ACCELERATING PARALLEL TRANSACTIONS USING CACHE RESIDENT TRANSACTIONS

Handling parallelism in transactions. A method includes beginning a cache resident transaction. The method further includes encountering a nested structured parallelism construct within the cache resident transaction. A determination is made as to whether the transaction would run faster serially in cache resident mode or faster parallel in software transactional memory mode for the overall transaction. In the software transactional memory mode, cache resident mode is used for one or more hierarchically lower nested transactions. The method further includes continuing the transaction in the mode determined.