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A premier goal of resource allocators in virtualization environments is to control the relative resource consumption of the different virtual machines, and moreover, to be able to change the relative allocations at will. However, it is not clear what it means to provide a certain fraction of the machine when multiple resources are involved. The authors suggest that a promising interpretation is to identify the system bottleneck at each instant, and to enforce the desired allocation on that device. This in turn induces an efficient allocation of the other devices.
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