Hi again, this is a follow-up on my last SGE question (Subject: SGE and checkpointing). I did some naive web search, and I think the feature we want is termed "preemption." Is that correct? http://www.supercluster.org/documentation/maui/8.4preemption.html Maui is a scheduler that has that preemption feature, and I read that SGE can be combined with Maui. Is that correct? http://www.supercluster.org/documentation/maui/sgeintegration.html Of course, if SGE (without Maui) could do preemption, that would be great. Can it do that? How? Best regards, Ivo +++ From: Ivo Grosse <email@example.com> Organization: Cold Spring Harbor Laboratory To: firstname.lastname@example.org Subject: [Bioclusters] SGE and checkpointing Hi, - does SGE support checkpointing? How? - if yes, is SGE capable of suspending low-priority jobs temporarily, when there are high priority jobs waiting in the queue? Ivo P.S. I mean: in the standard implementation of SGE that we currently use, SGE is able to rearrange the jobs in the queue by priority. That is, if you submit a low-priority job first, and I submit a high-priority second, and your job has not yet started, then my job will be executed first. However, if your job has already started, then (in the implementation of SGE that we currently use) my job will have to wait till your job is done. Can this be changed? We would like to have the following solution: User X submits 80 low-priority jobs, and each of them will run for 2 weeks. Since the queue is currently empty, all of the jobs get started. Now user Y wants to submit just one high-priority job, which will run for only 1 day. Unfortunately, in the current implementation of SGE, the job of user Y would have to wait for 2 weeks. What we would like is that one of the low-priority jobs of X gets temporarily suspended, the high-priority job of user Y gets started, and after the job of Y is finished, the suspended job of user X is continued. Is that possible? How?