Energy reduction in multiprocessor systems using transactional memory

ABSTRACT

The emphasis in microprocessor design has shifted from high performance, to a combination of high performance and low power. Until recently, this trend was mostly true for uniprocessors. In this work we focus on new energy consumption issues unique to multiprocessor systems: synchronization of accesses to shared memory. We investigate and compare different means of providing atomic access to shared memory, including locks and lock-free synchronization (i.e., transactional memory), with respect to energy as well as performance. We show that transactional memory has an advantage in terms of energy consumption over locks, but that this advantage largely depends on the system architecture, the contention level, and the policy of conflict resolution

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INDEX TERMS

Primary Classification:
  C. Computer Systems Organization
  C.1 PROCESSOR ARCHITECTURES
      C.1.2 Multiple Data Stream Architectures (Multiprocessors)

General Terms:
Design

Keywords:
multiprocessor, power, transactional memory