There are recurring inquiries why jobs "stopped working all of a sudden". In most cases, SGE killed them because they exceeded their requested memory limit.
It would probably be nice to send a mail à la:
Your job #4711 was aborted because it exceeded its requested memory limit of x MByte. If you want to increase the memory requested, please see https://wikitech.wikimedia.org/wiki/Help:Tool_Labs#something_helpful. If you have questions, please see https://wikitech.wikimedia.org/wiki/Help:Tool_Labs#something_about_irc_channels_and_stuff.
to the job owner when a job is aborted due to memory exhaustion.