Testing how big the overhead of ruby timeout is

timeout_benchmark.rb

require 'benchmark'
require 'timeout'

N = 10_000

def just_loop
  N.times do |i|
    i + 1
  end
end

def span_threads
  N.times do |i|
    t = Thread.start do
      i + 1
    end
    # make sure there is only one thread
    t.join
  end
end

def with_timeout
  N.times do |i|
    Timeout::timeout(1) do
      i + 1
    end
  end
end


Benchmark.bm(7) do |x|
  x.report("threads")     { span_threads }
  x.report("with timeout"){ with_timeout }
  x.report("just loop")   { just_loop    }
end