Transactional conflict decoupling and value prediction
Fuad Tabba, Andrew W. Hay, James R. Goodman · 2011
This paper explores data speculation for improving the performance of Hardware Transactional Memory (HTM). We attempt to reduce transactional conflicts by decoupling them from cache coherence conflicts; many HTMs do not distinguish between transactional conflicts and coherence conflicts, leading to false transactional conflicts. We also attempt to mitigate the effects of coherence conflicts by using value prediction in transactions. We show that coherence decoupling and value prediction in transactions complement each other, because they both speculate on data in ways that are infeasible in the absence of HTM support.