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/* ==== p_bench_read.c ============================================================
* Copyright (c) 1993 by Chris Provenzano, proven@athena.mit.edu
*
* Description : Benchmark reads of /dev/null. Gives a good aprox. of
* syscall times.
*
* 1.00 93/08/01 proven
* -Started coding this file.
*/
#include <pthread.h>
#include <sys/types.h>
#include <sys/time.h>
#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
#define OK 0
#define NOTOK -1
/* ==========================================================================
* usage();
*/
void usage(void)
{
printf("p_bench_read [-d?] [-c count] [-s size] [-f file]\n");
errno = 0;
}
main(int argc, char **argv)
{
struct timeval starttime, endtime;
char *infile = "/dev/null";
int count = 1000000;
int debug = 0;
int size = 1;
int fd;
int i;
char word[16384], *word_ptr;
/* Getopt variables. */
extern int optind, opterr;
extern char *optarg;
pthread_init();
while ((word[0] = getopt(argc, argv, "c:df:s:?")) != (char)EOF) {
switch (word[0]) {
case 'c':
count = atoi(optarg);
break;
case 'd':
debug++;
break;
case 'f':
infile = optarg;
break;
case 's':
if ((size = atoi(optarg)) > 8192) {
size = 8192;
}
break;
case '?':
usage();
return(OK);
default:
usage();
return(NOTOK);
}
}
/* Align buffer boundary to a page boundary */
word_ptr = (char *)(((size_t) word + 4095) & ~4095);
if ((fd = open(infile, O_RDONLY)) < OK) {
perror ("open");
return 1;
}
if (gettimeofday(&starttime, NULL)) {
perror ("gettimeofday");
return 1;
}
for (i = 0; i < count; i++) {
if (read(fd, word_ptr, size) < OK) {
printf("Error: read\n");
exit(0);
}
}
if (gettimeofday(&endtime, NULL)) {
perror ("gettimeofday");
return 1;
}
printf("%d reads of %s took %d usecs.\n", count, infile,
(endtime.tv_sec - starttime.tv_sec) * 1000000 +
(endtime.tv_usec - starttime.tv_usec));
return 0;
}
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