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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 approximates the value of pi using different
numbers of integration points (from 2 to 1000).

Use make to compile these programs.  Make will use mpicc, mpic++, and
mpif77 to compile these programs:

       mpicc -o cpi cpi.c -lm
       mpic++ -o cxxpi cxxpi.cc -lm
       mpif77 -o fpi fpi.f -lm

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

       mpirun C cpi
       mpirun C cxxpi
       mpirun C fpi