class RubyProf::Measurement

You cannot create a CallTree object directly, they are generated while running a profile.
The Measurement class is a helper class used by RubyProf::MethodInfo to store information about the method.

def children_time 

def children_time
  self.total_time - self.self_time - self.wait_time
end

def inspect 

def inspect
  super + "(#{self.to_s})"
end

def to_s 

def to_s
  "c: #{called}, tt: #{total_time}, st: #{self_time}"
end