module BenchmarkDriver::Rvm

def self.system_ruby_path

Execute "which -a ruby" command to get a list of Ruby versions from $PATH. 
def self.system_ruby_path
  env_rubies = `which -a ruby`
  abort "Failed to execute 'which -a ruby'" unless $?.success?
  env_rubies.each_line do |line|
    if !line.match(ENV['rvm_path'])
      return line.rstrip
    end
  end
  abort "System ruby not found"
end