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16th International Conference on Parallel Architecture and Compilation Techniques (PACT 2007) (2007)
Brasov, Romania
Sept. 15, 2007 to Sept. 19, 2007
ISSN: 1089-795X
ISBN: 0-7695-2944-5
pp: 388-398
Ian Watson , The University of Manchester, UK
Chris Kirkham , The University of Manchester, UK
Mikel Luj? , The University of Manchester, UK
Transactional memory proposes an alternative synchronization primitive to traditional locks. Its promise is to simplify the software development of multi-threaded applications while at the same time delivering the performance of parallel applications using (complex and error prone) fine grain locking. <p>This study reports our experience implementing a realistic application using transactional memory (TM). The application is Lee?s routing algorithm and was selected for its abundance of parallelism but difficulty of expressing it with locks. Each route between a source and a destination point in a grid can be considered a unit of parallelism. Starting from this simple approach, we evaluate the exploitable parallelism of a transactional parallel implementation and explore how it can be adapted to deliver better performance. The adaptations do not introduce locks nor alter the essence of the implemented algorithm, but deliver up to 20 times more parallelism. The adaptations are derived from understanding the application itself and TM. The evaluation simulates an abstracted TM system and, thus, the results are independent of specific software or hardware TM implemented, and describe properties of the application.</p>

C. Kirkham, I. Watson and M. Luj?, "A Study of a Transactional Parallel Routing Algorithm," 16th International Conference on Parallel Architecture and Compilation Techniques (PACT 2007)(PACT), Brasov, Romania, 2007, pp. 388-398.
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