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TiDA: High-Level Programming Abstractions for Data Locality Management

  • Didem Unat
  • Tan Nguyen
  • Weiqun Zhang
  • Muhammed Nufail Farooqi
  • Burak Bastem
  • George Michelogiannakis
  • Ann Almgren
  • John Shalf
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 9697)

Abstract

The high energy costs for data movement compared to computation gives paramount importance to data locality management in programs. Managing data locality manually is not a trivial task and also complicates programming. Tiling is a well-known approach that provides both data locality and parallelism in an application. However, there is no standard programming construct to express tiling at the application level. We have developed a multicore programming model, TiDA, based on tiling and implemented the model as C++ and Fortran libraries. The proposed programming model has three high level abstractions, tiles, regions and tile iterator. These abstractions in the library hide the details of data decomposition, cache locality optimizations, and memory affinity management in the application. In this paper we unveil the internals of the library and demonstrate the performance and programability advantages of the model on five applications on multiple NUMA nodes. The library achieves up to 2.10x speedup over OpenMP in a single compute node for simple kernels, and up to 22x improvement over a single thread for a more complex combustion proxy application (SMC) on 24 cores. The MPI+TiDA implementation of geometric multigrid demonstrates a 30.9 % performance improvement over MPI+OpenMP when scaling to 3072 cores (excluding MPI communication overheads, 8.5 % otherwise).

Keywords

Iteration Space Adaptive Mesh Refinement Tile Size Multigrid Solver NUMA Node 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

Dr. Unat is supported by the Marie Sklodowska Curie Reintegration Grant 655965 by the European Commission. Authors from KU are supported by the Turkish Science and Technology Research Centre Grant No: 215E285. Authors from LBNL were supported by the SciDAC Program and the Exascale Co-Design Program under the U.S. DOE contract DE-AC02-05CH11231. This research used resources of the National Energy Research Scientific Computing Center, which is supported by the Office of Science of the U.S. DOE under Contract No. DE-AC02-05CH11231. We would like to acknowledge and thank John Bell and Hakan Memisoglu for their input.

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Copyright information

© Springer International Publishing Switzerland 2016

Authors and Affiliations

  • Didem Unat
    • 1
  • Tan Nguyen
    • 2
  • Weiqun Zhang
    • 2
  • Muhammed Nufail Farooqi
    • 1
  • Burak Bastem
    • 1
  • George Michelogiannakis
    • 2
  • Ann Almgren
    • 2
  • John Shalf
    • 2
  1. 1.Koç UniversityIstanbulTurkey
  2. 2.Lawrence Berkeley National LaboratoryBerkeleyUSA

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