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file = "100k.rb" # 100k lines file # create data file, if it doesn't exist yet unless (File.exists?(file)) File.open(file, "w+") { |f| f.puts("a = 1") 100000.times { f.puts("a += 1") } f.puts("p a") } end if defined?(JRUBY_VERSION) exec("jruby.bat -X-C #{file}") else exec("ruby #{file}") end # MRI is 0.3 sec # JRuby, depending on the mode, 20 - 45 secs!!!