Re: clearing filesystem cache for I/O benchmarks

[Andrew Morton]

Benjamin Rutt <rutt.4+news@xxxxxxx> wrote:
>
>  How can I purge all of the kernel's filesystem caches, so I can trust
>  that my I/O (read) requests I'm trying to benchmark bypass the kernel
>  filesystem cache?

Either delete the benchmark test files or, in 2.6, use
fsync+posix_fadvise(POSIX_FADV_DONTNEED);
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