2 * Copyright (c) 2002 Adrian Chadd <adrian@FreeBSD.org>.
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
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39 #include <sys/cdefs.h>
40 __FBSDID("$FreeBSD$");
46 #include <sys/types.h>
49 #include <sys/ioctl.h>
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().
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.)
72 * Adrian Chadd <adrian@creative.net.au>
86 if (ioctl(fd, DIOCGMEDIASIZE, &mediasize) < 0) {
87 perror("ioctl(DIOCGMEDIASIZE)");
94 choose_aio(iot_t iomask)
96 /* choose a random read or write event, limited by the mask */
97 if (iomask == IOT_READ)
99 else if (iomask == IOT_WRITE)
101 return (random() & 0x01 ? IOT_READ : IOT_WRITE);
105 set_aio(struct aiocb *a, iot_t iot, int fd, off_t offset, int size, char *buf)
108 bzero(a, sizeof(*a));
110 a->aio_nbytes = size;
111 a->aio_offset = offset;
124 main(int argc, char *argv[])
133 off_t file_size, offset;
136 struct timeval st, et, rt;
142 printf("Usage: %s <file> <io size> <number of runs> <concurrency> <ro|wo|rw>\n", argv[0]);
147 io_size = atoi(argv[2]);
148 nrun = atoi(argv[3]);
149 aio_len = atoi(argv[4]);
150 if (strcmp(argv[5], "ro") == 0) {
152 } else if (strcmp(argv[5], "rw") == 0) {
153 iowhat = IOT_READ | IOT_WRITE;
154 } else if (strcmp(argv[5], "wo") == 0) {
157 fprintf(stderr, "needs to be ro, rw, wo!\n");
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.
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);
171 fd = open(fn, O_RDWR | O_DIRECT);
177 if (fstat(fd, &sb) < 0) {
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);
186 perror("unknown file type\n");
189 printf("File: %s; File size %qd bytes\n", fn, file_size);
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));
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);
202 set_aio(aio + i, choose_aio(iowhat), fd, offset, io_size, abuf[i]);
205 for (i = 0; i < nrun; i++) {
206 aio_waitcomplete(&a, NULL);
210 offset = random() % (file_size / io_size);
212 set_aio(aio + n, choose_aio(iowhat), fd, offset, io_size, abuf[n]);
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);