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("$FreeBSD$");
42 #include <sys/types.h>
44 #include <sys/ioctl.h>
60 * This is a bit of a quick hack to do parallel IO testing through POSIX AIO.
61 * Its specifically designed to work under FreeBSD and its derivatives;
62 * note how I cheat by using aio_waitcomplete().
66 * + Add write support; so we can make sure we're not hitting throughput issues
67 * with read/modify/write of entire tracks of the disk
68 * + Add in per-op stats - time and offset - so one could start mapping out
69 * the speed hotspots of the disk
70 * + Add in different distributions - random, normal, left/right skewed normal,
71 * zipf, etc - and perhaps add the ability to run concurrent distributions
72 * (so a normal and a zipf; and also a random read; zipf write, etc.)
74 * Adrian Chadd <adrian@creative.net.au>
88 if (ioctl(fd, DIOCGMEDIASIZE, &mediasize) < 0)
89 err(1, "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;
118 err(1, "set_aio call failed");
122 main(int argc, char *argv[])
131 off_t file_size, offset;
134 struct timeval st, et, rt;
140 printf("Usage: %s <file> <io size> <number of runs> <concurrency> <ro|wo|rw>\n",
146 io_size = atoi(argv[2]);
148 errx(1, "the I/O size must be >0");
149 nrun = atoi(argv[3]);
151 errx(1, "the number of runs must be >0");
152 aio_len = atoi(argv[4]);
154 errx(1, "AIO concurrency must be >0");
155 if (strcmp(argv[5], "ro") == 0)
157 else if (strcmp(argv[5], "rw") == 0)
158 iowhat = IOT_READ | IOT_WRITE;
159 else if (strcmp(argv[5], "wo") == 0)
162 errx(1, "the I/O type needs to be \"ro\", \"rw\", or \"wo\"!\n");
165 * Random returns values between 0 and (2^32)-1; only good for 4 gig.
166 * Lets instead treat random() as returning a block offset w/ block size
167 * being "io_size", so we can handle > 4 gig files.
169 if (iowhat == IOT_READ)
170 fd = open(fn, O_RDONLY | O_DIRECT);
171 else if (iowhat == IOT_WRITE)
172 fd = open(fn, O_WRONLY | O_DIRECT);
174 fd = open(fn, O_RDWR | O_DIRECT);
177 err(1, "open failed");
178 if (fstat(fd, &sb) < 0)
179 err(1, "fstat failed");
180 if (S_ISREG(sb.st_mode)) {
181 file_size = sb.st_size;
182 } else if (S_ISBLK(sb.st_mode) || S_ISCHR(sb.st_mode)) {
183 file_size = disk_getsize(fd);
185 errx(1, "unknown file type");
187 errx(1, "path provided too small");
189 printf("File: %s; File size %jd bytes\n", fn, (intmax_t)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));
196 /* Fill with the initial contents */
197 gettimeofday(&st, NULL);
198 for (i = 0; i < aio_len; i++) {
199 offset = random() % (file_size / io_size);
201 set_aio(aio + i, choose_aio(iowhat), fd, offset, io_size, abuf[i]);
204 for (i = 0; i < nrun; i++) {
205 aio_waitcomplete(&a, NULL);
209 offset = random() % (file_size / io_size);
211 set_aio(aio + n, choose_aio(iowhat), fd, offset, io_size, abuf[n]);
214 gettimeofday(&et, NULL);
215 timersub(&et, &st, &rt);
216 f_rt = ((float) (rt.tv_usec)) / 1000000.0;
217 f_rt += (float) (rt.tv_sec);
218 printf("Runtime: %.2f seconds, ", f_rt);
219 printf("Op rate: %.2f ops/sec, ", ((float) (nrun)) / f_rt);
220 printf("Avg transfer rate: %.2f bytes/sec\n", ((float) (nrun)) * ((float)io_size) / f_rt);