file size: 134217728, block size: 8192, blocks: 16384
writing file...
file written
cleaning disk cache
disk cache clean
timing preload and random seek
timethis 1:  6 wallclock secs ( 1.34 usr +  0.36 sys =  1.70 CPU) @  0.59/s (n=1)
timing random seek with preloaded disk cache
timethis 1:  1 wallclock secs ( 0.88 usr +  0.06 sys =  0.94 CPU) @  1.06/s (n=1)
cleaning disk cache
disk cache clean
timing random seek with empty disk cache
timethis 1: 93 wallclock secs ( 1.29 usr +  1.15 sys =  2.44 CPU) @  0.41/s (n=1)