#include <unistd.h>
#include <fcntl.h>
#include <time.h>
#include <stdio.h>
int main(void)
{
 int val=0;
 int arr[1000000] = {0};
 int filedesc = open("/media/nvme/test.raw", O_WRONLY);
 clock_t t; 
 if (filedesc < 0) {
  return -1;
 }
 t = clock();
 while(val < 256)
 {
  write(filedesc, arr, sizeof(arr));
  val++;
 }
 t = clock() -t;
 double time_taken = ((double)t)/CLOCKS_PER_SEC;
  printf("fun() took %f seconds to execute \n", time_taken);
 close(filedesc);
     return 0;
}