By Barbara Chapman, Weimin Zheng, Guang R. Gao, Mitsuhisa Sato, Eduard Ayguadé, Dongsheng Wang

This booklet constitutes the completely refereed post-workshop court cases of the 3rd overseas Workshop on OpenMP, IWOMP 2007, held in Beijing, China, in June 2007.

The 14 revised complete papers and eight revised brief papers awarded have been rigorously reviewed and chosen from 28 submissions. The papers tackle all issues regarding OpenMP, similar to OpenMP functionality research and modeling, OpenMP functionality and correctness instruments and proposed OpenMP extensions, in addition to purposes in numerous domain names, e.g., clinical computation, games, special effects, multimedia, details retrieval, optimization, textual content processing, facts mining, finance, sign and picture processing, and numerical solvers.

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Extra resources for A Practical Programming Model for the Multi-Core Era: 3rd International Workshop on OpenMP, IWOMP 2007, Beijing, China, June 3-7, 2007 Proceedings

Example text

The current implementation of Nebelung library performs lazy conflict detection. Read and write sets are maintained dynamically and all memory operations are performed locally for the transaction. At commit time, the library checks if there is any conflict with other transactions. If conflict exists, the current transaction is committed and other transactions are aborted. In this way the transaction progress is guaranteed. 5 Source-to-Source Translation in Mercurium The Mercurium OpenMP source-to-source translator transforms the code inside the transaction block in such a way that for each memory access, a proper 46 M.

The inherent concurrency is limited by the number of task blocks, but also by the dependences between them. With this in mind, very good speedups are achieved. For programs with more task blocks and similar dependence structure higher speedups can be expected. Also interesting to observe is that after the saturation point the speedup remains stable and does not decrease. This is very desirable and demonstrates that no overhead is introduced for additional threads even if they cannot be employed efficiently.

3. Nebelung library interface to support the code generated by the Mercurium compiler Transactional Memory and OpenMP { 45 Transaction* t = createtx(); while (1) { starttx (t); if (setjmp (t->context) == TRANSACTION_STARTED) { (a) if (COMMIT_SUCCESS == committx (t)) break; else aborttx (t); } else aborttx (t); } destroytx (t); } (b) startTransaction(); // transaction body endTransaction(); (c) Fig. 4. Macros for (a) starting and (b) ending a transaction. (c) Code of the transaction surrounded by the previous macros.

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