Benchmark: timing 10 iterations of berkeley write, file write...
berkeley write:  7 wallclock secs ( 4.01 usr +  3.24 sys =  7.25 CPU) @  1.38/s (n=10)
file write: 15 wallclock secs ( 3.00 usr + 10.51 sys = 13.51 CPU) @  0.74/s (n=10)
               s/iter     file write berkeley write
file write       1.35             --           -46%
berkeley write  0.725            86%             --
Benchmark: timing 10 iterations of berkeley read, file read...
berkeley read:  2 wallclock secs ( 1.07 usr +  1.21 sys =  2.28 CPU) @  4.39/s (n=10)
 file read:  1 wallclock secs ( 0.50 usr +  0.61 sys =  1.11 CPU) @  9.01/s (n=10)
                Rate berkeley read     file read
berkeley read 4.39/s            --          -51%
file read     9.01/s          105%            --