On Tue, Aug 2, 2011 at 9:51 AM, VictorMiller <[email protected]> wrote: > Yesterday I started up sage 4.6.2 on one of our compute servers, > started the notebook interface, and connected to from firefox on my > workstation. I started up a notebook session, where I constructed a > particular elliptic curve over GF(2^351), and a point on it. I > (unwisely) tried > > P1.order() > > When it didn't come back after 30 seconds or so, I realized that I was > implicitly asking Sage to compute the order of the curve and then > factor that order, so I tried to kill it by using Interrupt, which > didn't work, so I restarted the worksheet. However, at that point > things became non-responsive. I eventually ended up logging onto the > server and stopping sage. About an hour later the computer > administrator came into my office saying that I had nearly brought the > compute server to its knees because I had started 1300 processes (all > running something in the sage directory)! Has anybody seen anything > like this before?
I have definitely never heard of or seen anything like this before. Is it something you can reproduce? -- You don't say above... This of course sounds like a "fork bomb". Note that many computer systems are configured by default to not allow a single user to create that many processes, in order to avoid fork bombs. You can use ulimit to set a process limit on a per-session basis, if you want to test this issue again on your computer without the possibility of actually nearly bringing the computer to its knees. -- William > > Victor > > -- > To post to this group, send email to [email protected] > To unsubscribe from this group, send email to > [email protected] > For more options, visit this group at > http://groups.google.com/group/sage-support > URL: http://www.sagemath.org > -- William Stein Professor of Mathematics University of Washington http://wstein.org -- To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
