In my University, most math labs are done using Sagemath; for this purpose we have two PC's with sagenb service to which students access remotely. In general, it works smoothly; three classrooms with 20 students each, and people working at home simultaneously does not saturate the servers. Sometimes, students program some infinite loops or try heavy computations. The notebook is launched with ulimits but they do not seem to work, and 30GB process (resident memory) arise, and they usually hang the notebook; killing the process is not enough, one must restart the notebook. We have tried some limitations of memlock and cpu time in /etc/security/limits.conf but it seems they are too strict; I am not sure if it is the reason, but an open worksheet seems to use CPU time even with no computation and then the notebook becomes completely inaccessible. Which is the good strategy to avoid this? The systems run Ubuntu 16.04 and Sagemath 7.3 Thanks, Enrique Artal.
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