D2STM: Dependable Distributed Software Transactional Memory

M. Couceiro, P. Romano, N. Carvalho, L. Rodrigues.

Selected sections of this report were published in the Proceedings of the 15th Pacific Rim International Symposium on Dependable Computing (PRDC 09), Shanghai, China, November 16-18, 2009.


Software Transactional Memory (STM) systems have emerged as a powerful paradigm to develop concurrent applications. At current date, however, the problem of how to build distributed and replicated STMs to enhance both dependability and performance is still largely unexplored. This paper fills this gap by presenting D2STM, a replicated STM that makes use of the computing resources available at multiple nodes of a distributed system. The consistency of the replicated STM is ensured in a transparent manner, even in the presence of failures. In D2STM transactions are autonomously processed on each node, avoiding any replica inter-communication during transaction execution, and without incurring in deadlocks. Strong consistency is enforced at transaction commit time by a non-blocking distributed certification scheme, which we name BFC (Bloom Filter Certification). BFC exploits a novel Bloom Filter-based encoding mechanism that permits to significantly reduce the overheads of replica coordination at the cost of a user tunable increase in the probability of transaction abort. Through an extensive experimental study based on standard STM benchmarks we show that the BFC scheme permits to achieve remarkable performance gains even for negligible (e.g. 1%) increases of the transaction abort rate.

Also available extended report (pdf)

Luís Rodrigues