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    SubjectRe: process creation time increases linearly with shmem
    Nick Piggin wrote:
    > fork() can be changed so as not to set up page tables for
    > MAP_SHARED mappings. I think that has other tradeoffs like
    > initially causing several unavoidable faults reading
    > libraries and program text.
    >
    > What kind of application are you using?

    The application is a database system called Caché. We allocate a large
    shared memory segment for database cache, which in a large production
    environment may realistically be 1+GB on 32-bit platforms and much
    larger on 64-bit. At these sizes fork() is taking hundreds of
    miliseconds, which can become a noticeable bottleneck for us. This
    performance characteristic seems to be unique to Linux vs other Unix
    implementations.

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