Cray Fair Share Scheduler at AT&T Bell Laboratories

AT&T Bell Laboratories has modified Cray's Unicos operating system to incorporate a hierarchical Fair Share Scheduler that allows us to assign logical portions of the machine to different sets of users. This talk will briefly describe the Share software that served as the basis for this scheduler and then discuss the changes that we made to it for the Cray environment. We will also review our experience to date with this system. Our code served as a model for the Fair Share Scheduler that is to be included in Unicos Release 5.0.