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  1. Proceedings of the 2006 workshop on Memory system performance and correctness (MSPC '06)
  2. Memory models for open-nested transactions
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Deconstructing process isolation
Efficient pattern mining on shared memory systems: implications for chip multiprocessor architectures
Keynote talk challenges in chip multiprocessor memory systems
What do high-level memory models mean for transactions?
A flexible data to L2 cache mapping approach for future multicore processors
Reliability-aware data placement for partial memory protection in embedded processors
Seven at one stroke: results from a cache-oblivious paradigm for scalable matrix algorithms
Memory models for open-nested transactions
A comprehensive study of hardware/software approaches to improve TLB performance for java applications on embedded systems
Smarter garbage collection with simplifiers
Implicit and explicit optimizations for stencil computations
Atomicity via source-to-source translation

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Memory models for open-nested transactions

Content Provider ACM Digital Library
Author Leiserson, Charles E. Agrawal, Kunal Sukha, Jim
Abstract Open nesting provides a loophole in the strict model of atomic transactions. Moss and Hosking suggested adapting open nesting for transactional memory, and Moss and a group at Stanford have proposed hardware schemes to support open nesting. Since these researchers have described their schemes using only operational definitions, however, the semantics of these systems have not been specified in an implementation-independent way. This paper offers a framework for defining and exploring the memory semantics of open nesting in a transactionl-memory setting.Our framework allows us to define the traditional model of serializability and two new transactional-memory models, race freedom and prefix race freedom. The weakest of these memory models, prefix race freedom, closely resembles the Stanford openesting model. We prove that these three memory models are equivalent for transactional-memory systems that support only closed nesting, as long as aborted transactions are "ignored." We prove that for systems that support open nesting, however, the models of serializability, race freedom, and prefix race freedom are distinct. We show that the Stanford TM system implements a model at least as strong as prefix race freedom and strictly weaker than race freedom. Thus, their model compromises serializability, the property traditionally used to reason about the correctness of transactions.
Starting Page 70
Ending Page 81
Page Count 12
File Format PDF
ISBN 1595935789
DOI 10.1145/1178597.1178610
Language English
Publisher Association for Computing Machinery (ACM)
Publisher Date 2006-10-22
Publisher Place New York
Access Restriction Subscribed
Content Type Text
Resource Type Article
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