Segmented alignment: An enhanced model to align data parallel programs of HPF

Gwan Hwan Hwang, Cheng Wei Chen, Jenq Kuen Lee*, Roy Dz-Ching Ju


研究成果: 雜誌貢獻期刊論文同行評審


In this paper, we propose a new automatic data alignment model called segmented alignment. The conventional data alignment model, such as that used in High-Performance Fortran (HPF), aligns arrays with the whole index domain. The principle of our proposed segmented alignment is to allow alignment relations within delimited index domains. We first provide motivating examples to illustrate how code fragments of HPF with EOSHIFT or CSHIFT operations, or produced by synthesis operations can benefit from our enhanced alignment scheme. Second, we show that this new model can be implemented in HPF-like languages by adding WHEN and IN constructs to them. In addition, we show that the new proposed schemes for WHEN and IN constructs can be emulated using standard HPF syntax. Finally, we address issues related to automatic data alignment for the new proposed model, and present an algorithm to automatically align programs using our segmented alignment scheme. Since the optimal algorithm to do this is NP-hard. a practical heuristic is also given. Our experiments were performed on a DEC Alpha Farm with HPF environments. Our experiments confirm our theory that our proposed alignment scheme can significantly enhance not only the performance of HPF code fragments with EOSHIFT or CSHIFT operations, but also that of codes produced by synthesis operations.

頁(從 - 到)17-41
期刊Journal of Supercomputing
出版狀態已發佈 - 2003 5月

ASJC Scopus subject areas

  • 軟體
  • 理論電腦科學
  • 資訊系統
  • 硬體和架構


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