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72 lines
2.5 KiB
C++
72 lines
2.5 KiB
C++
1 year ago
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#include <mpi.h>
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#include <iostream>
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/*
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MPI_Send(
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void* data, //data buffer
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int count, //count of elements
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MPI_Datatype datatype, //type of element
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int destination, //rank of receiver
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int tag, //tag of message
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MPI_Comm communicator //communicator
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)
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MPI_Recv(
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void* data, //data buffer
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int count, //count of elements
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MPI_Datatype datatype, //type of element
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int source, //rank of receiver
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int tag, //tag of message
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MPI_Comm communicator, //communicator
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MPI_Status* status //about received message
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)
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*/
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int main(int argc, char* argv[])
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{
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const long long PINGPONG_MAX = 3;
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MPI_Init(NULL, NULL); //Initialize the MPI environment
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int world_size;
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MPI_Comm_size(MPI_COMM_WORLD, &world_size); //Get the number of processes
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int world_rank;
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MPI_Comm_rank(MPI_COMM_WORLD, &world_rank); //Get the number of process
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if (world_size % 2 != 0)
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{
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std::cerr << "World size must be pair, actually is " << world_rank+1 << " (odd)" << std::endl;
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MPI_Abort(MPI_COMM_WORLD, 1);
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}
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long long pingpong_count = 0;
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int partner_rank;
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if (world_rank % 2 == 0)
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partner_rank = (world_rank + 1);
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else
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partner_rank = (world_rank - 1);
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std::cout << "Process (rank " << world_rank+1 << "/" << world_size << "): my partner is " << partner_rank+1 << std::endl;
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MPI_Barrier(MPI_COMM_WORLD);
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if (world_rank == 0)
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std::cout << "Passed Barrier" << std::endl;
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while (pingpong_count < PINGPONG_MAX)
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{
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if (world_rank%2 == pingpong_count%2)
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{
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pingpong_count++;
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// MPI_Send(data, count, datatype, dest, tag, communicator)
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MPI_Send(&pingpong_count, 1, MPI_LONG_LONG, partner_rank, 0, MPI_COMM_WORLD);
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std::cout << "Process (rank " << world_rank+1 << "/" << world_size << ") sent '" << pingpong_count << "' to " << partner_rank+1 << std::endl;
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}
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else
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{
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// MPI_Recv(data, count, datatype, source, tag, communicator, status)
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MPI_Recv(&pingpong_count, 1, MPI_LONG_LONG, partner_rank, 0, MPI_COMM_WORLD, MPI_STATUS_IGNORE);
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std::cout << "Process (rank " << world_rank+1 << "/" << world_size << ") received '" << pingpong_count << "' from " << partner_rank+1 << std::endl;
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}
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}
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MPI_Finalize(); //Clean up the MPI environment
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return 0;
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}
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