HPF/JA: extensions of High Performance Fortran for accelerating real‐world applications

Seo, Yoshiki; Iwashita, Hidetoshi; Ohta, Hiroshi; Sakagami, Hiroyuki

doi:10.1002/cpe.637

Cited by 6 publications

(3 citation statements)

References 6 publications

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“…The present simulation code is parallelized by high‐performance FORTRAN (HPF) with an averaged vectorization ratio of 99.0%, providing sufficient speed for real‐time simulation. HPF, an extension of FORTRAN language for parallel programming, was first defined in 1993 by the HPF Forum, which consists of major research laboratories and vendors of parallel processing [ High Performance FORTRAN Forum , 1997; Seo et al , 2002; Sakagami et al , 2002]. Parallelization instructions in this language include data mapping, computation mapping, and communication.…”

Section: System Configurationmentioning

confidence: 99%

Real‐time Earth magnetosphere simulator with three‐dimensional magnetohydrodynamic code

Den

Tanaka

Fujita³

et al. 2006

Space Weather

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1] We developed a real-time numerical simulator for the solar wind --space --magnetosphere -ionosphere coupling system, adopting the three-dimensional (3-D) magnetohydrodynamic (MHD) simulation code developed by Tanaka. By using the real-time solar wind data, which is available from the ACE spacecraft every minute, as the upstream boundary conditions for density, temperature, flow speed, and interplanetary magnetic field, our MHD simulation system can numerically reproduce the global response of the magnetosphere and ionosphere at the same time as in the real world. We achieved realtime 3-D simulations of the solar wind --magnetosphere --ionosphere coupling system with a 44 Â 56 Â 60 mesh size by adapting high-performance FORTRAN language with eight CPUs on a supercomputer system located at the National Institute of Information and Communications Technology (NICT). Simulated plasma temperature and density in geostationary orbit were also plotted as an index to predict satellite charging. In addition, we present real-time virtual AE indices obtained from simulation results that directly compare with geomagnetic field activities as well as real-time plasma temperature and density in geostationary orbit. Our real-time MHD simulator now runs routinely on NICT's supercomputer system. We will present a detailed configuration of the real-time simulator system in this paper. Some examples are presented from system output to show how solar wind variations result in geomagnetic disturbances.Citation: Den, M., et al. (2006), Real-time Earth magnetosphere simulator with three-dimensional magnetohydrodynamic code, Space Weather, 4, S06004,

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Section: System Configurationmentioning

confidence: 99%

Real‐time Earth magnetosphere simulator with three‐dimensional magnetohydrodynamic code

Den

Tanaka

Fujita³

et al. 2006

Space Weather

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“…JAHPF (Japan Association for HPF) [7], an informal coalition of HPC users and computer vendors in Japan setup in 1997 to promote the HPF language, has defined HPF/JA 1.0 [8] as a set of HPF extensions to give the users more control over sophisticated parallelization and communication optimizations. The extensions include parallelization of loops with complicated reductions, asynchronous communication, user-controllable shadow, and communication pattern reuse for irregular remote data accesses.…”

Section: High Performance Fortranmentioning

confidence: 99%

14.9 TFLOPS Three-Dimensional Fluid Simulation for Fusion Science with HPF on the Earth Simulator

Sakagami¹,

Murai²,

Seo³

et al. 2002

ACM/IEEE SC 2002 Conference (SC'02)

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We succeeded in getting 14.9 TFLOPS performance when running a plasma simulation code IMPACT-3D parallelized with High Performance Fortran on 512 nodes of the Earth Simulator. The theoretical peak performance of the 512 nodes is 32 TFLOPS, which means 45% of the peak performance was obtained with HPF. IMPACT-3D is an implosion analysis code using TVD scheme, which performs three-dimensional compressible and inviscid Eulerian fluid computation with the explicit 5-point stencil scheme for spatial differentiation and the fractional time step for time integration. The mesh size is 2048x2048x4096, and the third dimension was distributed for the parallelization. The HPF system used in the evaluation is HPF/ES, developed for the Earth Simulator by enhancing NEC HPF/SX V2 mainly in communication scalability. Shift communications were manually tuned to get best performance by using HPF/JA extensions, which was designed to give the users more control over sophisticated parallelization and communication optimizations.

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“…Since a program is described with a pure data-parallel paradigm (single control thread and data treated in global name space) in HPF, it has high affinity with traditional Fortran in programming styles. Recently, a Japanese computer vender, NEC, has released a HPF compiler equipped with the HPF/JA extensions [1] for the vector-parallel supercomputers, SX series and the Earth Simulator. The HPF compiler is very reliable and facilitates getting good performance for realworld scientific applications [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Parallelization of SPEC OMP benchmark programs with HPF and evaluation of their performances

Sakagami

Morii

2006

J. Plasma Phys.

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OpenMP is a directive-oriented paradigm for parallel programming applicable to shared memory parallel computers. On the other hand, High Performance Fortron (HPF) is also a directive-oriented paradigm but for distributed memory machines. Thus, it could be very interesting to compare their programming applicability and parallel performances. We have converted four SPEC OMP 2001 benchmark programs, which are written with OpenMP and designed to evaluate the performance of shared memory parallel computers, into HPF, and evaluated parallel performances. We also point out problems that we had faced during conversion, and discuss solutions for them. Finally, we have improved the HPF performance by modifying the original source code. We could get good performance with HPF quite similar to OpenMP with SWIM, and moderate performance with APSI.

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HPF/JA: extensions of High Performance Fortran for accelerating real‐world applications

Cited by 6 publications

References 6 publications

Real‐time Earth magnetosphere simulator with three‐dimensional magnetohydrodynamic code

Real‐time Earth magnetosphere simulator with three‐dimensional magnetohydrodynamic code

14.9 TFLOPS Three-Dimensional Fluid Simulation for Fusion Science with HPF on the Earth Simulator

Parallelization of SPEC OMP benchmark programs with HPF and evaluation of their performances

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