> perl index.pl
Benchmark: timing 1000 iterations of slurp, sys, sysby128, sysby256, sysby512...
     slurp: 12 wallclock secs ( 4.29 usr +  5.43 sys =  9.72 CPU) @ 102.88/s (n=1000)
       sys:  8 wallclock secs ( 0.10 usr +  6.88 sys =  6.98 CPU) @ 143.27/s (n=1000)
  sysby128:  9 wallclock secs ( 0.21 usr +  6.98 sys =  7.19 CPU) @ 139.08/s (n=1000)
  sysby256:  8 wallclock secs ( 0.25 usr +  6.74 sys =  6.99 CPU) @ 143.06/s (n=1000)
  sysby512:  9 wallclock secs ( 0.15 usr +  6.70 sys =  6.85 CPU) @ 145.99/s (n=1000)
          Rate    slurp sysby128 sysby256      sys sysby512
slurp    103/s       --     -26%     -28%     -28%     -30%
sysby128 139/s      35%       --      -3%      -3%      -5%
sysby256 143/s      39%       3%       --      -0%      -2%
sys      143/s      39%       3%       0%       --      -2%
sysby512 146/s      42%       5%       2%       2%       --