From: Roger Pack <rogerdpack2@...>
Date: 2012-10-12T00:42:45+09:00
Subject: Re: [ANN] google_hash v 0.7.0 released. Faster hashes for MRI.

> From the readme:
>
>> These also use significantly less memory, because (if you specify IntToInt, it stores only 4 bytes per int, instead of Ruby's usual 20 bytes).  This also frees up Ruby so it doesn't hvae to garbage collect as much.  Yea!
>
> 20 bytes?? What exactly is this referring to?

Normal size (or at least used to be) of a "ruby object" in 32 bit MRI.
 I believe it's RObject:
http://fossies.org/dox/ruby-1.9.3-p194/structRObject.html
The size may be bigger in 64 bit MRI, I'm not sure.
-r