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/*
* writetest --
*
* $Id: writetest.txt,v 10.3 1999/11/19 17:21:06 bostic Exp $
*/
#include <sys/types.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
void usage __P((void));
int
main(argc, argv)
int argc;
char *argv[];
{
struct timeval start_time, end_time;
long usecs;
int bytes, ch, cnt, fd, ops;
char *fname, buf[100 * 1024];
bytes = 256;
fname = "testfile";
ops = 1000;
while ((ch = getopt(argc, argv, "b:f:o:")) != EOF)
switch (ch) {
case 'b':
if ((bytes = atoi(optarg)) > sizeof(buf)) {
fprintf(stderr,
"max -b option %d\n", sizeof(buf));
exit (1);
}
break;
case 'f':
fname = optarg;
break;
case 'o':
if ((ops = atoi(optarg)) <= 0) {
fprintf(stderr, "illegal -o option value\n");
exit (1);
}
break;
case '?':
default:
usage();
}
argc -= optind;
argv += optind;
(void)unlink(fname);
if ((fd = open(fname, O_RDWR | O_CREAT, 0666)) == -1) {
perror(fname);
exit (1);
}
memset(buf, 0, bytes);
printf("running: %d ops\n", ops);
(void)gettimeofday(&start_time, NULL);
for (cnt = 0; cnt < ops; ++cnt) {
if (write(fd, buf, bytes) != bytes) {
fprintf(stderr, "write: %s\n", strerror(errno));
exit (1);
}
if (lseek(fd, (off_t)0, SEEK_SET) == -1) {
fprintf(stderr, "lseek: %s\n", strerror(errno));
exit (1);
}
if (fsync(fd) != 0) {
fprintf(stderr, "fsync: %s\n", strerror(errno));
exit (1);
}
}
(void)gettimeofday(&end_time, NULL);
usecs = (end_time.tv_sec - start_time.tv_sec) * 1000000 +
end_time.tv_usec - start_time.tv_usec;
printf("Elapsed time: %ld.%06ld seconds\n",
usecs / 1000000, usecs % 1000000);
printf("%d ops: %7.2f ops per second\n",
ops, (float)1000000 * ops/usecs);
(void)unlink(fname);
exit (0);
}
void
usage()
{
(void)fprintf(stderr,
"usage: testfile [-b bytes] [-f file] [-o ops]\n");
exit(1);
}
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