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demonstrator_mpi.cc
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/**
* file demonstrator_mpi.cc
*
* @author Till Junge <till.junge@epfl.ch>
*
* @date 04 Apr 2018
*
* @brief MPI parallel demonstration problem
*
* @section LICENSE
*
* Copyright © 2018 Till Junge
*
* µSpectre 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, or (at
* your option) any later version.
*
* µSpectre 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 GNU Emacs; see the file COPYING. If not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include <iostream>
#include <memory>
#include <chrono>
#include "external/cxxopts.hpp"
#include "common/common.hh"
#include "common/ccoord_operations.hh"
#include "cell/cell_factory.hh"
#include "materials/material_linear_elastic1.hh"
#include "solver/solvers.hh"
#include "solver/solver_cg.hh"
using opt_ptr = std::unique_ptr<cxxopts::Options>;
opt_ptr parse_args(int argc, char **argv) {
opt_ptr options =
std::make_unique<cxxopts::Options>(argv[0], "Tests MPI fft scalability");
try {
options->add_options()
("0,N0", "number of rows", cxxopts::value<int>(), "N0")
("h,help", "print help")
("positional",
"Positional arguments: these are the arguments that are entered "
"without an option", cxxopts::value<std::vector<std::string>>());
options->parse_positional(std::vector<std::string>{"N0", "positional"});
options->parse(argc, argv);
if (options->count("help")) {
std::cout << options->help({"", "Group"}) << std::endl;
exit(0);
}
if (options->count("N0") != 1 ) {
throw cxxopts::OptionException("Parameter N0 missing");
} else if ((*options)["N0"].as<int>()%2 != 1) {
throw cxxopts::OptionException("N0 must be odd");
} else if (options->count("positional") > 0) {
throw cxxopts::OptionException("There are too many positional arguments");
}
} catch (const cxxopts::OptionException & e) {
std::cout << "Error parsing options: " << e.what() << std::endl;
exit(1);
}
return options;
}
using namespace muSpectre;
int main(int argc, char *argv[])
{
banner("demonstrator mpi", 2018, "Till Junge <till.junge@epfl.ch>");
auto options{parse_args(argc, argv)};
auto & opt{*options};
const Dim_t size{opt["N0"].as<int>()};
constexpr Real fsize{1.};
constexpr Dim_t dim{3};
const Dim_t nb_dofs{ipow(size, dim)*ipow(dim, 2)};
std::cout << "Number of dofs: " << nb_dofs << std::endl;
constexpr Formulation form{Formulation::finite_strain};
const Rcoord_t<dim> lengths{CcoordOps::get_cube<dim>(fsize)};
const Ccoord_t<dim> resolutions{CcoordOps::get_cube<dim>(size)};
{
Communicator comm{MPI_COMM_WORLD};
MPI_Init(&argc, &argv);
auto cell{make_parallel_cell<dim, dim>(resolutions, lengths, form, comm)};
constexpr Real E{1.0030648180242636};
constexpr Real nu{0.29930675909878679};
using Material_t = MaterialLinearElastic1<dim, dim>;
auto Material_soft{std::make_unique<Material_t>("soft", E, nu)};
auto Material_hard{std::make_unique<Material_t>("hard", 10*E, nu)};
int counter{0};
for (const auto && pixel:cell) {
int sum = 0;
for (Dim_t i = 0; i < dim; ++i) {
sum += pixel[i]*2 / resolutions[i];
}
if (sum == 0) {
Material_hard->add_pixel(pixel);
counter ++;
} else {
Material_soft->add_pixel(pixel);
}
}
if (comm.rank() == 0) {
std::cout << counter << " Pixel out of " << cell.size()
<< " are in the hard material" << std::endl;
}
cell.add_material(std::move(Material_soft));
cell.add_material(std::move(Material_hard));
cell.initialise(FFT_PlanFlags::measure);
constexpr Real newton_tol{1e-4};
constexpr Real cg_tol{1e-7};
const Uint maxiter = nb_dofs;
Grad_t<dim> DeltaF{Grad_t<dim>::Zero()};
DeltaF(0, 1) = .1;
Dim_t verbose {1};
auto start = std::chrono::high_resolution_clock::now();
GradIncrements<dim> grads{DeltaF};
SolverCG<dim> cg{cell, cg_tol, maxiter, bool(verbose)};
de_geus(cell, grads, cg, newton_tol, verbose);
std::chrono::duration<Real> dur = std::chrono::high_resolution_clock::now() - start;
if (comm.rank() == 0) {
std::cout << "Resolution time = " << dur.count() << "s" << std::endl;
}
MPI_Barrier(comm.get_mpi_comm());
}
MPI_Finalize();
return 0;
}

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