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In systems consisting of multiple clusters of processors which employ space sharing for scheduling jobs, such as our Distributed ASCI 1 Supercomputer (DAS), coallocation, i.e., the simultaneous allocation of processors to single jobs in multiple clusters, may be required. In studies of scheduling in single clusters it has been shown that the achievable (maximal) utilization may be much less than 100%, a problem that may be aggravated in multicluster systems. In this paper we study the maximaldoi:10.1109/ipdps.2003.1213154 dblp:conf/ipps/BucurE03 fatcat:vqtha5j4azcm5eorqxsyfcoj6a