Tested on Raspberry Pi cluster.
openmpi
mpi4py
helloworld.cc 每个进程输出 helloworld
bcast.cc 由主进程接收控制台输入并广播给各子进程
ring.cc 由主进程接收输入,然后根据进程序号依次传播
find_pi.cc 指定进程个数为 n,计算pi
Slice = 1000000 | Node number | Elapsed time | error | Cluster nodes = 2 | 161 | 2e-8 | Cluster nodes = 3 | 138 | 2e-8