On Wed, Mar 10, 2010 at 9:38 AM, John Cremona <john.crem...@gmail.com> wrote:
> I am taking the liberty of forwarding this to sage-devel since it
> seems much too important for just sage-nt. OK, so that was my machine
> David locked up (apparently!). It has 128GB of RAM so does not easily
> run out...
>
> John
It is easy to change your linux install so that normal users *can't*
crash/hang the machine by using too much RAM. I do that on the
sage.math cluster. You probably have kernel virtual memory
overcommit set to "on" with your machines, and this is a bad idea,
since it means any users can trivially crash them (or at least make
them totally nonresponsive).
This article describes virtual memory overcommit:
http://lwn.net/Articles/104179/
At the end of the charming article, it says to turn it off all you
have to do is put these lines at the end of /etc/sysctl.conf":
# Get rid of OOM. See http://lwn.net/Articles/104179/
vm.overcommit_memory=2
Do this to make the effect immediate (without rebooting):
wst...@boxen:~$ sudo sysctl vm/overcommit_memory=2
vm.overcommit_memory = 2
--
William Stein
Associate Professor of Mathematics
University of Washington
http://wstein.org
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