Benchmarking ExecJS with therubyracer and node

gistfile1.rb

require 'benchmark'
require 'execjs'
require 'therubyracer'

js_code = '2+2'

STDOUT.sync = true

ExecJS.runtime = ExecJS::Runtimes::Node
Benchmark.bmbm(20) do |benchmark|
  benchmark.report('node.js') do
    100.times { ExecJS.eval(js_code) }
  end
end

ExecJS.runtime = ExecJS::Runtimes::RubyRacer
Benchmark.bmbm(20) do |benchmark|
  benchmark.report('therubyracer') do
    100.times { ExecJS.eval(js_code) }
  end
end

# RESULTS:
#
# Rehearsal ------------------------------------------------
# node.js        0.080000   0.050000  11.200000 ( 11.602124)
# -------------------------------------- total: 11.200000sec
# 
#                    user     system      total        real
# node.js        0.070000   0.050000  11.180000 ( 11.570431)
# Rehearsal ------------------------------------------------
# therubyracer   0.060000   0.020000   0.080000 (  0.064798)
# --------------------------------------- total: 0.080000sec
# 
#                    user     system      total        real
# therubyracer   0.060000   0.010000   0.070000 (  0.069190)
#