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  1. #include <iostream>
  2. #include <vector>
  3. #include <mpi.h>
  4.  
  5. using namespace std;
  6.  
  7. int main(int argc, char* argv[]) {
  8.   MPI_Init(&argc, &argv);
  9.  
  10.   int rank, size;
  11.   MPI_Comm_rank(MPI_COMM_WORLD, &rank);
  12.   MPI_Comm_size(MPI_COMM_WORLD, &size);
  13.  
  14.   // Check if number of processes is a power of 2 (valid hypercube)
  15.   int dim = (int)log2(size);
  16.   if (size != (1 << dim)) {
  17.     if (rank == 0) {
  18.       cerr << "Error: Number of processes must be a power of 2 for a hypercube." << endl;
  19.     }
  20.     MPI_Finalize();
  21.     return 1;
  22.   }
  23.  
  24.   // Data to be broadcast (replace with your actual data)
  25.   int data = 10;
  26.  
  27.   // Broadcast loop (log2(size) iterations)
  28.   for (int i = 0; i < dim; ++i) {
  29.     // Partner selection based on binary representation of rank and i'th bit
  30.     int partner = rank ^ (1 << i);
  31.  
  32.     // Send data if current rank has a lower value in the i'th bit
  33.     if ((rank >> i) & 1) {
  34.       MPI_Send(&data, 1, MPI_INT, partner, 0, MPI_COMM_WORLD);
  35.     } else if (rank != partner) { // Receive data if not the source
  36.       MPI_Recv(&data, 1, MPI_INT, partner, 0, MPI_COMM_WORLD, MPI_STATUS_IGNORE);
  37.     }
  38.   }
  39.  
  40.   // Print the received data on all processes
  41.   cout << "Process " << rank << " received data: " << data << endl;
  42.  
  43.   MPI_Finalize();
  44.   return 0;
  45. }
Success #stdin #stdout #stderr 0.27s 40528KB
comments (?)
stdin 
Standard input is empty
stdout 
Standard output is empty
stderr 
Error: unexpected symbol in "using namespace"
Execution halted
https://ideone.com/ATPg8c
language:
R (R 3.5.2)
created:
15 days ago
visibility:
public

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