OUTPUT :
Benchmark: running test, with_for, with_join for at least 2 CPU seconds...
      test:  3 wallclock secs ( 2.03 usr +  0.01 sys =  2.04 CPU) @ 642509.31/s (n=1310719)
  with_for:  1 wallclock secs ( 2.14 usr +  0.00 sys =  2.14 CPU) @ 494696.26/s (n=1058650)
 with_join:  2 wallclock secs ( 2.16 usr +  0.00 sys =  2.16 CPU) @ 935679.63/s (n=2021068)