH"
export PATH=3D"/var/lib/gems/1.8/bin:$PATH_ORIG"

in my ~/.bashrc plus

alias r7=3D'export PATH=3D"/home/shot/opt/ruby-1.8.7/bin:$PATH_ORIG"'
alias r8=3D'export PATH=3D"/home/shot/opt/ruby-1.8.6/bin:$PATH_ORIG"'
alias r9=3D'export PATH=3D"/home/shot/opt/ruby-1.9.0/bin:$PATH_ORIG"'

in my ~/.bash_aliases =E2=80=93 this way I get the system=E2=80=99s Ruby+Ru=
byGems by
default and can switch to my hand-compiled environment when I want to
run Ruby 1.8.6, 1.8.7 or 1.9.0.

Ruby 1.9 comes with RubyGems, in the cases of Ruby 1.8 you need to
download the tarball and then run `ruby setup.rb` with the proper,
hand-compiled Ruby binary.

I hand-compile 1.8.6 because Debian and Ubuntu by
default --enable-pthreads which is a performance killer.

export CFLAGS=3D'-O3 -march=3Dnative'
should also boost performance, but in
my case the differences are neglible.

-- Shot
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