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> | |
c3e2fc25 | 17 | #include <sys/mman.h> |
c9fb4c5b JA |
18 | #include <linux/fs.h> |
19 | #include <fcntl.h> | |
20 | #include <unistd.h> | |
21 | #include <libaio.h> | |
22 | #include <string.h> | |
23 | #include <pthread.h> | |
24 | #include <sched.h> | |
25 | ||
c3e2fc25 JA |
26 | #define IOCTX_FLAG_SCQRING (1 << 0) /* Use SQ/CQ rings */ |
27 | #define IOCTX_FLAG_IOPOLL (1 << 1) | |
c9fb4c5b | 28 | #define IOCTX_FLAG_FIXEDBUFS (1 << 2) |
478a96a8 JA |
29 | #define IOCTX_FLAG_SQTHREAD (1 << 3) /* Use SQ thread */ |
30 | #define IOCTX_FLAG_SQWQ (1 << 4) /* Use SQ wq */ | |
c3e2fc25 | 31 | #define IOCTX_FLAG_SQPOLL (1 << 5) |
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 | |
c3e2fc25 JA |
43 | #define IORING_OFF_SQ_RING 0ULL |
44 | #define IORING_OFF_CQ_RING 0x8000000ULL | |
45 | #define IORING_OFF_IOCB 0x10000000ULL | |
46 | ||
47 | struct aio_uring_offsets { | |
48 | u32 head; | |
49 | u32 tail; | |
50 | u32 ring_mask; | |
51 | u32 ring_entries; | |
52 | u32 flags; | |
53 | u32 elems; | |
54 | }; | |
55 | ||
56 | struct aio_uring_params { | |
57 | u32 sq_entries; | |
58 | u32 cq_entries; | |
59 | u32 flags; | |
60 | u16 sq_thread_cpu; | |
61 | u16 resv[9]; | |
62 | struct aio_uring_offsets sq_off; | |
63 | struct aio_uring_offsets cq_off; | |
64 | }; | |
65 | ||
fa3e6c25 | 66 | struct aio_sq_ring { |
c3e2fc25 JA |
67 | u32 *head; |
68 | u32 *tail; | |
69 | u32 *ring_mask; | |
70 | u32 *ring_entries; | |
71 | u32 *array; | |
c9fb4c5b JA |
72 | }; |
73 | ||
fa3e6c25 | 74 | struct aio_cq_ring { |
c3e2fc25 JA |
75 | u32 *head; |
76 | u32 *tail; | |
77 | u32 *ring_mask; | |
78 | u32 *ring_entries; | |
79 | struct io_event *events; | |
c9fb4c5b JA |
80 | }; |
81 | ||
c3e2fc25 | 82 | #define IORING_ENTER_GETEVENTS (1 << 0) |
c9fb4c5b | 83 | |
c9fb4c5b | 84 | #define DEPTH 32 |
c9fb4c5b JA |
85 | |
86 | #define BATCH_SUBMIT 8 | |
87 | #define BATCH_COMPLETE 8 | |
88 | ||
89 | #define BS 4096 | |
90 | ||
c3e2fc25 | 91 | static unsigned sq_ring_mask, cq_ring_mask; |
e39c34dc | 92 | |
c9fb4c5b JA |
93 | struct submitter { |
94 | pthread_t thread; | |
95 | unsigned long max_blocks; | |
c3e2fc25 | 96 | int fd; |
c9fb4c5b | 97 | struct drand48_data rand; |
c3e2fc25 | 98 | struct aio_sq_ring sq_ring; |
fa3e6c25 | 99 | struct iocb *iocbs; |
c3e2fc25 JA |
100 | struct iovec iovecs[DEPTH]; |
101 | struct aio_cq_ring cq_ring; | |
c9fb4c5b JA |
102 | int inflight; |
103 | unsigned long reaps; | |
104 | unsigned long done; | |
105 | unsigned long calls; | |
305c06ce | 106 | unsigned long cachehit, cachemiss; |
c9fb4c5b JA |
107 | volatile int finish; |
108 | char filename[128]; | |
109 | }; | |
110 | ||
111 | static struct submitter submitters[1]; | |
112 | static volatile int finish; | |
113 | ||
c3e2fc25 JA |
114 | static int polled = 0; /* use IO polling */ |
115 | static int fixedbufs = 0; /* use fixed user buffers */ | |
116 | static int buffered = 1; /* use buffered IO, not O_DIRECT */ | |
0527b23f JA |
117 | static int sq_thread = 0; /* use kernel submission thread */ |
118 | static int sq_thread_cpu = 0; /* pin above thread to this CPU */ | |
c9fb4c5b | 119 | |
c3e2fc25 JA |
120 | static int io_uring_setup(unsigned entries, struct iovec *iovecs, |
121 | struct aio_uring_params *p) | |
c9fb4c5b | 122 | { |
c3e2fc25 | 123 | return syscall(335, entries, iovecs, p); |
c9fb4c5b JA |
124 | } |
125 | ||
c3e2fc25 JA |
126 | static int io_uring_enter(struct submitter *s, unsigned int to_submit, |
127 | unsigned int min_complete, unsigned int flags) | |
c9fb4c5b | 128 | { |
c3e2fc25 | 129 | return syscall(336, s->fd, to_submit, min_complete, flags); |
c9fb4c5b JA |
130 | } |
131 | ||
132 | static int gettid(void) | |
133 | { | |
134 | return syscall(__NR_gettid); | |
135 | } | |
136 | ||
c3e2fc25 | 137 | static void init_io(struct submitter *s, int fd, unsigned index) |
c9fb4c5b | 138 | { |
c3e2fc25 | 139 | struct iocb *iocb = &s->iocbs[index]; |
c9fb4c5b JA |
140 | unsigned long offset; |
141 | long r; | |
142 | ||
143 | lrand48_r(&s->rand, &r); | |
144 | offset = (r % (s->max_blocks - 1)) * BS; | |
145 | ||
146 | iocb->aio_fildes = fd; | |
147 | iocb->aio_lio_opcode = IO_CMD_PREAD; | |
c3e2fc25 JA |
148 | iocb->u.c.buf = s->iovecs[index].iov_base; |
149 | iocb->u.c.nbytes = BS; | |
c9fb4c5b | 150 | iocb->u.c.offset = offset; |
c9fb4c5b JA |
151 | } |
152 | ||
153 | static int prep_more_ios(struct submitter *s, int fd, int max_ios) | |
154 | { | |
c3e2fc25 | 155 | struct aio_sq_ring *ring = &s->sq_ring; |
e39c34dc | 156 | u32 index, tail, next_tail, prepped = 0; |
c9fb4c5b | 157 | |
c3e2fc25 | 158 | next_tail = tail = *ring->tail; |
c9fb4c5b JA |
159 | do { |
160 | next_tail++; | |
c9fb4c5b | 161 | barrier(); |
c3e2fc25 | 162 | if (next_tail == *ring->head) |
c9fb4c5b JA |
163 | break; |
164 | ||
e39c34dc | 165 | index = tail & sq_ring_mask; |
c3e2fc25 JA |
166 | init_io(s, fd, index); |
167 | ring->array[index] = index; | |
c9fb4c5b JA |
168 | prepped++; |
169 | tail = next_tail; | |
170 | } while (prepped < max_ios); | |
171 | ||
c3e2fc25 | 172 | if (*ring->tail != tail) { |
c9fb4c5b JA |
173 | /* order tail store with writes to iocbs above */ |
174 | barrier(); | |
c3e2fc25 | 175 | *ring->tail = tail; |
c9fb4c5b JA |
176 | barrier(); |
177 | } | |
178 | return prepped; | |
179 | } | |
180 | ||
181 | static int get_file_size(int fd, unsigned long *blocks) | |
182 | { | |
183 | struct stat st; | |
184 | ||
185 | if (fstat(fd, &st) < 0) | |
186 | return -1; | |
187 | if (S_ISBLK(st.st_mode)) { | |
188 | unsigned long long bytes; | |
189 | ||
190 | if (ioctl(fd, BLKGETSIZE64, &bytes) != 0) | |
191 | return -1; | |
192 | ||
193 | *blocks = bytes / BS; | |
194 | return 0; | |
195 | } else if (S_ISREG(st.st_mode)) { | |
196 | *blocks = st.st_size / BS; | |
197 | return 0; | |
198 | } | |
199 | ||
200 | return -1; | |
201 | } | |
202 | ||
203 | static int reap_events(struct submitter *s) | |
204 | { | |
c3e2fc25 | 205 | struct aio_cq_ring *ring = &s->cq_ring; |
c9fb4c5b JA |
206 | struct io_event *ev; |
207 | u32 head, reaped = 0; | |
208 | ||
c3e2fc25 | 209 | head = *ring->head; |
c9fb4c5b JA |
210 | do { |
211 | barrier(); | |
c3e2fc25 | 212 | if (head == *ring->tail) |
c9fb4c5b | 213 | break; |
e39c34dc | 214 | ev = &ring->events[head & cq_ring_mask]; |
c9fb4c5b | 215 | if (ev->res != BS) { |
fa3e6c25 | 216 | struct iocb *iocb = ev->obj; |
c9fb4c5b JA |
217 | |
218 | printf("io: unexpected ret=%ld\n", ev->res); | |
219 | printf("offset=%lu, size=%lu\n", (unsigned long) iocb->u.c.offset, (unsigned long) iocb->u.c.nbytes); | |
220 | return -1; | |
221 | } | |
305c06ce JA |
222 | if (ev->res2 & IOEV_RES2_CACHEHIT) |
223 | s->cachehit++; | |
224 | else | |
225 | s->cachemiss++; | |
c9fb4c5b JA |
226 | reaped++; |
227 | head++; | |
c9fb4c5b JA |
228 | } while (1); |
229 | ||
230 | s->inflight -= reaped; | |
c3e2fc25 | 231 | *ring->head = head; |
c9fb4c5b JA |
232 | barrier(); |
233 | return reaped; | |
234 | } | |
235 | ||
236 | static void *submitter_fn(void *data) | |
237 | { | |
238 | struct submitter *s = data; | |
239 | int fd, ret, prepped, flags; | |
240 | ||
241 | printf("submitter=%d\n", gettid()); | |
242 | ||
243 | flags = O_RDONLY; | |
244 | if (!buffered) | |
245 | flags |= O_DIRECT; | |
246 | fd = open(s->filename, flags); | |
247 | if (fd < 0) { | |
248 | perror("open"); | |
249 | goto done; | |
250 | } | |
251 | ||
252 | if (get_file_size(fd, &s->max_blocks)) { | |
253 | printf("failed getting size of device/file\n"); | |
254 | goto err; | |
255 | } | |
256 | if (!s->max_blocks) { | |
257 | printf("Zero file/device size?\n"); | |
258 | goto err; | |
259 | } | |
260 | ||
261 | s->max_blocks--; | |
262 | ||
263 | srand48_r(pthread_self(), &s->rand); | |
264 | ||
265 | prepped = 0; | |
266 | do { | |
605d3b6a | 267 | int to_wait, to_submit, this_reap; |
c9fb4c5b JA |
268 | |
269 | if (!prepped && s->inflight < DEPTH) | |
270 | prepped = prep_more_ios(s, fd, min(DEPTH - s->inflight, BATCH_SUBMIT)); | |
271 | s->inflight += prepped; | |
272 | submit_more: | |
273 | to_submit = prepped; | |
274 | submit: | |
275 | if (s->inflight + BATCH_SUBMIT < DEPTH) | |
276 | to_wait = 0; | |
277 | else | |
278 | to_wait = min(s->inflight + to_submit, BATCH_COMPLETE); | |
279 | ||
c3e2fc25 | 280 | ret = io_uring_enter(s, to_submit, to_wait, IORING_ENTER_GETEVENTS); |
c9fb4c5b JA |
281 | s->calls++; |
282 | ||
283 | this_reap = reap_events(s); | |
284 | if (this_reap == -1) | |
285 | break; | |
286 | s->reaps += this_reap; | |
287 | ||
288 | if (ret >= 0) { | |
289 | if (!ret) { | |
290 | to_submit = 0; | |
291 | if (s->inflight) | |
292 | goto submit; | |
293 | continue; | |
294 | } else if (ret < to_submit) { | |
295 | int diff = to_submit - ret; | |
296 | ||
297 | s->done += ret; | |
298 | prepped -= diff; | |
299 | goto submit_more; | |
300 | } | |
301 | s->done += ret; | |
302 | prepped = 0; | |
303 | continue; | |
304 | } else if (ret < 0) { | |
305 | if ((ret == -1 && errno == EAGAIN) || ret == -EAGAIN) { | |
306 | if (s->finish) | |
307 | break; | |
308 | if (this_reap) | |
309 | goto submit; | |
c9fb4c5b JA |
310 | to_submit = 0; |
311 | goto submit; | |
312 | } | |
313 | if (ret == -1) | |
314 | printf("io_submit: %s\n", strerror(errno)); | |
315 | else | |
316 | printf("io_submit: %s\n", strerror(-ret)); | |
317 | break; | |
318 | } | |
319 | } while (!s->finish); | |
320 | err: | |
321 | close(fd); | |
322 | done: | |
323 | finish = 1; | |
324 | return NULL; | |
325 | } | |
326 | ||
327 | static void sig_int(int sig) | |
328 | { | |
329 | printf("Exiting on signal %d\n", sig); | |
330 | submitters[0].finish = 1; | |
331 | finish = 1; | |
332 | } | |
333 | ||
334 | static void arm_sig_int(void) | |
335 | { | |
336 | struct sigaction act; | |
337 | ||
338 | memset(&act, 0, sizeof(act)); | |
339 | act.sa_handler = sig_int; | |
340 | act.sa_flags = SA_RESTART; | |
341 | sigaction(SIGINT, &act, NULL); | |
342 | } | |
343 | ||
c3e2fc25 JA |
344 | static int setup_ring(struct submitter *s) |
345 | { | |
346 | struct aio_sq_ring *sring = &s->sq_ring; | |
347 | struct aio_cq_ring *cring = &s->cq_ring; | |
348 | struct aio_uring_params p; | |
349 | void *ptr; | |
350 | int fd; | |
351 | ||
352 | memset(&p, 0, sizeof(p)); | |
353 | ||
354 | p.flags = IOCTX_FLAG_SCQRING; | |
355 | if (polled) | |
356 | p.flags |= IOCTX_FLAG_IOPOLL; | |
357 | if (fixedbufs) | |
358 | p.flags |= IOCTX_FLAG_FIXEDBUFS; | |
359 | if (buffered) | |
360 | p.flags |= IOCTX_FLAG_SQWQ; | |
361 | else if (sq_thread) { | |
362 | p.flags |= IOCTX_FLAG_SQTHREAD; | |
363 | p.sq_thread_cpu = sq_thread_cpu; | |
364 | } | |
365 | ||
366 | if (fixedbufs) | |
367 | fd = io_uring_setup(DEPTH, s->iovecs, &p); | |
368 | else | |
369 | fd = io_uring_setup(DEPTH, NULL, &p); | |
370 | if (fd < 0) { | |
371 | perror("io_uring_setup"); | |
372 | return 1; | |
373 | } | |
374 | ||
375 | s->fd = fd; | |
376 | ||
377 | ptr = mmap(0, p.sq_off.elems + p.sq_entries * sizeof(u32), | |
378 | PROT_READ | PROT_WRITE, MAP_SHARED | MAP_POPULATE, | |
379 | fd, IORING_OFF_SQ_RING); | |
380 | printf("sq_ring ptr = 0x%p\n", ptr); | |
381 | sring->head = ptr + p.sq_off.head; | |
382 | sring->tail = ptr + p.sq_off.tail; | |
383 | sring->ring_mask = ptr + p.sq_off.ring_mask; | |
384 | sring->ring_entries = ptr + p.sq_off.ring_entries; | |
385 | sring->array = ptr + p.sq_off.elems; | |
386 | sq_ring_mask = *sring->ring_mask; | |
387 | ||
388 | s->iocbs = mmap(0, p.sq_entries * sizeof(struct iocb), PROT_READ | PROT_WRITE, | |
389 | MAP_SHARED | MAP_POPULATE, fd, IORING_OFF_IOCB); | |
390 | printf("iocbs ptr = 0x%p\n", s->iocbs); | |
391 | ||
392 | ptr = mmap(0, p.cq_off.elems + p.cq_entries * sizeof(struct io_event), | |
393 | PROT_READ | PROT_WRITE, MAP_SHARED | MAP_POPULATE, | |
394 | fd, IORING_OFF_CQ_RING); | |
395 | printf("cq_ring ptr = 0x%p\n", ptr); | |
396 | cring->head = ptr + p.cq_off.head; | |
397 | cring->tail = ptr + p.cq_off.tail; | |
398 | cring->ring_mask = ptr + p.cq_off.ring_mask; | |
399 | cring->ring_entries = ptr + p.cq_off.ring_entries; | |
400 | cring->events = ptr + p.cq_off.elems; | |
401 | cq_ring_mask = *cring->ring_mask; | |
402 | return 0; | |
403 | } | |
404 | ||
c9fb4c5b JA |
405 | int main(int argc, char *argv[]) |
406 | { | |
407 | struct submitter *s = &submitters[0]; | |
305c06ce | 408 | unsigned long done, calls, reap, cache_hit, cache_miss; |
c3e2fc25 | 409 | int err, i; |
c9fb4c5b | 410 | struct rlimit rlim; |
c3e2fc25 | 411 | void *ret; |
c9fb4c5b JA |
412 | |
413 | if (argc < 2) { | |
414 | printf("%s: filename\n", argv[0]); | |
415 | return 1; | |
416 | } | |
417 | ||
418 | rlim.rlim_cur = RLIM_INFINITY; | |
419 | rlim.rlim_max = RLIM_INFINITY; | |
420 | if (setrlimit(RLIMIT_MEMLOCK, &rlim) < 0) { | |
421 | perror("setrlimit"); | |
422 | return 1; | |
423 | } | |
424 | ||
425 | arm_sig_int(); | |
426 | ||
c3e2fc25 JA |
427 | for (i = 0; i < DEPTH; i++) { |
428 | void *buf; | |
c9fb4c5b | 429 | |
c3e2fc25 | 430 | if (posix_memalign(&buf, BS, BS)) { |
c9fb4c5b JA |
431 | printf("failed alloc\n"); |
432 | return 1; | |
433 | } | |
c3e2fc25 JA |
434 | s->iovecs[i].iov_base = buf; |
435 | s->iovecs[i].iov_len = BS; | |
c9fb4c5b JA |
436 | } |
437 | ||
c3e2fc25 | 438 | err = setup_ring(s); |
c9fb4c5b | 439 | if (err) { |
c3e2fc25 | 440 | printf("ring setup failed: %s, %d\n", strerror(errno), err); |
c9fb4c5b JA |
441 | return 1; |
442 | } | |
c3e2fc25 JA |
443 | printf("polled=%d, fixedbufs=%d, buffered=%d", polled, fixedbufs, buffered); |
444 | printf(" QD=%d, sq_ring=%d, cq_ring=%d\n", DEPTH, *s->sq_ring.ring_entries, *s->cq_ring.ring_entries); | |
c9fb4c5b JA |
445 | strcpy(s->filename, argv[1]); |
446 | ||
447 | pthread_create(&s->thread, NULL, submitter_fn, s); | |
448 | ||
305c06ce | 449 | cache_hit = cache_miss = reap = calls = done = 0; |
c9fb4c5b JA |
450 | do { |
451 | unsigned long this_done = 0; | |
452 | unsigned long this_reap = 0; | |
453 | unsigned long this_call = 0; | |
305c06ce JA |
454 | unsigned long this_cache_hit = 0; |
455 | unsigned long this_cache_miss = 0; | |
c9fb4c5b | 456 | unsigned long rpc = 0, ipc = 0; |
305c06ce | 457 | double hit = 0.0; |
c9fb4c5b JA |
458 | |
459 | sleep(1); | |
460 | this_done += s->done; | |
461 | this_call += s->calls; | |
462 | this_reap += s->reaps; | |
305c06ce JA |
463 | this_cache_hit += s->cachehit; |
464 | this_cache_miss += s->cachemiss; | |
465 | if (this_cache_hit && this_cache_miss) { | |
466 | unsigned long hits, total; | |
467 | ||
468 | hits = this_cache_hit - cache_hit; | |
469 | total = hits + this_cache_miss - cache_miss; | |
470 | hit = (double) hits / (double) total; | |
471 | hit *= 100.0; | |
472 | } | |
c9fb4c5b JA |
473 | if (this_call - calls) { |
474 | rpc = (this_done - done) / (this_call - calls); | |
475 | ipc = (this_reap - reap) / (this_call - calls); | |
476 | } | |
10c4d131 | 477 | printf("IOPS=%lu, IOS/call=%lu/%lu, inflight=%u (head=%u tail=%u), Cachehit=%0.2f%%\n", |
c9fb4c5b | 478 | this_done - done, rpc, ipc, s->inflight, |
c3e2fc25 | 479 | *s->cq_ring.head, *s->cq_ring.tail, hit); |
c9fb4c5b JA |
480 | done = this_done; |
481 | calls = this_call; | |
482 | reap = this_reap; | |
305c06ce JA |
483 | cache_hit = s->cachehit; |
484 | cache_miss = s->cachemiss; | |
c9fb4c5b JA |
485 | } while (!finish); |
486 | ||
487 | pthread_join(s->thread, &ret); | |
488 | return 0; | |
489 | } |