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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <string.h>
  4. #include <time.h>
  5.  
  6. int main() {
  7.     int buflen = 1 << 20;
  8.     char* buf = malloc(buflen);
  9.     FILE* pf = fopen("/dev/null", "w");
  10.     clock_t start;
  11.     int i;
  12.     unsigned long long int written = 0;
  13.     memset(buf, 0, buflen);
  14.     start = clock();
  15.     while (((float)(clock() - start)) / CLOCKS_PER_SEC < 0.95) {
  16.         for (i = 0; i < 1000; ++i) {
  17.             written += fwrite(buf, 1, buflen, pf);
  18.         }
  19.     }
  20.     fclose(pf);
  21.     free(buf);
  22.     printf("time taken: %fs, bytes written: %llu\n",
  23.         ((float)(clock() - start)) / CLOCKS_PER_SEC, written);
  24.     return 0;
  25. }
  26.  
Success #stdin #stdout 0.96s 1808KB
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Standard input is empty
stdout
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time taken: 0.950000s, bytes written: 1071644672000
https://ideone.com/lVD8wG
language:
C (gcc 8.3)
created:
12 years ago
visibility:
public

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