Ultra-Low Latency SSDs' Impact on Overall Energy Efficiency

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Empirical study measures an Intel Optane SSD alongside an HDD and two flash SSDs on a 1U Dell using an inline plug power meter and fio workloads and shows Optane eats more peak power yet yields the best energy proportionality spanning >50% of peak system power and the highest bytes-per-joule and IOPS-per-joule. Tiny 1 KB requests are highly inefficient, Optane saturates with limited internal parallelism so deeper queues stop improving efficiency, and interrupts spike to ~600,000 interrupts/sec and drive ~300% CPU at ~400,000 interrupts for writes.

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1. 0:00UNIVERSITY OF LOUISVILLE
2. 0:30What is Ultra-Low Latency (ULL) data access?
3. 0:55What is Optane SSD?
4. 1:16Motivation
5. 2:12Test devices
6. 2:37Experimental setup
7. 3:20Idle vs. active power consumption
8. 5:06Read vs. write power consumption Observation 3 Newer storage generations have greater differences in power consumption between reads and writes
9. 5:55Energy proportionality
10. 7:33Impact on system software
11. 9:30Overall energy efficiency metrics
12. 9:55Impact on overall energy efficiency Observation 6
13. 11:27Conclusion
14. 11:52Discussion and future research