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I am well aware on how to drop (e.g. /sbin/sysctl vm.drop_caches=3 ) caches in Linux, but for benchmarking I'd like to do the reverse, fill up the caches up to 100% RAM if possible. How would I do that pragmatically?

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Try just reading all the bits in the file system until cache usage seems to high water-mark: find / -type f -exec md5sum {} \; –  MadHatter Aug 29 '13 at 10:11
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-exec cat {} >>/dev/null would use less CPU –  symcbean Aug 29 '13 at 10:17
    
Grumble. Not only are you a CPU cheapskate, you're right, as well. –  MadHatter Aug 29 '13 at 10:29
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Why are you commenting instead of clicking answer button to give a proper answer I can mark up as the right one? =) –  Dima Aug 29 '13 at 11:49

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