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ε-STM is the first software transactional memory supporting elastic transactions. Elastic transactions are a variant of the transactional model. Upon conflict detection, an elastic transaction might drop what it did so far within a separate transaction that immediately commits, and initiate a new transaction which might itself be elastic.
Elastic transactions are a complementary alternative to traditional transactions, particularly appealing when implementing search structures. Both forms of transactions can safely be combined within the same application. ε-STM implementation is faster than a state-of-the-art software transactional memory in various workloads and with a speedup of 36% on average. It also presents a speedup over lock-based solutions of 89% on average.
The figure on the right-hand side shows that ε-STM multiplies regular STM peak performance by a factor of 4 on an 8-core machine for searching and modifying a 216-sized linked list, but, more importantly, tolerates contention. Indeed it scales better as the ratio of updating transactions grows and the level of parallelism grows.Here is the simple API, ε-STM provides to the user:
For further information please contact Vincent.Gramoli@epfl.ch.