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#include "FEDataStructures.h"
#include <iostream>
#include <mpi.h>
#include "FEAdaptor.h"
void SubCommunicatorDriver(int argc, char* argv[], MPI_Comm* handle)
{
Grid grid;
unsigned int numPoints[3] = { 70, 60, 44 };
double spacing[3] = { 1, 1.1, 1.3 };
grid.Initialize(numPoints, spacing);
Attributes attributes;
attributes.Initialize(&grid);
FEAdaptor::Initialize(argc, argv, handle);
unsigned int numberOfTimeSteps = 100;
for (unsigned int timeStep = 0; timeStep < numberOfTimeSteps; timeStep++)
{
// use a time step length of 0.1
double time = timeStep * 0.1;
attributes.UpdateFields(time);
FEAdaptor::CoProcess(grid, attributes, time, timeStep, timeStep == numberOfTimeSteps - 1);
}
FEAdaptor::Finalize();
}
int main(int argc, char* argv[])
{
MPI_Init(&argc, &argv);
int myrank, numprocs;
MPI_Comm_rank(MPI_COMM_WORLD, &myrank);
MPI_Comm_size(MPI_COMM_WORLD, &numprocs);
MPI_Group orig_group;
MPI_Comm_group(MPI_COMM_WORLD, &orig_group);
std::vector<int> subranks;
for (int i = 0; i < numprocs / 2; i++)
subranks.push_back(i);
if (subranks.empty())
{
subranks.push_back(0);
}
MPI_Group subgroup;
MPI_Group_incl(orig_group, subranks.size(), &(subranks[0]), &subgroup);
MPI_Comm subcommunicator;
MPI_Comm_create(MPI_COMM_WORLD, subgroup, &subcommunicator);
if (myrank < static_cast<int>(subranks.size()))
{
int newrank;
MPI_Comm_rank(MPI_COMM_WORLD, &newrank);
std::cout << "got a rank\n";
SubCommunicatorDriver(argc, argv, &subcommunicator);
std::cout << "Process " << myrank << " did some co-processing.\n";
}
else
{
std::cout << "Process " << myrank << " did not do any co-processing.\n";
}
MPI_Finalize();
return 0;
}
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