mirror of https://github.com/QMCPACK/qmcpack.git
28 lines
782 B
C++
28 lines
782 B
C++
#if COMPILATION_INSTRUCTIONS
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mpicxx -O3 -std=c++14 -Wfatal-errors $0 -o $0x.x && time mpirun -np 4s $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/communicator.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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assert( world.size() == 4);
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std::vector<int> buffer(10);
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std::vector<int> buffer2(10); std::iota(buffer2.begin(), buffer2.end(), 0);
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int right = (world.rank() + 1)% world.size();
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int left = world.rank() - 1; if(left < 0) left = world.size() - 1;
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mpi3::request r = world.ireceive(buffer.begin(), buffer.end(), left, 123);
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world.send(buffer2.begin(), buffer2.end(), right, 123);
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// r.wait();
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mpi3::wait(r);
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assert( buffer == buffer2 );
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}
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