Memory Hotplug for Energy Savings of HPC systems
Authors: Shinobu Miwa (University of Electro-Communications), Hiroki Honda (University of Electro-Communications)
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Abstract: Modern supercomputer centers are needed for the energy savings because of reducing the running costs. For increased energy savings, reducing the standby power of hardware devices is indispensable because many devices in an HPC system are unused for long periods. Although many techniques like per-core power gating have succeeded in reduction of CPU standby power, power savings of memories are still modest regardless of its considerable amount of standby power. To bridge this gap, we propose exploiting memory hotplug for power savings of memories within HPC systems. Memory hotplug, which is supported by Linux kernel 3.9 or later, is to plug and pull DIMMs in a running computer system. With this state-of-the-art technology, this paper proposes a technique to control memory size called on-demand memory hot-add. Our experiment with HPCC benchmarks demonstrates that the proposed technique allows a server node to turn off many slices of memories.
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