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bash-3.00$ jruby --server bench/bench_fib_recursive.rb 10
  3.059000   0.000000   3.059000 (  3.059312)
  2.056000   0.000000   2.056000 (  2.055544)
  2.055000   0.000000   2.055000 (  2.055455)
  2.055000   0.000000   2.055000 (  2.055505)
  2.055000   0.000000   2.055000 (  2.055515)
  2.094000   0.000000   2.094000 (  2.094173)
bash-3.00$ /opt/coolstack/bin/ruby bench/bench_fib_recursive.rb 
 24.900000   4.830000  29.730000 ( 29.740846)
^Cbench/bench_fib_recursive.rb:7:in `fib_ruby': Interrupt
        from bench/bench_fib_recursive.rb:7:in `fib_ruby'
        from bench/bench_fib_recursive.rb:7:in `fib_ruby'
        from bench/bench_fib_recursive.rb:7:in `fib_ruby'