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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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This sample program makes a catesian and graph topology with 4 MPI
processes.

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

       mpic++ -o cxx_topology cxx_topology.cc

This program is designed to be run with 4 MPI processes:

       mpirun -np 4 cxx_topology