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Proportional share resource management provides a flexible and useful abstraction for multiplexing time-shared resources. However, previous proportional share mechanisms have either weak proportional sharing accuracy or high scheduling overhead. We present Group Ratio Round-Robin (GR3), a proportional share scheduler that can provide high proportional sharing accuracy with O(1) scheduling overhead. Unlike many other schedulers, a low-overhead GR3 implementation is easy to build using simpledoi:10.7916/d85b09cp fatcat:vezz7bma45cmhnkgtgcyanokni