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We present RackSched, the first rack-level microsecond-scale scheduler that provides the abstraction of a rack-scale computer (i.e., a huge server with hundreds to thousands of cores) to an external service ... The core of RackSched is a two-layer scheduling framework that integrates inter-server scheduling in the top-of-rack (ToR) switch with intra-server scheduling in each server. ... Acknowledgments We thank our shepherd Ryan Stutsman and the anonymous reviewers for their valuable feedback. We thank Jack Humphries for helping debug Shinjuku issues. ...arXiv:2010.05969v2 fatcat:7lzwuq35ivcipia7dlzwo673eq