Hi Simon, On Tue, Dec 22, 2009 at 5:31 AM, Simon King <simon.k...@nuigalway.ie> wrote: > Hi! > > I currently have a process running on sage.math that from time to time > writes data to disk. I noticed that quite often the process does not > appear in top, then shortly flashes up, and disappears again. My > interpretation is that it is invisible to top when data are written. > But this interruption takes an unusual amount of time. > > So, is there a problem with the disks or the NFS? > > There were also some problems when I connected with ssh: Sometimes > after typing the password, nothing happened for several minutes, or > the message of the day appeared, but no prompt came, or I typed > "screen -r" but nothing happened for quite some time. > > Do other people experience the same?
Yes. It has been happening since the last 24 hours. > Are these things possibly > related? When something like this happens, it is likely the problem is related to NFS, especially disk I/O on an NFS mounted disk. To minimize disruption, one should use the directory /scratch on sage.math. For more guidelines on minimizing disruption on the Sage cluster, see the guidelines [1] on the Sage wiki. [1] http://wiki.sagemath.org/SageClusterGuidelines -- Regards Minh Van Nguyen -- 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
