Good Evening All,
I'm very new to using MPI; I seem to be struggling to get a basic understanding
of the MPI::Comm_World.Scatter Operation, It seem's as though a may be
misunderstanding how the scatter operation works. Suppose i have an Array of x
amount of doubles, let's say 3 doubles that i want to spread across three
processes.
I have -
#include <iostream>#include <mpi.h>
int main(int argc, char* argv[]){ MPI_Init(&argc, &argv); int rank,
procs; MPI_Comm_size(MPI_COMM_WORLD, &procs);
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
double stat[3] ; stat[0] = 1.2; stat[1] = 65.3; stat[2] = 45.3;
double test3[3];
if (rank==0) {
MPI::COMM_WORLD.Scatter( stat, 1, MPI::DOUBLE,
&test3, 1, MPI::DOUBLE, 0); }
std::cout << rank <<" rec'd " << test3[0] << std::endl;
MPI_Finalize();}
Unfortunately, this doesn't output what i'd like. I'd like: Process 0 to output
1.2, process 1 to output 65.3 and process 2 to output 45.3 etc etc. I apologise
if this question is very trivial.
Regards,
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