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    SubjectRe: [PATCH] O_STREAMING - flag for optimal streaming I/O
    On Tue, 8 Oct 2002, Andrew Morton wrote:

    > I'd say that if you were designing a new application which
    > streams large amount of data then yes, you would design it
    > to use O_DIRECT. You would instantiate a separate IO worker
    > thread and a message passing mechanism so that thread would
    > pump your data for you, and would peform your readahead, etc.
    >
    > If your filesystem supports O_DIRECT, of course. Not all do.
    >
    > The strength of O_STREAMING is that you can take an existing,
    > working, megahuge application and make it play better with the
    > VM by changing a single line of code. No big redesign needed.

    Such as perl:

    sysopen(MYKERNEL, "/boot/vmlinuz", 04000000);

    O_DIRECT support is another beast, IMHO.

    .TM.

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