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README.rdoc
ruby187gc.patch

README.rdoc

Garbage Collection patch for Ruby 1.8.7 interpreter

This is a port of the Ruby 1.8.6 GC Patch over to Ruby 1.8.7. I wrote it based on Ruby 1.8.7 patch level 302, but it will probably patch earlier versions of Ruby 1.8.7 without any trouble. This makes it possible to use RubyProf and other tools with Rails 3 for the first time. To install and use it, run the patch command on your Ruby 1.8.7 source folder. Here's an example using rvm:

$ rvm install ruby-1.8.7-p302
Installing Ruby from source to: /Users/pat/.rvm/rubies/ruby-1.8.7-p302
Extracting ruby-1.8.7-p302 ...
Configuring ruby-1.8.7-p302, this may take a while depending on your cpu(s)...
Compiling ruby-1.8.7-p302, this may take a while, depending on your cpu(s)...
etc...

$ cd ~/.rvm/src/ruby-1.8.7-p302
$ git clone https://patshaughnessy@github.com/patshaughnessy/ruby187gc.git
$ cat ruby187gc/ruby187gc.patch | patch -p0
patching file gc.c
patching file intern.h

$ make
gcc -g -O2 -pipe -fno-common    -DRUBY_EXPORT  -I. -I.  -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE   -c array.c
gcc -g -O2 -pipe -fno-common    -DRUBY_EXPORT  -I. -I.  -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE   -c bignum.c
gcc -g -O2 -pipe -fno-common    -DRUBY_EXPORT  -I. -I.  -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE   -c class.c
etc...

$ make install
./miniruby -I./lib -I.ext/common -I./- -r./ext/purelib.rb  ./instruby.rb --make="make" ...
installing binary commands
installing command scripts
installing library scripts
installing headers
installing manpages
installing extension objects
installing extension scripts

Now your version of Ruby has the extra GC support; for example:

$ rvm ruby-1.8.7-p302
$ irb
ruby-1.8.7-p302 > ObjectSpace.live_objects
 => 20948 
ruby-1.8.7-p302 > GC.enable_stats
 => false 
ruby-1.8.7-p302 > GC.allocated_size
 => 3332