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    SubjectRe: mmap vs. O_DIRECT
    On Mer, 2004-11-10 at 00:05, Bill Davidsen wrote:
    > I have an application which does a lot of mmap to process its data. The
    > huge waitio time makes me think that mmap isn't doing direct i/o even
    > when things are alligned.

    Make sure you are using MAP_SHARED in such cases so that the object you
    have is the page cache object, also remember to use madvise

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