gistfile1.txt

Original details here: http://www.engineyard.com/blog/2010/monitoring-memory-with-jruby-part-1-jhat-and-visualvm/

Debugging memory in logstash with this:

```
# Run JRuby with special flag
% ruby -J-Djruby.reify.classes=true --1.9 bin/logstash agent ...
```

```
% jmap -histo:live $(jps | awk '/Main/ { print $1 }') | grep -F ' rubyobj' | head -10   
  41:         10093         242232  rubyobj.FTW.Connection
 166:           387           9288  rubyobj.Gem.Version
 167:           375           9000  rubyobj.Gem.Requirement
 200:           208           4992  rubyobj.Gem.Dependency
 298:            83           1992  rubyobj.Gem.Specification
 537:            12            288  rubyobj.LogStash.Event
 623:            10            240  rubyobj.Gem.Platform
 700:             7            168  rubyobj.Cabin.Metrics
1042:             5            120  rubyobj.OptionParser.Switch.NoArgument
1046:             5            120  rubyobj.Cabin.Metrics.Timer
```