comm .Alltoall(sendbuf, recvbuf): The all-to-all scatter/gather sends data from all-to-all processes in a group
comm.Alltoallv(sendbuf, recvbuf): The all-to-all scatter/gather vector sends data from all-to-all processes in a group, providing different amount of data and displacements
comm.Alltoallw(sendbuf, recvbuf): Generalized all-to-all communication allows different counts, displacements, and datatypes for each partner
In the following example, we'll see a
mpi4py implementation of
comm.Alltoall. We consider a communicator group of processes, where each process sends and receives an array of numerical data from the other processes defined in the group:
from mpi4py import MPI import numpy comm = MPI.COMM_WORLD size = comm.Get_size() rank = comm.Get_rank() a_size = 1 senddata = (rank...