/usr/share/octave/packages/mpi-1.2.0/hellosparsemat.m is in octave-mpi 1.2.0-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 | ## Copyright (C) 2009 Riccardo Corradini <riccardocorradini@yahoo.it>
## Copyright (C) 2012 Carlo de Falco
##
## This program is free software; you can redistribute it and/or modify it under
## the terms of the GNU General Public License as published by the Free Software
## Foundation; either version 3 of the License, or (at your option) any later
## version.
##
## This program is distributed in the hope that it will be useful, but WITHOUT
## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
## FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
## details.
##
## You should have received a copy of the GNU General Public License along with
## this program; if not, see <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {Function File} {} = hellosparsemat ()
## This function demonstrates sending and receiving a sparse matrix over MPI.
## Each process will send a a sparse matrix to process with rank 0, which will then display it.
## To run this example, set the variables HOSTFILE and NUMBER_OF_MPI_NODES to appropriate values,
## then type the following command in your shell:
## @example
## mpirun --hostfile $HOSTFILE -np $NUMBER_OF_MPI_NODES octave --eval 'pkg load mpi; hellosparsemat ()'
## @end example
## @seealso{hello2dimmat,helloworld,hellocell,hellostruct,mc_example,montecarlo,Pi}
## @end deftypefn
function hellosparsemat ()
MPI_Init();
## the string NEWORLD is just a label could be whatever you want
CW = MPI_Comm_Load ("NEWORLD");
my_rank = MPI_Comm_rank (CW);
p = MPI_Comm_size (CW);
## tag[0] ----> type of octave_value
## tag[1] ----> array of three elements 1) num of rows 2) number of columns 3) number of non zero elements
## tag[2] ----> vector of rowindex
## tag[3] ----> vector of columnindex
## tag[4] ----> vector of non zero elements
## These tags will be generated after mytag by the MPI_Send and MPI_Recv (see source code)
mytag = 48;
## Fill the sparse matrix
M = 5; N = 5; D = 0.9;
for one_by_one = p-1:-1:1 ## work one cpu at a time to make the output readable
if (my_rank != 0)
message = sprand (M, N, D);
dest = 0;
info = MPI_Send (message, dest, mytag, CW);
printf (["on rank %d MPI_Send returned the following ", ...
"error code (0 = Success): info = %d\n"], my_rank, info)
endif
MPI_Barrier (CW);
if (my_rank == 0)
source = one_by_one;
[messager, info] = MPI_Recv (source, mytag, CW);
printf (["MPI_Recv returned the following error code (0 = Success)", ...
" while receving from rank %d : info = %d\n"], source, info);
printf ("This is the matrix received from rank %d: \n", source);
disp (full (messager))
endif
MPI_Barrier (CW);
endfor
MPI_Finalize ();
endfunction
%!demo
%! system ("mpirun --hostfile $HOSTFILE -np $NUMBER_OF_MPI_NODES octave -q --eval 'pkg load mpi; hellosparsemat ()'");
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