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    define didn't work Commented Dec 15, 2012 at 14:30
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    What's wrong with having something cached? It could speed up access to the cached data. Commented Dec 15, 2012 at 14:43
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    What problem are you trying to solve? Commented Dec 15, 2012 at 14:59
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    There are many reasons why the cache wouldn’t be cleared. If the file is in use or if the cache size is due to tmpfs or ramfs. I have blogged about different possibilities of cache here. Commented Nov 18, 2014 at 15:58
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    @ott--: simple, if you want to run high level performance tests (run version X of A against version X+1 of A to measure differences), how do you eliminate the file system cache from your testing? Because if you don't you'll skew your tests. You could by rebooting, but flushing the cache is certainly another option. Commented Oct 20, 2016 at 13:23