University of Otago Technical Report OUCS - 2010 - 04 View - Oriented Transactional Memory

—This paper proposes a View-Oriented Transac-tional Memory (VOTM) model to seamlessly integrate different concurrency control methods including locking mechanism and transactional memory. The model allows programmers to partition the shared memory into " views " which are non-overlapping sets of shared data objects. A Restricted Admission Control (RAC) scheme is proposed to control the number of processes accessing each view in order to reduce the number of aborts of transactions. The RAC scheme has the merits of both the locking mechanism and the transactional memory. Experimental results demonstrate that VOTM outperforms traditional transactional memory models such as TinySTM by up to five times. Also VOTM outperforms pure lock-based models in applications with long critical sections and has comparable performance with lock-based models in other cases.