AMBITION: Ambient Temperature Aware VM Allocation for Edge Data Centers.

Edge data centers are increasingly deployed to improve response time of intelligent services. Due to the high computing demands for such services, edge data centers consume a considerable amount of power, generating excessive heat. To mitigate thermal problems with a smaller cooling power, edge data centers usually trigger software-based thermal management techniques along with the air cooling systems. Unfortunately, the ambient temperature of servers often has a surge due to the consolidation of VMs and heat propagation among components (e.g., CPU, GPU, memory unit, disk, etc.). Higher ambient temperature further increases the on-chip temperature, invoking more frequent thermal throttling. To resolve thermal problems deteriorated by the ambient temperature, in this paper, we propose an ambient temperature aware VM allocation technique, called AMBITION. Considering the performance impact of ambient temperature, AMBITION estimates the actual computing capacity of servers. Based on the computing demands of VMs, AMBITION finds an appropriate server which has sufficient ambient-aware computing capacity to run the VM; it allocates computation-intensive VMs to the servers with the higher ambient-aware computing capacity, and distributes memory-intensive VMs to the individual servers as much as possible. In our experiments on an edge data center, AMBITION shows the execution time speedup of 50.3%, on average (up to 73.8%), compared to a conventional VM allocation technique while saving system-wide energy by 5.9% (up to 13.6%). At the expense of 5.8% speedup (from 50.3% to 44.5%), AMBITION further saves cooling power by 84.3%, leading to 29.3% of total edge data center energy saving.