mirror of https://github.com/QMCPACK/qmcpack.git
29 lines
766 B
C++
29 lines
766 B
C++
#if COMPILATION_INSTRUCTIONS
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mpicxx -O3 -std=c++14 -Wall -Wfatal-errors $0 -o $0x.x && time mpirun -np 8 $0x.x $@ && rm -f $0x.x; exit
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#endif
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#include "alf/boost/mpi3/main.hpp"
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#include "alf/boost/mpi3/process.hpp"
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namespace mpi3 = boost::mpi3;
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using std::cout;
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int mpi3::main(int argc, char* argv[], mpi3::communicator& world){
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int token = -1;
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if(world.rank() != 0){
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world[world.rank() - 1] << token;
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cout << "proc " << world.rank() << " received token " << token << " from proc " << world.rank() -1 << '\n';
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};
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world[(world.rank() + 1)%world.size()] << token;
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if(world.rank() == 0){
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world[world.size() - 1] >> token;
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cout << "proc " << world.rank() << " received token " << token << " from proc " << world.size() - 1 << '\n';
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}
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return 0;
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}
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