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To prime the cache with a whole file: cat big.file >/dev/null To prime the cache with a portion of a file, as per this comment: time dd if=big.file of=/dev/null bs=1024k count=XXX skip=YYY Example 2.5G file: $ time rarara big.file 0 2459650481 real 0m13.803s $ sync && echo 3 | sudo tee /proc/sys/vm/drop_caches $ time dd if=big.file ...

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