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#!/usr/bin/env python
if False:
import mpi4py
name = "name" # lib{name}.so
path = []
mpi4py.profile(name, path=path)
from mpi4py import MPI
comm = MPI.COMM_WORLD
size = comm.Get_size()
rank = comm.Get_rank()
src = rank - 1
dest = rank + 1
if rank == 0:
src = size - 1
if rank == size - 1:
dest = 0
try:
from numpy import zeros
a1 = zeros(1000000, "d")
a2 = zeros(1000000, "d")
except ImportError:
from array import array
a1 = array("d", [0] * 1000)
a1 *= 1000
a2 = array("d", [0] * 1000)
a2 *= 1000
comm.Sendrecv(
sendbuf=a1,
recvbuf=a2,
source=src,
dest=dest,
)
MPI.Request.Waitall([
comm.Isend(a1, dest=dest),
comm.Irecv(a2, source=src),
])
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