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    SubjectRe: Overcommitable memory??
    Horst von Brand <vonbrand@pincoya.inf.utfsm.cl>:
    > David Whysong <dwhysong@physics.ucsb.edu> said:
    >
    > [...]
    >
    > > Preventing system OOM using resource limits is equivalent to disabling
    > > overcommit. You have to restrict each of N users to 1/N of the total
    > > system memory.
    >
    > So you have 500 accounts, each one gets to use 1/500th of the (be very
    > generous!) 2Gb VM. What if a batch of 50 new accounts shows up? Everybody
    > gets the quota cut down 10%?

    I believe the "N" referrs to N concurrent users.

    > There are usually 10 active accounts, each one gets 200Mb. What if the 11th
    > logs in? Start killing off processes of the people that were using exactly
    > their share of the memory ATM?

    The 11th gets an "insufficient resourcess currently available for login"
    message.

    > Resource limits per user are orthogonal to overcommit. You could very well
    > limit Jane Random User to 300Mb, as long as the system is able to provide
    > it. You can overcommit or not, but in no case can Jane use more than her
    > limit.

    -------------------------------------------------------------------------
    Jesse I Pollard, II
    Email: pollard@navo.hpc.mil

    Any opinions expressed are solely my own.

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