編譯：/opt/gcc-4.2.4/bin/gcc -fopenmp -lm -o nbody nbody.c -L /opt/mpich-1.2.7pl/lib -I /opt/mpich-1.2.7pl/include -I /opt/gcc-4.2.4/include -lmpich

運行：
mpirun -nolocal -np 2 nbody sample_input.in 1000 sample_input.out