results_odirect_ra4096
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[craig@ayaki tmp]$ echo -n "Readahead: "; sudo blockdev --getra /dev/sda; for (( x = 2; x < 14; x++ )); do echo $((1<<x))kb blocks; time ./io $((1<<x)) test_file; done Readahead: 4096 4kb blocks read: Success real 0m37.465s user 0m0.037s sys 0m12.810s 8kb blocks read: Success real 0m21.776s user 0m0.024s sys 0m8.362s 16kb blocks read: Success real 0m14.085s user 0m0.012s sys 0m5.463s 32kb blocks read: Success real 0m10.661s user 0m0.006s sys 0m4.496s 64kb blocks read: Success real 0m9.778s user 0m0.005s sys 0m3.768s 128kb blocks read: Success real 0m9.730s user 0m0.000s sys 0m3.373s 256kb blocks read: Success real 0m10.371s user 0m0.000s sys 0m3.140s 512kb blocks read: Success real 0m9.847s user 0m0.000s sys 0m3.169s 1024kb blocks read: Success real 0m9.880s user 0m0.000s sys 0m3.098s 2048kb blocks read: Success real 0m11.124s user 0m0.000s sys 0m3.001s 4096kb blocks read: Success real 0m11.653s user 0m0.000s sys 0m2.765s 8192kb blocks read: Success real 0m11.503s user 0m0.001s sys 0m2.680s