CSE 591: Energy-Efficient Computing Lecture 21 review

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CSE 591: Energy-Efficient Computing Lecture 21 review Anshul Gandhi 347, CS building anshul@cs.stonybrook.edu

Lenovo: Laptop-level PM

VMware

Host Power Management C-states to lower idle power P-states to lower active power (+TurboBoost)

Host Power Management

Distributed Resource Scheduler Giving options vs default. Migrate VMs for priority and to maintain minimum resource requirements

Distributed Resource Scheduler Make more room on congested server or move to less congested server – for priority VMs.

Distributed Power Management Migrate VMs for host power savings Requires WOL ! Different from HPM (local vs. distributed)

Distributed Power Management Autoscaling.

HPM vs. DPM 400VMs @ 8 hosts. 30min idle, 30min load, 30min idle

AutoScaling

AWS

Google Cloud Platform Maintain given utilization level by automatically determining how many VMs to add/remove.

Google: Data center-level PM

Best practices Thermostat Airflow Outside air Don’t turn off servers – use them somehow.

Natural cooling Location Cooling Companies Hamina, Finland Seawater Google Dublin, Ireland Outside air Amazon, MS, Google Lulea, Sweden Outside air + server exhaust + hydro-electricity FB Rjukan, Norway Outside air +hydro-electricity Telemark Reykjavik, Iceland Verne Global

power_provisioning paper (Google)

Power breakdown

Average vs. Peak vs. Max

Power capping – extra deployment

DVFS Simulation results Latency? Rarely fully idle, so can’t use sleep, etc. Have to reduce idle power. DVFS not that useful for single machine, but useful to increase density if there are many variably loaded machines. Simulation results Latency?