how to turn off, or to clear read cache?

[Sergey Spiridonov]

Hi,

I need to make some performance tests. I need to switch off or to clear 
read cache, so that consequent reading of the same file will take the 
same amount of time.

Is there an easy way to do it, without rebuilding the kernel?

Please, put me on CC since I'm not subscriber of linux-kernel
--
Best regards, Sergey Spiridonov

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