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SubjectRe: File System Performance
In article <>,
Andrew Morton <> wrote:
>It's tar. It cheats. It somehow detects that the
>output is /dev/null, and so it doesn't read the input files.

Probably the kernel.

If you do a mmap()+write(), the write() to /dev/null won't even read the
mmap contents, which in turn will cause the pages to never be brought

Anything which uses mmap+write will show this.

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