lkml.org 
[lkml]   [2005]   [Mar]   [31]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: forkbombing Linux distributions
From
Date
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.

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.

ncopa@nc ~ $ ulimit -u
4093

(I have 1 GiB RAM)

--
Natanael Copa


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-04-06 13:31    [W:0.073 / U:0.184 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site