Hello everybody !!! There has been a bug report [1, 2] on "ask Sage" about a memory leak with CPLEX. I checked, and it is True. But I do not think I know how to patch that.
Here is the thing : the dominating_set function (among many others) uses Linear Programming, and so creates a LP object when it is called. The LP object *should* disappear by itself when the method returns its result, but I observed a STRANGE behaviour... sage: graphs.PetersenGraph().dominating_set() IBM ILOG License Manager: "IBM ILOG Optimization Suite for Academic Initiative" is accessing CPLEX 12 with option(s): "e m b q ". [1, 4, 5] sage: graphs.PetersenGraph().dominating_set() [1, 4, 5] sage: graphs.PetersenGraph().dominating_set() [1, 4, 5] sage: graphs.PetersenGraph().dominating_set() [1, 4, 5] sage: graphs.PetersenGraph().dominating_set() [1, 4, 5] sage: graphs.PetersenGraph().dominating_set() [1, 4, 5] sage: graphs.PetersenGraph().dominating_set() [1, 4, 5] sage: # At this moment I just *do nothing* for a few seconds..... sage: graphs.PetersenGraph().dominating_set() __dealloc__ called ! __dealloc__ called ! __dealloc__ called ! __dealloc__ called ! __dealloc__ called ! __dealloc__ called ! __dealloc__ called ! [1, 4, 5] sage: graphs.PetersenGraph().dominating_set() [1, 4, 5] sage: graphs.PetersenGraph().dominating_set() [1, 4, 5] sage: graphs.PetersenGraph().dominating_set() [1, 4, 5] sage: graphs.PetersenGraph().dominating_set() [1, 4, 5] sage: graphs.PetersenGraph().dominating_set() [1, 4, 5] sage: graphs.PetersenGraph().dominating_set() [1, 4, 5] sage: graphs.PetersenGraph().dominating_set() [1, 4, 5] sage: exit Exiting Sage (CPU time 0m0.27s, Wall time 0m13.47s). __dealloc__ called ! __dealloc__ called ! __dealloc__ called ! __dealloc__ called ! __dealloc__ called ! __dealloc__ called ! __dealloc__ called ! __dealloc__ called ! Well. With this kind of behaviour, no wonder a loops ends up eating a lot of memory, but then I do not know what to do anymore... Should I call "del" explicitely at the end of each function ? Thank you for your help O_o;;; Nathann [1] http://ask.sagemath.org/question/1170/memory-blowup-with-milp [2] http://ask.sagemath.org/question/1191/memory-blowup-2 -- 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
