This post originated from an RSS feed registered with Ruby Buzz by Eric Hodel. Original Post: mem_inspect and png Feed Title: Segment7 Feed URL: http://blog.segment7.net/articles.rss Feed Description: Posts about and around Ruby, MetaRuby, ruby2c, ZenTest and work at The Robot Co-op. Latest Ruby Buzz Posts Latest Ruby Buzz Posts by Eric Hodel Latest Posts From Segment7

I'm pleased to announce to new libraries written by members of the Seattle Ruby Brigade, mem_inspect and png!

mem_inspect

mem_inspect is ObjectSpace.each_object on crack. mem_inspect gives you the contents of each slot in Ruby's heap. mem_inspect also includes viewers that let you visualize the contents of Ruby's heap.

To install:

sudo gem install mem_inspect

Then you'll need to build a patched ruby:

ruby_mem_inspect_build

You'll then have a ruby capable of running mem_inspect in mem_inspect_ruby_1_8.

You can make an image with:

mem_inspect_ruby_1_8/ruby_mem_inspect -S ruby_mem_dump

Which will give you a PNG in your current directory named: mem_inspect.PID.TIMESTAMP.png

You'll get an image that looks something like this:

http://flickr.com/photos/drbrain/229482312/

Bigger:

http://flickr.com/photo_zoom.gne?id=229482312&size=o

To dump a PDF any time you want:

require 'meminspect/png_viewer'

MemInspect::PNGViewer.new(1024, 768).draw

You can also dump to an AquaTerm plot window if you have RubyCocoa and AquaTerm installed.

require 'meminspect/aquaterm_viewer'

MemInspect::AquatermViewer.new(1024, 768).draw

png

png is a pure-ruby PNG writing library written by Ryan Davis.

To install:

sudo gem install png

To use:

require 'png'

canvas = PNG::Canvas.new 200, 200

# Set a point to a color
canvas[100, 100] = PNG::Color::Black

# draw an anti-aliased line
canvas.line 50, 50, 100, 50, PNG::Color::Blue

png = PNG.new canvas
png.save 'blah.png'