Commit | Line | Data |
---|---|---|
c9fb4c5b JA |
1 | /* |
2 | * gcc -D_GNU_SOURCE -Wall -O2 -o aio-ring aio-ring.c -lpthread -laio | |
3 | */ | |
4 | #include <stdio.h> | |
5 | #include <errno.h> | |
6 | #include <assert.h> | |
7 | #include <stdlib.h> | |
8 | #include <stddef.h> | |
9 | #include <signal.h> | |
10 | #include <inttypes.h> | |
11 | ||
12 | #include <sys/types.h> | |
13 | #include <sys/stat.h> | |
14 | #include <sys/ioctl.h> | |
15 | #include <sys/syscall.h> | |
16 | #include <sys/resource.h> | |
17 | #include <linux/fs.h> | |
18 | #include <fcntl.h> | |
19 | #include <unistd.h> | |
20 | #include <libaio.h> | |
21 | #include <string.h> | |
22 | #include <pthread.h> | |
23 | #include <sched.h> | |
24 | ||
25 | #define IOCB_FLAG_HIPRI (1 << 2) | |
26 | ||
478a96a8 JA |
27 | #define IOCTX_FLAG_IOPOLL (1 << 0) |
28 | #define IOCTX_FLAG_SCQRING (1 << 1) /* Use SQ/CQ rings */ | |
c9fb4c5b | 29 | #define IOCTX_FLAG_FIXEDBUFS (1 << 2) |
478a96a8 JA |
30 | #define IOCTX_FLAG_SQTHREAD (1 << 3) /* Use SQ thread */ |
31 | #define IOCTX_FLAG_SQWQ (1 << 4) /* Use SQ wq */ | |
c9fb4c5b | 32 | |
305c06ce JA |
33 | #define IOEV_RES2_CACHEHIT (1 << 0) |
34 | ||
c9fb4c5b JA |
35 | #define barrier() __asm__ __volatile__("": : :"memory") |
36 | ||
37 | #define min(a, b) ((a < b) ? (a) : (b)) | |
38 | ||
fa3e6c25 | 39 | typedef uint64_t u64; |
c9fb4c5b | 40 | typedef uint32_t u32; |
478a96a8 | 41 | typedef uint16_t u16; |
c9fb4c5b | 42 | |
fa3e6c25 | 43 | struct aio_sq_ring { |
c9fb4c5b JA |
44 | union { |
45 | struct { | |
fa3e6c25 JA |
46 | u32 head; |
47 | u32 tail; | |
c9fb4c5b | 48 | u32 nr_events; |
478a96a8 | 49 | u16 sq_thread_cpu; |
fa3e6c25 | 50 | u64 iocbs; |
c9fb4c5b | 51 | }; |
fa3e6c25 | 52 | u32 pad[16]; |
c9fb4c5b | 53 | }; |
fa3e6c25 | 54 | u32 array[0]; |
c9fb4c5b JA |
55 | }; |
56 | ||
fa3e6c25 | 57 | struct aio_cq_ring { |
c9fb4c5b JA |
58 | union { |
59 | struct { | |
fa3e6c25 JA |
60 | u32 head; |
61 | u32 tail; | |
c9fb4c5b JA |
62 | u32 nr_events; |
63 | }; | |
fa3e6c25 | 64 | struct io_event pad; |
c9fb4c5b JA |
65 | }; |
66 | struct io_event events[0]; | |
67 | }; | |
68 | ||
69 | #define IORING_FLAG_SUBMIT (1 << 0) | |
70 | #define IORING_FLAG_GETEVENTS (1 << 1) | |
71 | ||
c9fb4c5b JA |
72 | #define DEPTH 32 |
73 | #define RING_SIZE (DEPTH + 1) | |
74 | ||
75 | #define BATCH_SUBMIT 8 | |
76 | #define BATCH_COMPLETE 8 | |
77 | ||
78 | #define BS 4096 | |
79 | ||
80 | struct submitter { | |
81 | pthread_t thread; | |
82 | unsigned long max_blocks; | |
83 | io_context_t ioc; | |
84 | struct drand48_data rand; | |
fa3e6c25 JA |
85 | struct aio_sq_ring *sq_ring; |
86 | struct iocb *iocbs; | |
87 | struct aio_cq_ring *cq_ring; | |
c9fb4c5b JA |
88 | int inflight; |
89 | unsigned long reaps; | |
90 | unsigned long done; | |
91 | unsigned long calls; | |
305c06ce | 92 | unsigned long cachehit, cachemiss; |
c9fb4c5b JA |
93 | volatile int finish; |
94 | char filename[128]; | |
95 | }; | |
96 | ||
97 | static struct submitter submitters[1]; | |
98 | static volatile int finish; | |
99 | ||
100 | static int polled = 1; /* use IO polling */ | |
101 | static int fixedbufs = 1; /* use fixed user buffers */ | |
102 | static int buffered = 0; /* use buffered IO, not O_DIRECT */ | |
0527b23f JA |
103 | static int sq_thread = 0; /* use kernel submission thread */ |
104 | static int sq_thread_cpu = 0; /* pin above thread to this CPU */ | |
c9fb4c5b JA |
105 | |
106 | static int io_setup2(unsigned int nr_events, unsigned int flags, | |
fa3e6c25 JA |
107 | struct aio_sq_ring *sq_ring, struct aio_cq_ring *cq_ring, |
108 | io_context_t *ctx_idp) | |
c9fb4c5b | 109 | { |
bf5dc389 | 110 | return syscall(335, nr_events, flags, sq_ring, cq_ring, ctx_idp); |
c9fb4c5b JA |
111 | } |
112 | ||
113 | static int io_ring_enter(io_context_t ctx, unsigned int to_submit, | |
114 | unsigned int min_complete, unsigned int flags) | |
115 | { | |
116 | return syscall(336, ctx, to_submit, min_complete, flags); | |
117 | } | |
118 | ||
119 | static int gettid(void) | |
120 | { | |
121 | return syscall(__NR_gettid); | |
122 | } | |
123 | ||
124 | static void init_io(struct submitter *s, int fd, struct iocb *iocb) | |
125 | { | |
126 | unsigned long offset; | |
127 | long r; | |
128 | ||
129 | lrand48_r(&s->rand, &r); | |
130 | offset = (r % (s->max_blocks - 1)) * BS; | |
131 | ||
132 | iocb->aio_fildes = fd; | |
133 | iocb->aio_lio_opcode = IO_CMD_PREAD; | |
134 | iocb->u.c.offset = offset; | |
135 | if (polled) | |
136 | iocb->u.c.flags = IOCB_FLAG_HIPRI; | |
137 | if (!fixedbufs) | |
138 | iocb->u.c.nbytes = BS; | |
139 | } | |
140 | ||
141 | static int prep_more_ios(struct submitter *s, int fd, int max_ios) | |
142 | { | |
fa3e6c25 | 143 | struct aio_sq_ring *ring = s->sq_ring; |
c9fb4c5b JA |
144 | u32 tail, next_tail, prepped = 0; |
145 | ||
146 | next_tail = tail = ring->tail; | |
147 | do { | |
148 | next_tail++; | |
149 | if (next_tail == ring->nr_events) | |
150 | next_tail = 0; | |
151 | ||
152 | barrier(); | |
153 | if (next_tail == ring->head) | |
154 | break; | |
155 | ||
fa3e6c25 JA |
156 | init_io(s, fd, &s->iocbs[tail]); |
157 | s->sq_ring->array[tail] = tail; | |
c9fb4c5b JA |
158 | prepped++; |
159 | tail = next_tail; | |
160 | } while (prepped < max_ios); | |
161 | ||
162 | if (ring->tail != tail) { | |
163 | /* order tail store with writes to iocbs above */ | |
164 | barrier(); | |
165 | ring->tail = tail; | |
166 | barrier(); | |
167 | } | |
168 | return prepped; | |
169 | } | |
170 | ||
171 | static int get_file_size(int fd, unsigned long *blocks) | |
172 | { | |
173 | struct stat st; | |
174 | ||
175 | if (fstat(fd, &st) < 0) | |
176 | return -1; | |
177 | if (S_ISBLK(st.st_mode)) { | |
178 | unsigned long long bytes; | |
179 | ||
180 | if (ioctl(fd, BLKGETSIZE64, &bytes) != 0) | |
181 | return -1; | |
182 | ||
183 | *blocks = bytes / BS; | |
184 | return 0; | |
185 | } else if (S_ISREG(st.st_mode)) { | |
186 | *blocks = st.st_size / BS; | |
187 | return 0; | |
188 | } | |
189 | ||
190 | return -1; | |
191 | } | |
192 | ||
193 | static int reap_events(struct submitter *s) | |
194 | { | |
fa3e6c25 | 195 | struct aio_cq_ring *ring = s->cq_ring; |
c9fb4c5b JA |
196 | struct io_event *ev; |
197 | u32 head, reaped = 0; | |
198 | ||
199 | head = ring->head; | |
200 | do { | |
201 | barrier(); | |
202 | if (head == ring->tail) | |
203 | break; | |
204 | ev = &ring->events[head]; | |
205 | if (ev->res != BS) { | |
fa3e6c25 | 206 | struct iocb *iocb = ev->obj; |
c9fb4c5b JA |
207 | |
208 | printf("io: unexpected ret=%ld\n", ev->res); | |
209 | printf("offset=%lu, size=%lu\n", (unsigned long) iocb->u.c.offset, (unsigned long) iocb->u.c.nbytes); | |
210 | return -1; | |
211 | } | |
305c06ce JA |
212 | if (ev->res2 & IOEV_RES2_CACHEHIT) |
213 | s->cachehit++; | |
214 | else | |
215 | s->cachemiss++; | |
c9fb4c5b JA |
216 | reaped++; |
217 | head++; | |
218 | if (head == ring->nr_events) | |
219 | head = 0; | |
220 | } while (1); | |
221 | ||
222 | s->inflight -= reaped; | |
223 | ring->head = head; | |
224 | barrier(); | |
225 | return reaped; | |
226 | } | |
227 | ||
228 | static void *submitter_fn(void *data) | |
229 | { | |
230 | struct submitter *s = data; | |
231 | int fd, ret, prepped, flags; | |
232 | ||
233 | printf("submitter=%d\n", gettid()); | |
234 | ||
235 | flags = O_RDONLY; | |
236 | if (!buffered) | |
237 | flags |= O_DIRECT; | |
238 | fd = open(s->filename, flags); | |
239 | if (fd < 0) { | |
240 | perror("open"); | |
241 | goto done; | |
242 | } | |
243 | ||
244 | if (get_file_size(fd, &s->max_blocks)) { | |
245 | printf("failed getting size of device/file\n"); | |
246 | goto err; | |
247 | } | |
248 | if (!s->max_blocks) { | |
249 | printf("Zero file/device size?\n"); | |
250 | goto err; | |
251 | } | |
252 | ||
253 | s->max_blocks--; | |
254 | ||
255 | srand48_r(pthread_self(), &s->rand); | |
256 | ||
257 | prepped = 0; | |
258 | do { | |
259 | int to_wait, flags, to_submit, this_reap; | |
260 | ||
261 | if (!prepped && s->inflight < DEPTH) | |
262 | prepped = prep_more_ios(s, fd, min(DEPTH - s->inflight, BATCH_SUBMIT)); | |
263 | s->inflight += prepped; | |
264 | submit_more: | |
265 | to_submit = prepped; | |
266 | submit: | |
267 | if (s->inflight + BATCH_SUBMIT < DEPTH) | |
268 | to_wait = 0; | |
269 | else | |
270 | to_wait = min(s->inflight + to_submit, BATCH_COMPLETE); | |
271 | ||
272 | flags = IORING_FLAG_GETEVENTS; | |
273 | if (to_submit) | |
274 | flags |= IORING_FLAG_SUBMIT; | |
275 | ||
276 | ret = io_ring_enter(s->ioc, to_submit, to_wait, flags); | |
277 | s->calls++; | |
278 | ||
279 | this_reap = reap_events(s); | |
280 | if (this_reap == -1) | |
281 | break; | |
282 | s->reaps += this_reap; | |
283 | ||
284 | if (ret >= 0) { | |
285 | if (!ret) { | |
286 | to_submit = 0; | |
287 | if (s->inflight) | |
288 | goto submit; | |
289 | continue; | |
290 | } else if (ret < to_submit) { | |
291 | int diff = to_submit - ret; | |
292 | ||
293 | s->done += ret; | |
294 | prepped -= diff; | |
295 | goto submit_more; | |
296 | } | |
297 | s->done += ret; | |
298 | prepped = 0; | |
299 | continue; | |
300 | } else if (ret < 0) { | |
301 | if ((ret == -1 && errno == EAGAIN) || ret == -EAGAIN) { | |
302 | if (s->finish) | |
303 | break; | |
304 | if (this_reap) | |
305 | goto submit; | |
c9fb4c5b JA |
306 | to_submit = 0; |
307 | goto submit; | |
308 | } | |
309 | if (ret == -1) | |
310 | printf("io_submit: %s\n", strerror(errno)); | |
311 | else | |
312 | printf("io_submit: %s\n", strerror(-ret)); | |
313 | break; | |
314 | } | |
315 | } while (!s->finish); | |
316 | err: | |
317 | close(fd); | |
318 | done: | |
319 | finish = 1; | |
320 | return NULL; | |
321 | } | |
322 | ||
323 | static void sig_int(int sig) | |
324 | { | |
325 | printf("Exiting on signal %d\n", sig); | |
326 | submitters[0].finish = 1; | |
327 | finish = 1; | |
328 | } | |
329 | ||
330 | static void arm_sig_int(void) | |
331 | { | |
332 | struct sigaction act; | |
333 | ||
334 | memset(&act, 0, sizeof(act)); | |
335 | act.sa_handler = sig_int; | |
336 | act.sa_flags = SA_RESTART; | |
337 | sigaction(SIGINT, &act, NULL); | |
338 | } | |
339 | ||
340 | int main(int argc, char *argv[]) | |
341 | { | |
342 | struct submitter *s = &submitters[0]; | |
305c06ce | 343 | unsigned long done, calls, reap, cache_hit, cache_miss; |
c9fb4c5b JA |
344 | int flags = 0, err; |
345 | int j; | |
346 | size_t size; | |
347 | void *p, *ret; | |
348 | struct rlimit rlim; | |
349 | ||
350 | if (argc < 2) { | |
351 | printf("%s: filename\n", argv[0]); | |
352 | return 1; | |
353 | } | |
354 | ||
355 | rlim.rlim_cur = RLIM_INFINITY; | |
356 | rlim.rlim_max = RLIM_INFINITY; | |
357 | if (setrlimit(RLIMIT_MEMLOCK, &rlim) < 0) { | |
358 | perror("setrlimit"); | |
359 | return 1; | |
360 | } | |
361 | ||
362 | arm_sig_int(); | |
363 | ||
fa3e6c25 JA |
364 | size = sizeof(struct iocb) * RING_SIZE; |
365 | if (posix_memalign(&p, 4096, size)) | |
366 | return 1; | |
367 | memset(p, 0, size); | |
368 | s->iocbs = p; | |
369 | ||
370 | size = sizeof(struct aio_sq_ring) + RING_SIZE * sizeof(u32); | |
c9fb4c5b JA |
371 | if (posix_memalign(&p, 4096, size)) |
372 | return 1; | |
373 | s->sq_ring = p; | |
374 | memset(p, 0, size); | |
0f75d092 | 375 | s->sq_ring->nr_events = RING_SIZE; |
fa3e6c25 | 376 | s->sq_ring->iocbs = (u64) s->iocbs; |
c9fb4c5b | 377 | |
478a96a8 | 378 | /* CQ ring must be twice as big */ |
fa3e6c25 | 379 | size = sizeof(struct aio_cq_ring) + |
478a96a8 | 380 | 2 * RING_SIZE * sizeof(struct io_event); |
c9fb4c5b JA |
381 | if (posix_memalign(&p, 4096, size)) |
382 | return 1; | |
383 | s->cq_ring = p; | |
384 | memset(p, 0, size); | |
0f75d092 | 385 | s->cq_ring->nr_events = 2 * RING_SIZE; |
c9fb4c5b JA |
386 | |
387 | for (j = 0; j < RING_SIZE; j++) { | |
fa3e6c25 | 388 | struct iocb *iocb = &s->iocbs[j]; |
c9fb4c5b JA |
389 | |
390 | if (posix_memalign(&iocb->u.c.buf, BS, BS)) { | |
391 | printf("failed alloc\n"); | |
392 | return 1; | |
393 | } | |
394 | iocb->u.c.nbytes = BS; | |
395 | } | |
396 | ||
397 | flags = IOCTX_FLAG_SCQRING; | |
398 | if (polled) | |
399 | flags |= IOCTX_FLAG_IOPOLL; | |
400 | if (fixedbufs) | |
401 | flags |= IOCTX_FLAG_FIXEDBUFS; | |
402 | if (buffered) | |
403 | flags |= IOCTX_FLAG_SQWQ; | |
404 | else if (sq_thread) { | |
405 | flags |= IOCTX_FLAG_SQTHREAD; | |
406 | s->sq_ring->sq_thread_cpu = sq_thread_cpu; | |
407 | } | |
408 | ||
bf5dc389 | 409 | err = io_setup2(RING_SIZE, flags, s->sq_ring, s->cq_ring, &s->ioc); |
c9fb4c5b JA |
410 | if (err) { |
411 | printf("ctx_init failed: %s, %d\n", strerror(errno), err); | |
412 | return 1; | |
413 | } | |
414 | printf("polled=%d, fixedbufs=%d, buffered=%d\n", polled, fixedbufs, buffered); | |
415 | printf(" QD=%d, sq_ring=%d, cq_ring=%d\n", DEPTH, s->sq_ring->nr_events, s->cq_ring->nr_events); | |
416 | strcpy(s->filename, argv[1]); | |
417 | ||
418 | pthread_create(&s->thread, NULL, submitter_fn, s); | |
419 | ||
305c06ce | 420 | cache_hit = cache_miss = reap = calls = done = 0; |
c9fb4c5b JA |
421 | do { |
422 | unsigned long this_done = 0; | |
423 | unsigned long this_reap = 0; | |
424 | unsigned long this_call = 0; | |
305c06ce JA |
425 | unsigned long this_cache_hit = 0; |
426 | unsigned long this_cache_miss = 0; | |
c9fb4c5b | 427 | unsigned long rpc = 0, ipc = 0; |
305c06ce | 428 | double hit = 0.0; |
c9fb4c5b JA |
429 | |
430 | sleep(1); | |
431 | this_done += s->done; | |
432 | this_call += s->calls; | |
433 | this_reap += s->reaps; | |
305c06ce JA |
434 | this_cache_hit += s->cachehit; |
435 | this_cache_miss += s->cachemiss; | |
436 | if (this_cache_hit && this_cache_miss) { | |
437 | unsigned long hits, total; | |
438 | ||
439 | hits = this_cache_hit - cache_hit; | |
440 | total = hits + this_cache_miss - cache_miss; | |
441 | hit = (double) hits / (double) total; | |
442 | hit *= 100.0; | |
443 | } | |
c9fb4c5b JA |
444 | if (this_call - calls) { |
445 | rpc = (this_done - done) / (this_call - calls); | |
446 | ipc = (this_reap - reap) / (this_call - calls); | |
447 | } | |
305c06ce | 448 | printf("IOPS=%lu, IOS/call=%lu/%lu, inflight=%u (head=%d tail=%d), Cachehit=%0.2f%%\n", |
c9fb4c5b | 449 | this_done - done, rpc, ipc, s->inflight, |
305c06ce | 450 | s->cq_ring->head, s->cq_ring->tail, hit); |
c9fb4c5b JA |
451 | done = this_done; |
452 | calls = this_call; | |
453 | reap = this_reap; | |
305c06ce JA |
454 | cache_hit = s->cachehit; |
455 | cache_miss = s->cachemiss; | |
c9fb4c5b JA |
456 | } while (!finish); |
457 | ||
458 | pthread_join(s->thread, &ret); | |
459 | return 0; | |
460 | } |