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115 lines
2.1 KiB
C
115 lines
2.1 KiB
C
/* ==== bench_pipe.c ============================================================
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* Copyright (c) 1993 by Chris Provenzano, proven@athena.mit.edu
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*
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* Description : Benchmark reads of /dev/null. Gives a good aprox. of
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* syscall times.
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*
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* 1.00 93/08/01 proven
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* -Started coding this file.
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*/
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#include <sys/types.h>
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#include <sys/time.h>
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#include <stdio.h>
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#include <fcntl.h>
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#include <errno.h>
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#define OK 0
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#define NOTOK -1
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/* ==========================================================================
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* usage();
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*/
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void usage(void)
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{
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printf("bench_pipe [-d?] [-c count]\n");
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errno = 0;
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}
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main(int argc, char **argv)
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{
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struct timeval starttime, endtime;
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char buf[1];
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int count = 1000;
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int debug = 0;
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int fd0[2];
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int fd1[2];
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int i;
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char word[256];
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/* Getopt variables. */
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extern int optind, opterr;
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extern char *optarg;
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while ((word[0] = getopt(argc, argv, "c:d?")) != (char)EOF) {
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switch (word[0]) {
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case 'd':
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debug++;
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break;
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case 'c':
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count = atoi(optarg);
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break;
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case '?':
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usage();
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return(OK);
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default:
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usage();
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return(NOTOK);
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}
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}
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if ((pipe(fd0) < OK) || (pipe(fd1) < OK)) {
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printf("Error: pipe\n");
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exit(0);
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}
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switch (fork()) {
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case NOTOK:
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printf("Error: fork\n");
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exit(0);
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case OK: /* Child */
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for (i = 0; i < count; i++) {
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if (read(fd1[0], buf, 1) < OK) {
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printf("Error: child read\n");
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exit(0);
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}
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if (write(fd0[1], buf, 1) < OK) {
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printf("Error: child write\n");
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exit(0);
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}
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}
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exit(0);
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break;
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default:
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break;
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}
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if (gettimeofday(&starttime, NULL)) {
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printf("Error: gettimeofday\n");
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exit(0);
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}
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count --;
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if (write(fd1[1], buf, 1) < OK) {
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perror("first parent write");
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exit(0);
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}
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for (i = 0; i < count; i++) {
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if (read(fd0[0], buf, 1) < OK) {
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printf("Error: parent read\n");
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exit(0);
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}
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if (write(fd1[1], buf, 1) < OK) {
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printf("Error: parent write\n");
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exit(0);
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}
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}
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if (gettimeofday(&endtime, NULL)) {
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printf("Error: gettimeofday\n");
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exit(0);
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}
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printf("%d ping pong tests took %d usecs.\n", count,
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(endtime.tv_sec - starttime.tv_sec) * 1000000 +
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(endtime.tv_usec - starttime.tv_usec));
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}
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