def calculator(id, sliceSize, delta, output):
output.put(processSlice(id, sliceSize, delta))
#! /usr/bin/env python3
# Calculation of π using quadrature. This is an SPMD, Python with Cython extension realization using
# OpenMPI under the mpi4py package that provides Python binding to MPI.
#
# Copyright © 2010–2013 Russel Winder
from mpi4py import MPI
from numpy import array
from output import out
from time import time
from processSlice_cython_py3 import processSlice
if __name__ == '__main__':
n = 1000000000
delta = 1.0 / n
startTime = time()
comm = MPI.COMM_WORLD
myId = comm.Get_rank()
sliceSize = n // comm.Get_size()
localSum = array([processSlice(myId, sliceSize, delta)])
sum = array([0.0])
comm.Reduce((localSum, MPI.DOUBLE), (sum, MPI.DOUBLE))
if myId == 0:
pi = 4.0 * delta * sum[0]
elapseTime = time() - startTime
out(__file__, pi, n, elapseTime)
def calculator(channel, id, sliceSize, delta):
channel.write(processSlice(id, sliceSize, delta))
def calculator(id, sliceSize, delta, results):
results.put(processSlice(id, sliceSize, delta))