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void mpipingpong::run() { this->mpi_->init(); mpicomm world = this->mpi_->comm_world(); mpitype type = mpitype::mpi_double; int rank = world.rank().id; int size = world.size().id; if(! ((size % 2) && (rank+1 >= size))) { // With an odd number of nodes, rank (size-1) mpiid peer(rank ^ 1); // partner nodes 0<=>1, mpiapi::const_mpistatus_t stat; for(int half_cycle = 0; half_cycle < 2*niter; if((half_cycle + rank) & 1) mpi_->send(count_, type, peer, mpitag(0), else mpi_->recv(count_, type, peer, mpitag(0), } } mpi_->finalize(); }

sits out 2<=>3, etc. ++half_cycle) { world); world, stat);

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