Call Write API 1M Count

write_1m.cpp

#include <stdio.h>
#include <unistd.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>



main(){

struct timeval tv1, tv2;

gettimeofday(&tv1, NULL);

int fd = open("/dev/null", O_WRONLY);
char ch = 'H';
for(int i=0; i<8000000; i++){
    write(fd, &ch, 1);
}

gettimeofday(&tv2, NULL);


printf("total time = %d\n", (tv2.tv_sec-tv1.tv_sec)*1000000+(tv2.tv_usec-tv1.tv_usec));

}