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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <omp.h>
  4.  
  5. #define SIZE 1000000
  6.  
  7. int main() {
  8.     int *arr = (int*)malloc(SIZE * sizeof(int));
  9.     int sum_parallel_for = 0;
  10.     int sum_sections = 0;
  11.  
  12.     // Initialize array with random values
  13.     for (int i = 0; i < SIZE; ++i) {
  14.         arr[i] = rand() % 100; 
  15.     }
  16.  
  17.     // Work sharing with parallel for
  18.     #pragma omp parallel for reduction(+:sum_parallel_for)
  19.     for (int i = 0; i < SIZE; ++i) {
  20.         sum_parallel_for += arr[i];
  21.     }
  22.  
  23.     // Work sharing with sections
  24.     #pragma omp parallel sections
  25.     {
  26.         #pragma omp section
  27.         {
  28.             for (int i = 0; i < SIZE / 2; ++i) {
  29.                 sum_sections += arr[i];
  30.             }
  31.         }
  32.         #pragma omp section
  33.         {
  34.             for (int i = SIZE / 2; i < SIZE; ++i) {
  35.                 sum_sections += arr[i];
  36.             }
  37.         }
  38.     }
  39.  
  40.     printf("Sum using parallel for: %d\n", sum_parallel_for);
  41.     printf("Sum using sections: %d\n", sum_sections);
  42.  
  43.     free(arr);
  44.  
  45.     return 0;
  46. }
Success #stdin #stdout 0.03s 5284KB
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Standard input is empty
stdout
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Sum using parallel for: 49498583
Sum using sections: 49498583
https://ideone.com/xhamqO
language:
C (gcc 8.3)
created:
12 days ago
visibility:
public

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