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- W2511893312 abstract "Traditional transactional memory systems suffer from overly conservative conflict detection, yielding so-called false conflicts, because they are based on fine-grained, low-level read/write conflicts. In response, the recent trend has been toward integrating various abstract data-type libraries using adhoc methods of high-level conflict detection. These proposals have led to improved performance but a lack of a unified theory has led to confusion in the literature. We clarify these recent proposals by defining a generalization of transactional memory in which a transaction consists of coarse-grained (abstract data-type) operations rather than simple memory read/write operations. We provide semantics for both pessimistic (e.g. transactional boosting) and optimistic (e.g. traditional TMs and recent alternatives) execution. We show that both are included in the standard atomic semantics, yet find that the choice imposes different requirements on the coarse-grained operations: pessimistic requires operations be left-movers, optimistic requires right-movers. Finally, we discuss how the semantics applies to numerous TM implementation details discussed widely in the literature. University of Cambridge Microsoft Research Cambridge Brown University" @default.
- W2511893312 created "2016-09-16" @default.
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- W2511893312 date "2011-01-01" @default.
- W2511893312 modified "2023-10-17" @default.
- W2511893312 title "Coarse-grained transactions (extended version)" @default.
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