Implementing and Evaluating Nested Parallel Transactions in Software Transactional Memory

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Executive Summary

Transactional Memory (TM) is a promising technique that simplifies parallel programming for shared-memory applications. To date, most TM systems have been designed to efficiently support single-level parallelism. To achieve widespread use and maximize performance gains, TM must support nested parallelism available in many applications and supported by several programming models. The authors present NesTM, a Software TM (STM) system that supports closed-nested parallel transactions. NesTM is based on a high-performance, blocking STM that uses eager version management and word-granularity conflict detection.

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