results_odirect_ra256
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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: 256 4kb blocks read: Success real 0m38.252s user 0m0.045s sys 0m12.866s 8kb blocks read: Success real 0m22.145s user 0m0.021s sys 0m8.383s 16kb blocks read: Success real 0m14.221s user 0m0.012s sys 0m5.489s 32kb blocks read: Success real 0m10.835s user 0m0.004s sys 0m4.500s 64kb blocks read: Success real 0m9.752s user 0m0.003s sys 0m3.658s 128kb blocks read: Success real 0m9.980s user 0m0.000s sys 0m3.513s 256kb blocks read: Success real 0m9.872s user 0m0.001s sys 0m3.245s 512kb blocks read: Success real 0m9.814s user 0m0.000s sys 0m3.173s 1024kb blocks read: Success real 0m9.880s user 0m0.001s sys 0m3.170s 2048kb blocks read: Success real 0m11.961s user 0m0.000s sys 0m3.380s 4096kb blocks read: Success real 0m11.374s user 0m0.002s sys 0m3.348s 8192kb blocks read: Success real 0m11.970s user 0m0.000s sys 0m3.312s