CLOMP: Accurately Characterizing OpenMP Application Overheads

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Despite its ease of use, OpenMP has failed to gain widespread use on large scale systems, largely due to its failure to deliver sufficient performance. Our experience indicates that the cost of initiating OpenMP regions is simply too high for the desired OpenMP usage scenario of many applications. In this paper, we introduce CLOMP, a new benchmark to characterize this aspect of OpenMP implementations accurately. CLOMP complements the existing EPCC benchmark suite to provide simple, easy to understand measurements of OpenMP overheads in the context of application usage scenarios. Our results for several OpenMP implementations demonstrate that CLOMP identifies the ... continued below

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Bronevetsky, G; Gyllenhaal, J & de Supinski, B February 11, 2008.

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Despite its ease of use, OpenMP has failed to gain widespread use on large scale systems, largely due to its failure to deliver sufficient performance. Our experience indicates that the cost of initiating OpenMP regions is simply too high for the desired OpenMP usage scenario of many applications. In this paper, we introduce CLOMP, a new benchmark to characterize this aspect of OpenMP implementations accurately. CLOMP complements the existing EPCC benchmark suite to provide simple, easy to understand measurements of OpenMP overheads in the context of application usage scenarios. Our results for several OpenMP implementations demonstrate that CLOMP identifies the amount of work required to compensate for the overheads observed with EPCC. Further, we show that CLOMP also captures limitations for OpenMP parallelization on NUMA systems.

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PDF-file: 15 pages; size: 3.5 Mbytes

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  • Presented at: International Workshop on OpenMP, West Lafayette, IN, United States, May 12 - May 14, 2008

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  • Report No.: LLNL-CONF-401267
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 929528
  • Archival Resource Key: ark:/67531/metadc895338

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  • February 11, 2008

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  • Sept. 27, 2016, 1:39 a.m.

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  • Nov. 22, 2016, 10:34 p.m.

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Bronevetsky, G; Gyllenhaal, J & de Supinski, B. CLOMP: Accurately Characterizing OpenMP Application Overheads, article, February 11, 2008; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc895338/: accessed July 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.