mirror of
https://github.com/triqs/dft_tools
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40 lines
1.0 KiB
ReStructuredText
40 lines
1.0 KiB
ReStructuredText
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.. highlight:: c
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MPI and serialization
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##########################################
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Serialization
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============================
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The `value classes` and the views are compatible with Boost Serialization library.
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MPI
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============================
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The `value classes` (array, matrix, vector) can be bcasted, reduced,
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with the boost.mpi library, e.g. :
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.. compileblock::
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#include <triqs/arrays.hpp>
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#include <boost/mpi.hpp>
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using triqs::arrays::array;using triqs::clef::placeholder;
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int main() {
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boost::mpi::environment env;//argc, argv);
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boost::mpi::communicator world;
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array<long,2> A (2,2), B(2,2),C(2,2);
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placeholder<0> i_; placeholder<1> j_;
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A(i_,j_) << (1+world.rank())*(10*i_+ j_);
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if (world.rank() ==0) std::cout<<" A = "<<A<<std::endl;
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boost::mpi::reduce (world, A,C, std::plus<array<long,2> >(),0);
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int s= world.size();
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if (world.rank() ==0) std::cout<<" C = "<<C<< " should be "<< array<long,2>( (s*(s+1)/2) * A) <<std::endl;
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}
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