A Case for Including Transactions in OpenMP

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Transactional Memory (TM) has received significant attention recently as a mechanism to reduce the complexity of shared memory programming. We explore the potential of TM to improve OpenMP applications. We combine a software TM (STM) system to support transactions with an OpenMP implementation to start thread teams and provide task and loop-level parallelization. We apply this system to two application scenarios that reflect realistic TM use cases. Our results with this system demonstrate that even with the relatively high overheads of STM, transactions can outperform OpenMP critical sections by 10%. Overall, our study demonstrates that extending OpenMP to include transactions ... continued below

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PDF-file: 14 pages; size: 0.4 Mbytes

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Wong, M; Bihari, B L; de Supinski, B R; Wu, P; Michael, M; Liu, Y et al. January 25, 2010.

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Transactional Memory (TM) has received significant attention recently as a mechanism to reduce the complexity of shared memory programming. We explore the potential of TM to improve OpenMP applications. We combine a software TM (STM) system to support transactions with an OpenMP implementation to start thread teams and provide task and loop-level parallelization. We apply this system to two application scenarios that reflect realistic TM use cases. Our results with this system demonstrate that even with the relatively high overheads of STM, transactions can outperform OpenMP critical sections by 10%. Overall, our study demonstrates that extending OpenMP to include transactions would ease programming effort while allowing improved performance.

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PDF-file: 14 pages; size: 0.4 Mbytes

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  • Presented at: International Workshop on OpenMP, Tsukuba, Japan, Jun 14 - Jun 16, 2010

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  • Report No.: LLNL-CONF-422888
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 988955
  • Archival Resource Key: ark:/67531/metadc1013258

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  • January 25, 2010

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  • Oct. 14, 2017, 8:36 a.m.

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  • Oct. 27, 2017, 5:32 p.m.

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Wong, M; Bihari, B L; de Supinski, B R; Wu, P; Michael, M; Liu, Y et al. A Case for Including Transactions in OpenMP, article, January 25, 2010; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc1013258/: accessed September 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.