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    SubjectRe: SMP scalability: 8 -> 32 CPUs
    Larry McVoy writes:
    > It's a basic truth that the more scaling you want, the more locks you'll
    > need. Very, very quickly this will become an unmanagable problem - the
    > kernel becomes a forest of locks - for example, there were thousands
    > of locks in the Solaris kernel when I left Sun almost 5 years ago.

    As a corroborating data-point, I count about 1400 locks listed
    in /usr/sys/kern/lockinfo.c for Digital UNIX 4.0D.


    Malcolm Beattie <>
    Unix Systems Programmer
    Oxford University Computing Services

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