NuPow: Managing Power on NUMA Multiprocessors with Domain-Level Voltage and Frequency Control
Power management and task placement pose two of the greatest challenges for future many-core processors in data centers. With hundreds of cores on a single die, cores experience varying memory latencies and cannot individually regulate voltage and frequency, therefore calling for new approaches to scheduling and power management. This work presents NuPow, a hierarchical scheduling and power management framework for architectures with multiple cores per voltage and frequency domain and non-uniform memory access (NUMA) properties. NuPow considers the conflicting goals of grouping virtual machines (VMs) with similar load patterns while also placing them as close as possible to the accessed data. Implemented and evaluated on existing hardware, NuPow achieves significantly better performance per watt compared to competing approaches.