mirror of https://github.com/QMCPACK/qmcpack.git
26 lines
738 B
C++
26 lines
738 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(400);
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if(world.root()){
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for(int i = 0; i != world.size(); ++i) buffer[i] = i/100;
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std::vector<mpi3::request> rs(3);
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for(int i = 0; i != world.size() - 1; ++i){
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rs[i] = world.isend(&buffer[i*100], &buffer[i*100] + 100, i + 1, 123);
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}
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wait_all(rs.begin(), rs.end());
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}else world.receive(buffer.begin(), buffer.begin() + 100, 0, 123);
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}
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