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  1. #include <iostream>
  2. #include <mpi.h>
  3.  
  4. int main() {
  5.     MPI_Init(NULL, NULL);
  6.  
  7.     int rank, size;
  8.     MPI_Comm_rank(MPI_COMM_WORLD, &rank);
  9.     MPI_Comm_size(MPI_COMM_WORLD, &size);
  10.  
  11.     if (size != 2) {
  12.         std::cout << "This program requires exactly 2 processes.\n";
  13.         MPI_Finalize();
  14.         return 1;
  15.     }
  16.  
  17.     int x = 12345;  // Sample data to be sent
  18.  
  19.     if (rank == 0) {
  20.         double T1 = MPI_Wtime();
  21.         MPI_Send(&x, 1, MPI_INT, 1, 0, MPI_COMM_WORLD);  // Sending data to process 1
  22.         double T2 = MPI_Wtime();
  23.         double TP0 = T2 - T1;
  24.         double TP1;
  25.         MPI_Recv(&TP1, 1, MPI_DOUBLE, 1, 0, MPI_COMM_WORLD, MPI_STATUS_IGNORE);  // Receiving data from process 1
  26.         std::cout << "TP0: " << TP0 << std::endl;
  27.         std::cout << "TP1: " << TP1 << std::endl;
  28.     }
  29.     else {
  30.         double T1 = MPI_Wtime();
  31.         MPI_Recv(&x, 1, MPI_INT, 0, 0, MPI_COMM_WORLD, MPI_STATUS_IGNORE);  // Receiving data from process 0
  32.         double T2 = MPI_Wtime();
  33.         double TP1 = T2 - T1;
  34.         MPI_Send(&TP1, 1, MPI_DOUBLE, 0, 0, MPI_COMM_WORLD);  // Sending data to process 0
  35.     }
  36.  
  37.     MPI_Finalize();
  38.     return 0;
  39. }
Success #stdin #stdout #stderr 0.27s 40844KB
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Standard input is empty
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Standard output is empty
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Error: unexpected symbol in "int main"
Execution halted
https://ideone.com/1pAG4r
language:
R (R 3.5.2)
created:
29 days ago
visibility:
public

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