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automatic parallel code generation for message passing on distributed memory systems

parallel COMPUTING 1996年第2期22卷 227-258页

作者： Johnson, SP Ierotheou, CS Cross, M UNIV GREENWICH PARALLEL PROC RES GRPCTR NUMER MODELLING & PROC ANALLONDON SE18 6PFENGLAND

The availability of a very accurate dependence graph for a scalar code is the basis for the automatic generation of an efficient parallel implementation. The strategy for this task which is encapsulated in a comprehensive data partitioning code generation algorithm is described. This algorithm involves the data partition, calculation of assignment ranges for partitioned arrays, addition of a comprehensive set of execution control masks, altering loop limits, addition and optimisation of communications for all data. In this context, the development and implementation of strategies to merge communications wherever possible has proved an important feature in producing efficient parallel implementations for numerical mesh based codes. The code generation strategies described here are embedded within the Computer Aided parallelisation tools (CAPTools) software as a key part of a toolkit for automating as much as possible of the parallelisation process for mesh based numerical codes. The algorithms used enables parallelisation of real computational mechanics codes with only minor user interaction and without any prior manual customisation of the serial code to suit the parallelisation tool.

关键词： parallelisation tools interprocedural dependence analysis automatic parallel code generation

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Computer aided parallelisation tools (CAPTools) - Conceptual overview and performance on the parallelisation of structured mesh codes

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parallel COMPUTING 1996年第2期22卷 163-195页

作者： Ierotheou, CS Johnson, SP Cross, M Leggett, PF UNIV GREENWICH PARALLEL PROC RES GRP CTR NUMER MODELLING & PROC ANAL LONDON SE18 6PF ENGLAND

Computer Aided parallelisation Tools (CAPTools) is a toolkit designed to automate as much as possible of the process of parallelising scalar FORTRAN 77 codes. The toolkit combines a very powerful dependence analysis together with user supplied knowledge to build an extremely comprehensive and accurate dependence graph. The initial version has been targeted at structured mesh computational mechanics codes (eg. heat transfer, Computational Fluid Dynamics (CFD)) and the associated simple mesh decomposition paradigm is utilised in the automatic code partition, execution control mask generation and communication call insertion. In this, the first of a series of papers [1-3] the authors discuss the parallelisations of a number of case study codes showing how the various component tools may be used to develop a highly efficient parallel implementation in a few hours or days. The details of the parallelisation of the TEAMKE1 CFD code are described together with the results of three other numerical codes. The resulting parallel implementations are then tested on workstation clusters using PVM and an i860-based parallel system showing efficiencies well over 80%.

关键词： parallelisation tools interprocedural dependence analysis automatic parallel code generation parallel performance results user interaction

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The Scalable Modeling System: directive-based code parallelization for distributed and shared memory computers

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parallel COMPUTING 2003年第8期29卷 995-1020页

作者： Govett, M Hart, L Henderson, T Middlecoff, J Schaffer, D Natl Ocean & Atmospher Adm Forecast Syst Lab Boulder CO 80305 USA Natl Ctr Atmospher Res Global Climate & Dynam Div Boulder CO 80305 USA Colorado State Univ Cooperat Inst Res Atmosphere Ft Collins CO 80523 USA

A directive-based parallelization tool called the Scalable Modeling System (SMS) is described. The user inserts directives in the form of comments into existing Fortran code. SMS translates the code and directives into a parallel version that runs efficiently on shared and distributed memory high-performance computing platforms including the SGI Origin, IBM SP2, Cray T3E, Sun, and Alpha and Intel clusters. Twenty directives are available to support operations including array re-declarations, inter-process communications, loop translations, and parallel I/O operations. SMS also provides tools to support incremental parallelization and debugging that significantly reduces code parallelization. time from months to weeks of effort. SMS is intended for applications using regular structured grids that are solved using finite difference approximation or spectral methods. It has been used to parallelize 10 atmospheric and oceanic models, but the tool is sufficiently general that it can be applied to other structured grids codes. Recent performance comparisons demonstrate that the Eta, Hybrid Coordinate Ocean model and Regional Ocean Modeling System model, parallelized using SMS, perform as well or better than their OpenMP or Message Passing Interface counterparts. (C) 2003 Elsevier B.V. All rights reserved.

关键词： directive-based parallelization tool weather and ocean models automatic parallel code generation Fortran source code translator distributed memory computers

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Using an interactive parallelisation toolkit to parallelise an ocean modelling code

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FUTURE generation COMPUTER SYSTEMS-THE INTERNATIONAL JOURNAL OF ESCIENCE 2003年第5期19卷 789-801页

作者： Ierotheou, CS Johnson, SP Leggett, PF Cross, M Univ Greenwich Old Royal Naval Coll Parallel Proc Res Grp London SE10 9LS England

This paper describes an interactive parallelisation toolkit that can be used to generate parallel code suitable for either a distributed memory system (using message passing) or a shared memory system (using OpenMP). This study focuses on how the toolkit is used to parallelise a complex heterogeneous ocean modelling code within a few hours for use on a shared memory parallel system. The generated parallel code is essentially the serial code with OpenMP directives added to express the parallelism. The results show that substantial gains in performance can be achieved over the single thread version with very little effort. (C) 2002 Elsevier Science B.V. All rights reserved.

关键词： interactive parallelisation tools global ocean model code OpenMP shared memory parallelisation automatic parallel code generation

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