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  1. #include <mpi.h>
  2. #include <string>
  3. #include <iostream>
  4.  
  5. int main( int argc, char *argv[] )
  6.  
  7. {
  8.  
  9. // declare rank and the size of the process
  10. int rank, size;
  11.  
  12. MPI_Init( &argc, &argv );
  13.  
  14. MPI_Comm_rank(MPI_COMM_WORLD, &rank);
  15.  
  16. MPI_Comm_size(MPI_COMM_WORLD, &size);
  17.  
  18. int number = -1;
  19.  
  20. double startT = 0.0, endT = 0.0;
  21.  
  22. //MPI_Request ireq,ireq1;
  23.  
  24. //MPI_Status istatus,istatus2;
  25.  
  26. if (rank != 0) {
  27.  
  28. 	MPI_Recv(&number, 1, MPI_INT, rank-1, 0, MPI_COMM_WORLD,MPI_STATUS_IGNORE); // 	
  29. 	std::cout<<"Process "<< rank <<"recieved number "<< number << "from process "<< rank-1 << std::endl;
  30.  
  31. 	MPI_Send(&number, 1, MPI_INT, (rank+1)%size, 0, MPI_COMM_WORLD); // 0 sending to 1 
  32. 	std::cout<<"Process "<< rank <<"sent number "<< number << "to process "<< rank+1 << std::endl;
  33.  
  34.  
  35. } else 
  36. {
  37. 	number = 23;
  38. 	startT = MPI_Wtime();
  39. 	MPI_Send(&number, 1, MPI_INT, (rank+1)%size, 0, MPI_COMM_WORLD); // 0 sending to 1 
  40. 	//std::cout<<"Process "<< rank <<"sent number "<< number << "to process "<< rank+1 << std::endl;
  41.  
  42. 	}
  43.  
  44.  
  45. 	if (rank == 0) {
  46.  
  47.  
  48. 	MPI_Recv(&number, 1, MPI_INT, size-1, 0, MPI_COMM_WORLD,MPI_STATUS_IGNORE); // 	
  49. 	std::cout<<"Process "<< rank <<"recieved number "<< number << "from process "<< size-1 << std::endl;
  50. 	endT= MPI_Wtime();
  51. 	std::cout << "Duration =" << endT-startT << std::endl;
  52.  
  53.  
  54. }
  55.  
  56. MPI_Finalize();
  57. return 0;
  58.  
  59. }
  60.  
Success #stdin #stdout #stderr 0.27s 38820KB
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Standard input is empty
stdout
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Standard output is empty
stderr
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Error: unexpected symbol in "int main"
Execution halted
https://ideone.com/MJs1pK
language:
R (R 3.5.2)
created:
2 years ago
visibility:
public

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