Benchmarking along with http://blog.honeybadger.io/benchmarking-exceptions-in-ruby-yep-theyre-slow

benchmark.rb

# http://blog.honeybadger.io/benchmarking-exceptions-in-ruby-yep-theyre-slow

# $ ruby -v
# ruby 2.2.2p95 (2015-04-13 revision 50295) [x86_64-darwin13]
#
# $ ruby benchmark.rb
# Calculating -------------------------------------
#     method exception    41.808k i/100ms
#      begin exception    40.051k i/100ms
#                break    99.442k i/100ms
#               return   100.254k i/100ms
#                throw    76.345k i/100ms
# -------------------------------------------------
#     method exception    573.549k (± 9.7%) i/s -      2.843M
#      begin exception    574.784k (± 8.3%) i/s -      2.884M
#                break      2.881M (± 9.7%) i/s -     14.320M
#               return      2.773M (±10.6%) i/s -     13.735M
#                throw      1.591M (±10.2%) i/s -      7.864M


# $ ruby -v
# jruby 9.0.0.0 (2.2.2) 2015-07-21 e10ec96 Java HotSpot(TM) 64-Bit Server VM 24.51-b03 on 1.7.0_51-b13 +jit [darwin-x86_64]
#
# $ ruby benchmark.rb
# Calculating -------------------------------------
#     method exception   525.000  i/100ms
#      begin exception     1.042k i/100ms
#                break    59.452k i/100ms
#               return    60.555k i/100ms
#                throw    40.076k i/100ms
# -------------------------------------------------
#     method exception     11.861k (± 9.1%) i/s -     58.800k
#      begin exception     11.766k (± 8.5%) i/s -     58.352k
#                break      1.082M (± 6.8%) i/s -      5.410M
#               return      1.102M (± 6.7%) i/s -      5.511M
#                throw    588.593k (± 8.2%) i/s -      2.926M


# $ ruby -v
# rubinius 2.5.7 (2.1.0 d4fdeaad 2015-06-16 3.5.1 JI) [x86_64-darwin14.4.0]
#
# $ ruby benchmark.rb
# Calculating -------------------------------------
#     method exception    23.407k i/100ms
#      begin exception    51.847k i/100ms
#                break   182.347k i/100ms
#               return   196.666k i/100ms
#                throw    48.064k i/100ms
# -------------------------------------------------
#     method exception    682.386k (± 7.8%) i/s -      3.394M
#      begin exception    652.175k (± 5.5%) i/s -      3.266M
#                break      2.689M (± 5.5%) i/s -     13.494M
#               return      2.535M (± 8.3%) i/s -     12.587M
#                throw    625.740k (± 4.6%) i/s -      3.124M


require 'benchmark/ips'

def exit_via_exception_rescued_at_method
  5.times do
    raise RuntimeError
  end
rescue
end

def exit_via_exception_rescued_in_begin
  begin
    5.times do
      raise RuntimeError
    end
  rescue
  end
end

def exit_via_break
  5.times do
    break
  end
end

def exit_via_return
  5.times do
    return
  end
end

def exit_via_throw
  catch :done do
    5.times do
      throw :done
    end
  end
end

Benchmark.ips do |x|
  x.report("method exception") { exit_via_exception_rescued_at_method }
  x.report("begin exception")  { exit_via_exception_rescued_in_begin  }
  x.report("break")            { exit_via_break                       }
  x.report("return")           { exit_via_return                      }
  x.report("throw")            { exit_via_throw                       }
end