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  1. or download this
    Benchmark: timing 25 iterations of Double, Single...
        Double:  2 wallclock secs ( 1.57 usr +  0.01 sys =  1.58 CPU) @ 15
    +.82/s (n=25)
        Single:  1 wallclock secs ( 1.57 usr +  0.01 sys =  1.58 CPU) @ 15
    +.82/s (n=25)
             Rate Double Single
    Double 15.8/s     --    -0%
    Single 15.8/s     0%     --
    
  2. or download this
    Benchmark: timing 25 iterations of Double, Single...
        Double:  3 wallclock secs ( 3.13 usr +  0.14 sys =  3.27 CPU) @  7
    +.65/s (n=25)
        Single:  3 wallclock secs ( 3.18 usr +  0.06 sys =  3.24 CPU) @  7
    +.72/s (n=25)
             Rate Double Single
    Double 7.65/s     --    -1%
    Single 7.72/s     1%     --
    
  3. or download this
    #!/usr/bin/perl
    
    use Benchmark qw [ cmpthese ];
    ...
            }
    );