1/*
2 * Copyright (c) 2002 Adrian Chadd <adrian@FreeBSD.org>.
3 * All rights reserved.
4 *
5 * This software was developed for the FreeBSD Project by Marshall
6 * Kirk McKusick and Network Associates Laboratories, the Security
7 * Research Division of Network Associates, Inc. under DARPA/SPAWAR
8 * contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA CHATS
9 * research program.
10 *
11 * Copyright (c) 1980, 1989, 1993
12 *	The Regents of the University of California.  All rights reserved.
13 *
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
16 * are met:
17 * 1. Redistributions of source code must retain the above copyright
18 *    notice, this list of conditions and the following disclaimer.
19 * 2. Redistributions in binary form must reproduce the above copyright
20 *    notice, this list of conditions and the following disclaimer in the
21 *    documentation and/or other materials provided with the distribution.
22 * 4. Neither the name of the University nor the names of its contributors
23 *    may be used to endorse or promote products derived from this software
24 *    without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 */
38
39#include <sys/cdefs.h>
40__FBSDID("$FreeBSD$");
41
42#include <stdio.h>
43#include <stdlib.h>
44#include <unistd.h>
45#include <sys/time.h>
46#include <sys/types.h>
47#include <sys/stat.h>
48#include <time.h>
49#include <sys/ioctl.h>
50#include <sys/disk.h>
51#include <aio.h>
52#include <fcntl.h>
53#include <string.h>
54#include <ctype.h>
55#include <assert.h>
56
57/*
58 * This is a bit of a quick hack to do parallel IO testing through POSIX AIO.
59 * Its specifically designed to work under FreeBSD and its derivatives;
60 * note how I cheat by using aio_waitcomplete().
61 *
62 * TODO:
63 *
64 * + Add write support; so we can make sure we're not hitting throughput issues
65 *   with read/modify/write of entire tracks of the disk
66 * + Add in per-op stats - time and offset - so one could start mapping out
67 *   the speed hotspots of the disk
68 * + Add in different distributions - random, normal, left/right skewed normal,
69 *   zipf, etc - and perhaps add the ability to run concurrent distributions
70 *   (so a normal and a zipf; and also a random read; zipf write, etc.)
71 *
72 * Adrian Chadd <adrian@creative.net.au>
73 */
74
75typedef enum {
76	IOT_NONE = 0x00,
77	IOT_READ = 0x01,
78	IOT_WRITE = 0x02
79} iot_t;
80
81static size_t
82disk_getsize(int fd)
83{
84	off_t mediasize;
85
86	if (ioctl(fd, DIOCGMEDIASIZE, &mediasize) < 0) {
87		perror("ioctl(DIOCGMEDIASIZE)");
88		exit(1);
89	}
90	return mediasize;
91}
92
93iot_t
94choose_aio(iot_t iomask)
95{
96	/* choose a random read or write event, limited by the mask */
97	if (iomask == IOT_READ)
98		return IOT_READ;
99	else if (iomask == IOT_WRITE)
100		return IOT_WRITE;
101	return (random() & 0x01 ? IOT_READ : IOT_WRITE);
102}
103
104void
105set_aio(struct aiocb *a, iot_t iot, int fd, off_t offset, int size, char *buf)
106{
107	int r;
108	bzero(a, sizeof(*a));
109	a->aio_fildes = fd;
110	a->aio_nbytes = size;
111	a->aio_offset = offset;
112	a->aio_buf = buf;
113	if (iot == IOT_READ)
114		r = aio_read(a);
115	else
116		r = aio_write(a);
117	if (r != 0) {
118		perror("set_aio");
119		exit(1);
120	}
121}
122
123int
124main(int argc, char *argv[])
125{
126	int fd;
127	struct stat sb;
128	struct aiocb *aio;
129	char **abuf;
130	const char *fn;
131	int aio_len;
132	int io_size, nrun;
133	off_t file_size, offset;
134	struct aiocb *a;
135	int i, n;
136        struct timeval st, et, rt;
137        float f_rt;
138	iot_t iowhat;
139
140
141	if (argc < 6) {
142		printf("Usage: %s <file> <io size> <number of runs> <concurrency> <ro|wo|rw>\n", argv[0]);
143		exit(1);
144	}
145
146	fn = argv[1];
147	io_size = atoi(argv[2]);
148	nrun = atoi(argv[3]);
149	aio_len = atoi(argv[4]);
150	if (strcmp(argv[5], "ro") == 0) {
151		iowhat = IOT_READ;
152	} else if (strcmp(argv[5], "rw") == 0) {
153		iowhat = IOT_READ | IOT_WRITE;
154	} else if (strcmp(argv[5], "wo") == 0) {
155		iowhat = IOT_WRITE;
156	} else {
157		fprintf(stderr, "needs to be ro, rw, wo!\n");
158		exit(1);
159	}
160
161	/*
162	 * Random returns values between 0 and (2^32)-1; only good for 4 gig.
163	 * Lets instead treat random() as returning a block offset w/ block size
164	 * being "io_size", so we can handle > 4 gig files.
165	 */
166	if (iowhat == IOT_READ)
167		fd = open(fn, O_RDONLY | O_DIRECT);
168	else if (iowhat == IOT_WRITE)
169		fd = open(fn, O_WRONLY | O_DIRECT);
170	else
171		fd = open(fn, O_RDWR | O_DIRECT);
172
173	if (fd < 0) {
174		perror("open");
175		exit(1);
176	}
177	if (fstat(fd, &sb) < 0) {
178		perror("fstat");
179		exit(1);
180	}
181	if (S_ISREG(sb.st_mode)) {
182		file_size = sb.st_size;
183	} else if (S_ISBLK(sb.st_mode) || S_ISCHR(sb.st_mode)) {
184		file_size = disk_getsize(fd);
185	} else {
186		perror("unknown file type\n");
187		exit(1);
188	}
189	printf("File: %s; File size %qd bytes\n", fn, file_size);
190
191	aio = calloc(aio_len, sizeof(struct aiocb));
192	abuf = calloc(aio_len, sizeof(char *));
193	for (i = 0; i < aio_len; i++) {
194		abuf[i] = calloc(1, io_size * sizeof(char));
195	}
196
197	/* Fill with the initial contents */
198        gettimeofday(&st, NULL);
199	for (i = 0; i < aio_len; i++) {
200                offset = random() % (file_size / io_size);
201                offset *= io_size;
202		set_aio(aio + i, choose_aio(iowhat), fd, offset, io_size, abuf[i]);
203	}
204
205	for (i = 0; i < nrun; i++) {
206		aio_waitcomplete(&a, NULL);
207		n = a - aio;
208		assert(n < aio_len);
209		assert(n >= 0);
210                offset = random() % (file_size / io_size);
211                offset *= io_size;
212		set_aio(aio + n, choose_aio(iowhat), fd, offset, io_size, abuf[n]);
213	}
214
215        gettimeofday(&et, NULL);
216        timersub(&et, &st, &rt);
217        f_rt = ((float) (rt.tv_usec)) / 1000000.0;
218        f_rt += (float) (rt.tv_sec);
219        printf("Runtime: %.2f seconds, ", f_rt);
220        printf("Op rate: %.2f ops/sec, ", ((float) (nrun))  / f_rt);
221        printf("Avg transfer rate: %.2f bytes/sec\n", ((float) (nrun)) * ((float)io_size) / f_rt);
222
223
224
225	exit(0);
226}
227