append16k.c

#define _GNU_SOURCE

#include<stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdlib.h>

int main ()
{
  FILE *fp;
  int fd;
  char *str;

  str = (char *) malloc(16384);
  memset(str,0,16384);

  fd = open( "/var/lib/mysql/append16kb.txt" , O_DIRECT | O_WRONLY | O_TRUNC);
  
  while (1)  {
     write(fd, str, 16384);
     fdatasync(fd);
  }

  close(fd);
 
  return(0);
}