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并行计算的例子程序 环境需要lam/Linux 可从lam-mpi.org找到

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Copyright (c) 1998-2001 University of Notre Dame. 
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Copyright (c) 1994-1998 The Ohio State University.  
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This file is part of the LAM/MPI software package.  For license
information, see the LICENSE file in the top level directory of the
LAM/MPI source distribution.

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This simple program prints the canonical "Hello, world!" message for
each MPI process that is started.  The message indicates the MPI rank
number and total number of MPI processes in the job.

Use make to compile these programs.  Make will use mpicc to compile it:

       mpicc -o hello hello.c

This program can be run with any number of MPI processes (including
1).  For example:

       mpirun C hello