Tom Lane wrote:
easy or cheap to get a measurement that isn't skewed by kernel caching
behavior.  (You need a test file significantly larger than RAM, and
even then you'd better repeat the measurement quite a few times to see
how much noise there is in it.)

I found a really fast way in Linux to flush the kernel cache and that is to unmount the drive and then remount. Beats having to read though a file > RAM everytime.

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