Re: Import gem to Ruby 1.9

On Aug 3, 2007, at 12:13 PM, Jonas Pfenniger wrote:

> 2007/7/26, NAKAMURA, Hiroshi <[e-mail]>:
> -----BEGIN PGP SIGNED MESSAGE-----
> This mail is for the topic
> '6. What libraries does RubyGems depend on?'
>
> NAKAMURA, Hiroshi wrote:
> > 6. What libraries does RubyGems depend on?
> >      YAML/Syck, WEBrick, the digest libraries, rbconfig, rdoc,  
> thread,
> >      optparse, forwardable, time, openssl, open-uri, uri, net/http,
> >      fileutils, zlib, stringio, socket, tempfile, pathname
>        + test/unit
>
> Here is a small script to check the number of loaded classes before  
> and after rubygems. The second number only includes top level classes.
>
> Last time I checked, rubygems used more than one top level class to  
> host it's code.
>
> -----
> def count_classes
>     x=0; t=0
>     ObjectSpace.each_object(Class) do |c|
>         x+=1
>         t+=1 if c.name !~ /::/
>     end
>     [x, t]
> end
>
> puts "Without rubygems : #{count_classes.inspect}"
> require 'rubygems'
> puts "With rubygems : #{count_classes.inspect}"
>
> -----
>
> Without rubygems : [183, 59]
> With rubygems : [469, 76]

To this effect, what about structuring rubygems so that not all of  
it's classes are loaded all the time.

There are 2 use scenarios for "require 'rubygems'". One is typically  
one, to be able to use the code contained in gems, the other is for  
the 'gem' command to be able to do all it's manipulation and fetching  
of gems.

Currently, "require 'rubygems'" is built for the 2nd scenario, but  
thats probably incorrect, since that scenario is used vastly less  
than scenario one.

If "require 'rubygems'" only included enough code be able to properly  
alter the load path to allow a gem's code to be used, it would make  
almost no impact on performance, where as now, it includes a huge  
amount of unused code into every runtime.

Scenario 2 could easily covered by adding "require 'rubygems/dev'"  
which would include the current bevy of classes and code.

After all, what generic rails app uses the TarReader class that  
rubygems imports? For that that matter, what part of the rubygems  
runtime (scenario 1) uses TarReader?

  - Evan Phoenix

>
> -- 
> Cheers,
>   zimbatm