fork download
copy 
  1. #include <stdio.h>
  2. #include <omp.h>
  3. #include <time.h>
  4.  
  5. void sequential_execution() {
  6.     int sum = 0;
  7.     clock_t start = clock();
  8.     for (int i = 0; i < 1000000; ++i) {
  9.         sum += i;
  10.     }
  11.     clock_t end = clock();
  12.     double duration = (double)(end - start) / CLOCKS_PER_SEC;
  13.     printf("Sequential execution time: %f seconds\n", duration);
  14.     printf("Sum (Sequential): %d\n", sum);
  15. }
  16.  
  17. void parallel_execution(int num_threads) {
  18.     int sum = 0;
  19.     clock_t start = clock();
  20.     #pragma omp parallel for num_threads(num_threads) reduction(+:sum)
  21.     for (int i = 0; i < 1000000; ++i) {
  22.         sum += i;
  23.     }
  24.     clock_t end = clock();
  25.     double duration = (double)(end - start) / CLOCKS_PER_SEC;
  26.     printf("Parallel execution time with %d threads: %f seconds\n", num_threads, duration);
  27.     printf("Sum (Parallel): %d\n", sum);
  28. }
  29.  
  30. int main() {
  31.     // Calculate sequential execution time
  32.     sequential_execution();
  33.  
  34.     // Calculate parallel execution time with 2 threads
  35.     parallel_execution(4);
  36.  
  37.     return 0;
  38. }
  39.  
Success #stdin #stdout 0.01s 5284KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
Sequential execution time: 0.000607 seconds
Sum (Sequential): 1783293664
Parallel execution time with 4 threads: 0.000000 seconds
Sum (Parallel): 1783293664
https://ideone.com/zVYK4Z
language:
C (gcc 8.3)
created:
4 hours ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!