Ting Coa, Tiejin Gao, Stephen M. Blackburn, and Kathryn S. McKinely
We identify a synergy between AMP and VM services that we exploit to attack the 40% average energy overhead due to VM services. Using measurements and very conservative models, we show that adding small cores tailored for VM services should deliver, at least, improvements in performance of 13%, energy of 7%, and performance per energy of 22%. The yin of VM services is overhead, but it meets the yang of small cores on an AMP. The yin of AMP is exposed hardware complexity, but it meets the yang of abstraction in managed languages. VM services fulfill the AMP requirement for an asynchronous, non-critical, differentiated, parallel, and ubiquitous workload to deliver energy efficiency. Generalizing this approach beyond system software to applications will require substantially more software and hardware investment, but these results show the potential energy efficiency gains are significant.
|Published in||ACM/IEEE International Symposium on Computer Architecture|