On 10 March 2010 18:07, William Stein <wst...@gmail.com> wrote: > 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
Thanks for the tip - I have just done that. Fingers crossed... John > > -- > William Stein > Associate Professor of Mathematics > University of Washington > http://wstein.org > > -- > To post to this group, send an email to sage-devel@googlegroups.com > To unsubscribe from this group, send an email to > sage-devel+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/sage-devel > URL: http://www.sagemath.org > -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
