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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <mpi.h>
  4.  
  5. int main(int argc, char *argv[]) {
  6.     int rank, size;
  7.     double serial_time = 10.0; // Example serial execution time in seconds
  8.     double parallel_time;      // Example parallel execution time
  9.     double speedup, efficiency;
  10.  
  11.     MPI_Init(&argc, &argv);
  12.     MPI_Comm_rank(MPI_COMM_WORLD, &rank);
  13.     MPI_Comm_size(MPI_COMM_WORLD, &size);
  14.  
  15.     // Assume parallel_time is measured differently for each process
  16.     // Example: divide the serial time by the rank
  17.     parallel_time = serial_time / (rank + 1);
  18.  
  19.     // Calculate speedup
  20.     MPI_Reduce(&parallel_time, &speedup, 1, MPI_DOUBLE, MPI_MIN, 0, MPI_COMM_WORLD);
  21.     speedup = serial_time / speedup;
  22.  
  23.     // Calculate efficiency
  24.     efficiency = speedup / size;
  25.  
  26.     if (rank == 0) {
  27.         printf("Speedup: %lf\n", speedup);
  28.         printf("Efficiency: %lf\n", efficiency);
  29.     }
  30.  
  31.     MPI_Finalize();
  32.     return 0;
  33. }
Success #stdin #stdout #stderr 0.26s 40260KB
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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/YdG8B8
language:
R (R 3.5.2)
created:
13 days ago
visibility:
public

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