mirror of
https://github.com/triqs/dft_tools
synced 2024-12-27 06:43:40 +01:00
100 lines
2.7 KiB
C++
100 lines
2.7 KiB
C++
/*******************************************************************************
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*
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* TRIQS: a Toolbox for Research in Interacting Quantum Systems
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*
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* Copyright (C) 2013 by O. Parcollet
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*
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* TRIQS is free software: you can redistribute it and/or modify it under the
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* terms of the GNU General Public License as published by the Free Software
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* Foundation, either version 3 of the License, or (at your option) any later
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* version.
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*
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* TRIQS is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License along with
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* TRIQS. If not, see <http://www.gnu.org/licenses/>.
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*
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******************************************************************************/
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#include <iostream>
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#include <type_traits>
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#include <triqs/arrays.hpp>
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#include <triqs/mpi.hpp>
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#include <iostream>
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#include <fstream>
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#include <sstream>
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using namespace triqs;
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using namespace triqs::arrays;
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using namespace triqs::mpi;
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struct my_object {
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array<double, 1> a, b;
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TRIQS_MPI_IMPLEMENTED_AS_TUPLEVIEW;
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my_object() = default;
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my_object(int s) : a(s), b(s) {
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clef::placeholder<0> i_;
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a(i_) << i_;
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b(i_) << -i_;
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}
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// construction from the lazy is delegated to =
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template <typename Tag> my_object(mpi_lazy<Tag, my_object> x) : my_object() { operator=(x); }
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// assigment is almost done already...
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template <typename Tag> my_object &operator=(mpi_lazy<Tag, my_object> x) {
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return mpi_impl<my_object>::complete_operation(*this, x);
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}
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};
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// non intrusive
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auto view_as_tuple(my_object const &x) RETURN(std::tie(x.a, x.b));
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auto view_as_tuple(my_object &x) RETURN(std::tie(x.a, x.b));
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// --------------------------------------
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int main(int argc, char *argv[]) {
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#ifdef TRIQS_C11
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mpi::environment env(argc, argv);
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mpi::communicator world;
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std::ofstream out("t2_node" + std::to_string(world.rank()));
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auto ob = my_object(10);
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mpi::broadcast(ob);
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out << " a = " << ob.a << std::endl;
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out << " b = " << ob.b << std::endl;
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auto ob2 = ob;
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// ok scatter all components
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ob2 = mpi::scatter(ob);
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out << " scattered a = " << ob2.a << std::endl;
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out << " scattered b = " << ob2.b << std::endl;
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ob2.a *= world.rank()+1; // change it a bit
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// now regroup...
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ob = mpi::gather(ob2);
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out << " gather a = " << ob.a << std::endl;
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out << " gather b = " << ob.b << std::endl;
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// allgather
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ob = mpi::allgather(ob2);
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out << " allgather a = " << ob.a << std::endl;
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out << " allgather b = " << ob.b << std::endl;
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out << "----------------------------"<< std::endl;
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#endif
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}
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