coarrays

Coarrays are native Fortran means for SPMD parallel programming. At runtime multiple copies of the executable (called images) are executing asynchronously. The F2008 standard provides coarray syntax, remote calls, coarray data objects, allocatable coarrays, syncronisation, atomics, etc.

F2018 adds new functionality, e.g. collectives, teams, events, more atomics. Coarrays are used extensively in CASUP library for HPC (https://cgpack.sourceforge.io).

The course is aimed at experienced Fortran users. Working knowledge of Fortran is assumed. The course is designed for a 1 day study with an instructor. Multiple exercises with full solutions are accompanied by notes. This course is taught to the University of Bristol HPC users. Exercises have been verified with Intel and GCC/OpenCoarrays.

All course materials are released under BSD license. We welcome contributions, provided you are happy to release your work under BSD license.

We welcome comments and problem reports.

Features

Cray, Intel, OpenCoarrays/GCC compilers supported
examples with solutions
PDF and HTML notes

Project Samples

Swap coarray values between images, SYNC ALL version

TAU tracing with jumpshot-4, 32 images on a single 16-core node, end of the program

TAU tracing with jumpshot-4, 32 images on a single 16-core node, shortly after program start

TAU paraprof for examples/prof/tau/9laplace/coback1-tau.f90 run with 10 images on a single 16-core node.

TAU paraprof for program examples/prof/tau/9laplace/coback1-tau.f90 compiled with ifort v.16, and run with 10 images on a single 16-core node. Note that MPI_Win_unlock dominates run time

Paraprof 3D bar chart for Laplacian sover with Intel compiler, on 10 images, single node. Note how coarray syntax is translated into MPI calls.

Project Activity

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License

BSD License

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Additional Project Details

Operating Systems

Linux, BSD

Intended Audience

Science/Research, Advanced End Users, Developers, End Users/Desktop, Testers, Engineering

User Interface

Console/Terminal, Command-line

Programming Language

Fortran

Related Categories

Fortran Scientific Engineering, Fortran Performance Testing Software

Registered

2016-02-01

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