XcalableMP PGAS Programming Language

1. Front Matter

   Pages i-ix

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2. XcalableMP Programming Model and Language

   • Hitoshi Murai, Masahiro Nakao, Mitsuhisa Sato

   Pages 1-71Open Access

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3. Implementation and Performance Evaluation of Omni Compiler

   • Masahiro Nakao, Hitoshi Murai

   Pages 73-96Open Access

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4. Coarrays in the Context of XcalableMP

   • Hidetoshi Iwashita, Masahiro Nakao

   Pages 97-122Open Access

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5. XcalableACC: An Integration of XcalableMP and OpenACC

   • Akihiro Tabuchi, Hitoshi Murai, Masahiro Nakao, Tetsuya Odajima, Taisuke Boku

   Pages 123-146Open Access

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6. Mixed-Language Programming with XcalableMP

   • Masahiro Nakao

   Pages 147-163Open Access

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7. Three-Dimensional Fluid Code with XcalableMP

   • Hitoshi Sakagami

   Pages 165-179Open Access

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8. Hybrid-View Programming of Nuclear Fusion Simulation Code in XcalableMP

   • Keisuke Tsugane, Taisuke Boku, Hitoshi Murai, Mitsuhisa Sato, William Tang, Bei Wang

   Pages 181-203Open Access

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9. Parallelization of Atomic Image Reconstruction from X-ray Fluorescence Holograms with XcalableMP

   • Atsushi Kubota, Tomohiro Matsushita, Naohisa Happo

   Pages 205-218Open Access

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10. Multi-SPMD Programming Model with YML and XcalableMP

    • Miwako Tsuji, Hitoshi Murai, Taisuke Boku, Mitsuhisa Sato, Serge G. Petiton, Nahid Emad et al.

    Pages 219-243Open Access

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11. XcalableMP 2.0 and Future Directions

    • Mitsuhisa Sato, Hitoshi Murai, Masahiro Nakao, Keisuke Tsugane, Tesuya Odajima, Jinpil Lee

    Pages 245-262Open Access

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XcalableMP is a directive-based parallel programming language based on Fortran and C, supporting a Partitioned Global Address Space (PGAS) model for distributed memory parallel systems. This open access book presents XcalableMP language from its programming model and basic concept to the experience and performance of applications described in XcalableMP.　

XcalableMP was taken as a parallel programming language project in the FLAGSHIP 2020 project, which was to develop the Japanese flagship supercomputer, Fugaku, for improving the productivity of parallel programing. XcalableMP is now available on Fugaku and its performance is enhanced by the Fugaku interconnect, Tofu-D.

The global-view programming model of XcalableMP, inherited from High-Performance Fortran (HPF), provides an easy and useful solution to parallelize data-parallel programs with directives for distributed global array and work distribution and shadow communication. The local-view programming adopts coarray notation from Coarray Fortran (CAF) to describe explicit communication in a PGAS model. The language specification was designed and proposed by the XcalableMP Specification Working Group organized in the PC Consortium, Japan.

The Omni XcalableMP compiler is a production-level reference implementation of XcalableMP compiler for C and Fortran 2008, developed by RIKEN CCS and the University of Tsukuba. The performance of the XcalableMP program was used in the Fugaku as well as the K computer. A performance study showed that XcalableMP enables a scalable performance comparable to the message passing interface (MPI) version with a clean and easy-to-understand programming style requiring little effort.

• PGAS model
• Partitioned Global Address Space model
• Coarray
• parallel programming language
• high performance computing
• Open Access

• Programming Envt Research Team, RIKEN Center for Computational Science, Kobe, Japan

  Mitsuhisa Sato

Mitsuhisa Sato is a deputy director of the RIKEN Center for Computational Science (R-CCS). He was a professor at the Graduate School of Systems and Information Engineering, University of Tsukuba from 2001. He has been working as a director of the Center for Computational Sciences, University of Tsukuba from 2007 to 2013. Since October 2010, he is appointed to the research team leader of programming environment research team in the Advanced Institute of Computational Science (AICS), former R-CCS, which was the organization to run Japanese petaflops facility "K computer". Since 2014, he is working as a team leader of architecture development team in the Japanese FLAGSHIP2020 project to develop the next system of the K computer in R-CCS. He is a professor (Cooperative Graduate School Program) and professor emeritus of University of Tsukuba. 

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