wikimedia/wmf-vagrant — pull request #6 by atdt (2012-11-11 08:12:24+00:00)
Title: Provision 32-bit or 64-bit VM based on host arch

What do you think, Patrick? I've tested it and it seems to work, but perhaps it hurts consistency and debugability. Maybe the right thing to do is track production and use 64-bit guests, even if it means a performance penalty for 32-bit hosts.