From: "Iñaki Baz Castillo" <ibc@...>
Date: 2010-01-16T06:31:26+09:00
Subject: Re: How to know the OS architecture (32 or 64 bits)?

El Viernes, 15 de Enero de 2010, Walton Hoops escribió:
> On 1/15/2010 9:59 AM, Iñaki Baz Castillo wrote:
> > El Viernes, 15 de Enero de 2010, Iñaki Baz Castillo escribió:
> >> Note that to know the bits it uses "rbconfig" gem, and them:
> >
> > Well, "rbconfig" is not a gem but a Ruby built in library.
> >
> >> In my server RbConfig::CONFIG['host_os'] = "linux-gnu" so finally it
> >> ends doing:
> >>
> >>            if (1<<32).class == Fixnum
> >>              64
> >>            else
> >>              32
> >>            end
> >>
> >> Which is basically the same as doing
> >>
> >>    if 1.size == 8
> >>      64
> >>    else
> >>      32
> >>    end
> >
> > Definitively I don't like "os" gem at all. It could use
> > RbConfig::CONFIG['host_cpu'] rather than the not reliable
> > RbConfig::CONFIG['host_os']:
> >
> >
> > a) 32 bits host:
> >
> >    RbConfig::CONFIG['host_os']  =>  "linux-gnu"
> >    RbConfig::CONFIG['host_cpu'] =>  "i486"
> >
> > b) 64 bits host:
> >
> >    RbConfig::CONFIG['host_os']  =>  "linux-gnu"
> >    RbConfig::CONFIG['host_cpu'] =>  "x86_64"
> 
> submit a bug! http://github.com/rdp/os
> 
> My main concern with that though:
> Would RbConfig::CONFIG['host_cpu'] return "x86_64" if I'm running 32-bit
> Linux on a 64-bit CPU?

No, I've tested it in a 64 bits server running Linux 32 bits:

  RbConfig::CONFIG['host_os']  => "linux-gnu"
  RbConfig::CONFIG['host_cpu'] => "i486"
  1.size => 4

 


-- 
Iñaki Baz Castillo <ibc@aliax.net>