Fast stack

Very efficient collection of ruby backtraces, even under heavy CPU load

require 'fast_stack'

def fib( n )
  return  n  if ( 0..1 ).include? n
  ( fib( n - 1 ) + fib( n - 2 ) )
end

stacks = FastStack.profile do
  fib(30)
end

puts stacks.count # => 30

This technique was conceived by https://github.com/tmm1 , big thank you.

Ruby 2.0 uses #backtrace_locations, 1.9.3 uses #backtrace

(gem template based on https://github.com/CodeMonkeySteve/fast_xor )