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    SubjectRe: forkbombing Linux distributions
    Natanael Copa napisał(a):
    > On Thu, 2005-03-31 at 01:46 +0200, Felipe Alfaro Solana wrote:
    >
    >>On Mon, 28 Mar 2005 19:28:20 +0200, Matthieu Castet
    >><mat@ensilinx1.imag.fr> wrote:
    >>
    >>>>The memory limits aren't good enough either: if you set them low
    >>>>enough that memory-forkbombs are unperilous for
    >>>>RLIMIT_NPROC*RLIMIT_DATA, it's probably too low for serious
    >>>>applications.
    >>>
    >>>yes, if you want to run application like openoffice.org you need at
    >>>least 200Mo. If you want that your system is usable, you need at least 40 process per user. So 40*200 = 8Go, and it don't think you have all this memory...
    >>>
    >>>I think per user limit could be a solution.
    >>>
    >>>attached a small fork-memory bombing.
    >>
    >>Doesn't do anything on my machine:
    >>
    >># ulimits -a
    >
    > ...
    >
    >
    >>it tops at 100 processes and eats a little CPU... although the system
    >>is under load, it's completely responsive.
    >
    >
    > 100 processes is low. I often have over 150.

    On desktop system 150 processes is low too. 250 is safe and sufficient
    value.

    > I use the patch mentioned here:
    > http://marc.theaimsgroup.com/?l=linux-kernel&m=111209980932023&w=2
    > (it set the default max_threads and RLIMIT_NPROC to half of the current
    > default)
    >
    > and my system survived.

    Hmmm....my didn't when nearly all users start forkbombing!

    I think that changing the default max_threads is not a good idea. It
    might solve many problems but forkbombing require something more universal.

    Jacek
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