Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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#include <mpi.h>

  
int *Random_Num_Generator(int Num_Elements);

int Compute_Product(int *array, int num_elements);

int main(int argc, char* argv[]) 

  
   int comm_sz, my_rank;
int i, Result;
   int Num_Per_Proc = atoi(argv[1]);

   // Seed the random number generator to get different results each time 
   srand(time(NULL)); 

   MPI_Init(&argc, &argv);  

MPI_Comm_rank(MPI_COMM_WORLD, &my_rank);   
MPI_Comm_size(MPI_COMM_WORLD, &comm_sz);


   // Generate a random array of elements on process 0
int *Random_Nums = NULL;

if (my_rank == 0)
{
 Random_Nums = Random_Num_Generator(Num_Per_Proc * comm_sz);

 printf("The random numbers generated: \n");

 for (i = 0; i < Num_Per_Proc * comm_sz; i++)

  printf("%d; ", Random_Nums[i]);

 printf("\n");
}


   // Generate a buffer for holding a subset of the entire array 
int *Sub_Random_Nums = (int *)malloc(sizeof(int) * Num_Per_Proc);

   // Scatter the random integer numbers from process 0 to all processes 
MPI_Scatter(Random_Nums, Num_Per_Proc, MPI_INT, Sub_Random_Nums, Num_Per_Proc, MPI_INT, 0, MPI_COMM_WORLD);

   // Compute the product value of a subset array on each process
int Sub_Product = Compute_Product(Sub_Random_Nums, Num_Per_Proc);

// Reduce the total product value of all elements to process 0
MPI_Reduce(&Sub_Product,        , 1, MPI_INT,       , 0, MPI_COMM_WORLD);


if (my_rank == 0)

 printf("Total product of all elements is %d\n", Result);

   // Clean up 
if (my_rank == 0) 

  free(Random_Nums);
   
free(Sub_Random_Nums);
  
   MPI_Finalize(); 
 
return 0;

}


// Create an array of random integer numbers ranging from 1 to 10 
int *Random_Num_Generator(int Num_Elements)
{
 int *Rand_Nums = (int *)malloc(sizeof(int) * Num_Elements);
 int i;

 for (i = 0; i < Num_Elements; i++)
  Rand_Nums[i] = (rand() % 10) + 1;

 return Rand_Nums;
}

// Computes the product of an array of numbers 
int Compute_Product(int *array, int num_elements)
{
 int product = 1;
 int i;

 for (i = 0; i < num_elements; i++) 
  product *= array[i];
 
 return product;
}

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