[fio.git] / t / aio-ring.c

/*
 * gcc -D_GNU_SOURCE -Wall -O2 -o aio-ring aio-ring.c  -lpthread -laio
 */
#include <stdio.h>
#include <errno.h>
#include <assert.h>
#include <stdlib.h>
#include <stddef.h>
#include <signal.h>
#include <inttypes.h>

#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/syscall.h>
#include <sys/resource.h>
#include <linux/fs.h>
#include <fcntl.h>
#include <unistd.h>
#include <libaio.h>
#include <string.h>
#include <pthread.h>
#include <sched.h>

#define IOCB_FLAG_HIPRI		(1 << 2)

#define IOCTX_FLAG_IOPOLL	(1 << 0)
#define IOCTX_FLAG_SCQRING	(1 << 1)	/* Use SQ/CQ rings */
#define IOCTX_FLAG_FIXEDBUFS	(1 << 2)
#define IOCTX_FLAG_SQTHREAD	(1 << 3)	/* Use SQ thread */
#define IOCTX_FLAG_SQWQ		(1 << 4)	/* Use SQ wq */

#define barrier()	__asm__ __volatile__("": : :"memory")

#define min(a, b)		((a < b) ? (a) : (b))

typedef uint32_t u32;
typedef uint16_t u16;

struct aio_iocb_ring {
	union {
		struct {
			u32 head, tail;
			u32 nr_events;
			u16 sq_thread_cpu;
		};
		struct iocb pad_iocb;
	};
	struct iocb iocbs[0];
};

struct aio_io_event_ring {
	union {
		struct {
			u32 head, tail;
			u32 nr_events;
		};
		struct io_event pad_event;
	};
	struct io_event events[0];
};

#define IORING_FLAG_SUBMIT	(1 << 0)
#define IORING_FLAG_GETEVENTS	(1 << 1)

#define DEPTH			32
#define RING_SIZE		(DEPTH + 1)

#define BATCH_SUBMIT		8
#define BATCH_COMPLETE		8

#define BS			4096

struct submitter {
	pthread_t thread;
	unsigned long max_blocks;
	io_context_t ioc;
	struct drand48_data rand;
	struct aio_iocb_ring *sq_ring;
	struct aio_io_event_ring *cq_ring;
	int inflight;
	unsigned long reaps;
	unsigned long done;
	unsigned long calls;
	volatile int finish;
	char filename[128];
};

static struct submitter submitters[1];
static volatile int finish;

static int polled = 1;		/* use IO polling */
static int fixedbufs = 1;	/* use fixed user buffers */
static int buffered = 0;	/* use buffered IO, not O_DIRECT */
static int sq_thread = 0;	/* use kernel submission thread */
static int sq_thread_cpu = 0;	/* pin above thread to this CPU */

static int io_setup2(unsigned int nr_events, unsigned int flags,
		     struct aio_iocb_ring *sq_ring,
		     struct aio_io_event_ring *cq_ring, io_context_t *ctx_idp)
{
	return syscall(335, nr_events, flags, sq_ring, cq_ring, ctx_idp);
}

static int io_ring_enter(io_context_t ctx, unsigned int to_submit,
			 unsigned int min_complete, unsigned int flags)
{
	return syscall(336, ctx, to_submit, min_complete, flags);
}

static int gettid(void)
{
	return syscall(__NR_gettid);
}

static void init_io(struct submitter *s, int fd, struct iocb *iocb)
{
	unsigned long offset;
	long r;

	lrand48_r(&s->rand, &r);
	offset = (r % (s->max_blocks - 1)) * BS;

	iocb->aio_fildes = fd;
	iocb->aio_lio_opcode = IO_CMD_PREAD;
	iocb->u.c.offset = offset;
	if (polled)
		iocb->u.c.flags = IOCB_FLAG_HIPRI;
	if (!fixedbufs)
		iocb->u.c.nbytes = BS;
}

static int prep_more_ios(struct submitter *s, int fd, int max_ios)
{
	struct aio_iocb_ring *ring = s->sq_ring;
	struct iocb *iocb;
	u32 tail, next_tail, prepped = 0;

	next_tail = tail = ring->tail;
	do {
		next_tail++;
		if (next_tail == ring->nr_events)
			next_tail = 0;

		barrier();
		if (next_tail == ring->head)
			break;

		iocb = &s->sq_ring->iocbs[tail];
		init_io(s, fd, iocb);
		prepped++;
		tail = next_tail;
	} while (prepped < max_ios);

	if (ring->tail != tail) {
		/* order tail store with writes to iocbs above */
		barrier();
		ring->tail = tail;
		barrier();
	}
	return prepped;
}

static int get_file_size(int fd, unsigned long *blocks)
{
	struct stat st;

	if (fstat(fd, &st) < 0)
		return -1;
	if (S_ISBLK(st.st_mode)) {
		unsigned long long bytes;

		if (ioctl(fd, BLKGETSIZE64, &bytes) != 0)
			return -1;

		*blocks = bytes / BS;
		return 0;
	} else if (S_ISREG(st.st_mode)) {
		*blocks = st.st_size / BS;
		return 0;
	}

	return -1;
}

static int reap_events(struct submitter *s)
{
	struct aio_io_event_ring *ring = s->cq_ring;
	struct io_event *ev;
	u32 head, reaped = 0;

	head = ring->head;
	do {
		barrier();
		if (head == ring->tail)
			break;
		ev = &ring->events[head];
		if (ev->res != BS) {
			int index = (int) (uintptr_t) ev->obj;
			struct iocb *iocb = &s->sq_ring->iocbs[index];

			printf("io: unexpected ret=%ld\n", ev->res);
			printf("offset=%lu, size=%lu\n", (unsigned long) iocb->u.c.offset, (unsigned long) iocb->u.c.nbytes);
			return -1;
		}
		reaped++;
		head++;
		if (head == ring->nr_events)
			head = 0;
	} while (1);

	s->inflight -= reaped;
	ring->head = head;
	barrier();
	return reaped;
}

static void *submitter_fn(void *data)
{
	struct submitter *s = data;
	int fd, ret, prepped, flags;

	printf("submitter=%d\n", gettid());

	flags = O_RDONLY;
	if (!buffered)
		flags |= O_DIRECT;
	fd = open(s->filename, flags);
	if (fd < 0) {
		perror("open");
		goto done;
	}

	if (get_file_size(fd, &s->max_blocks)) {
		printf("failed getting size of device/file\n");
		goto err;
	}
	if (!s->max_blocks) {
		printf("Zero file/device size?\n");
		goto err;
	}

	s->max_blocks--;

	srand48_r(pthread_self(), &s->rand);

	prepped = 0;
	do {
		int to_wait, flags, to_submit, this_reap;

		if (!prepped && s->inflight < DEPTH)
			prepped = prep_more_ios(s, fd, min(DEPTH - s->inflight, BATCH_SUBMIT));
		s->inflight += prepped;
submit_more:
		to_submit = prepped;
submit:
		if (s->inflight + BATCH_SUBMIT < DEPTH)
			to_wait = 0;
		else
			to_wait = min(s->inflight + to_submit, BATCH_COMPLETE);

		flags = IORING_FLAG_GETEVENTS;
		if (to_submit)
			flags |= IORING_FLAG_SUBMIT;

		ret = io_ring_enter(s->ioc, to_submit, to_wait, flags);
		s->calls++;

		this_reap = reap_events(s);
		if (this_reap == -1)
			break;
		s->reaps += this_reap;

		if (ret >= 0) {
			if (!ret) {
				to_submit = 0;
				if (s->inflight)
					goto submit;
				continue;
			} else if (ret < to_submit) {
				int diff = to_submit - ret;

				s->done += ret;
				prepped -= diff;
				goto submit_more;
			}
			s->done += ret;
			prepped = 0;
			continue;
		} else if (ret < 0) {
			if ((ret == -1 && errno == EAGAIN) || ret == -EAGAIN) {
				if (s->finish)
					break;
				if (this_reap)
					goto submit;
				to_submit = 0;
				goto submit;
			}
			if (ret == -1)
				printf("io_submit: %s\n", strerror(errno));
			else
				printf("io_submit: %s\n", strerror(-ret));
			break;
		}
	} while (!s->finish);
err:
	close(fd);
done:
	finish = 1;
	return NULL;
}

static void sig_int(int sig)
{
	printf("Exiting on signal %d\n", sig);
	submitters[0].finish = 1;
	finish = 1;
}

static void arm_sig_int(void)
{
	struct sigaction act;

	memset(&act, 0, sizeof(act));
	act.sa_handler = sig_int;
	act.sa_flags = SA_RESTART;
	sigaction(SIGINT, &act, NULL);
}

int main(int argc, char *argv[])
{
	struct submitter *s = &submitters[0];
	unsigned long done, calls, reap;
	int flags = 0, err;
	int j;
	size_t size;
	void *p, *ret;
	struct rlimit rlim;

	if (argc < 2) {
		printf("%s: filename\n", argv[0]);
		return 1;
	}

	rlim.rlim_cur = RLIM_INFINITY;
	rlim.rlim_max = RLIM_INFINITY;
	if (setrlimit(RLIMIT_MEMLOCK, &rlim) < 0) {
		perror("setrlimit");
		return 1;
	}

	arm_sig_int();

	size = sizeof(struct aio_iocb_ring) + RING_SIZE * sizeof(struct iocb);
	if (posix_memalign(&p, 4096, size))
		return 1;
	s->sq_ring = p;
	memset(p, 0, size);
	s->sq_ring->nr_events = RING_SIZE;

	/* CQ ring must be twice as big */
	size = sizeof(struct aio_io_event_ring) +
			2 * RING_SIZE * sizeof(struct io_event);
	if (posix_memalign(&p, 4096, size))
		return 1;
	s->cq_ring = p;
	memset(p, 0, size);
	s->cq_ring->nr_events = 2 * RING_SIZE;

	for (j = 0; j < RING_SIZE; j++) {
		struct iocb *iocb = &s->sq_ring->iocbs[j];

		if (posix_memalign(&iocb->u.c.buf, BS, BS)) {
			printf("failed alloc\n");
			return 1;
		}
		iocb->u.c.nbytes = BS;
	}

	flags = IOCTX_FLAG_SCQRING;
	if (polled)
		flags |= IOCTX_FLAG_IOPOLL;
	if (fixedbufs)
		flags |= IOCTX_FLAG_FIXEDBUFS;
	if (buffered)
		flags |= IOCTX_FLAG_SQWQ;
	else if (sq_thread) {
		flags |= IOCTX_FLAG_SQTHREAD;
		s->sq_ring->sq_thread_cpu = sq_thread_cpu;
	}

	err = io_setup2(RING_SIZE, flags, s->sq_ring, s->cq_ring, &s->ioc);
	if (err) {
		printf("ctx_init failed: %s, %d\n", strerror(errno), err);
		return 1;
	}
	printf("polled=%d, fixedbufs=%d, buffered=%d\n", polled, fixedbufs, buffered);
	printf("  QD=%d, sq_ring=%d, cq_ring=%d\n", DEPTH, s->sq_ring->nr_events, s->cq_ring->nr_events);
	strcpy(s->filename, argv[1]);

	pthread_create(&s->thread, NULL, submitter_fn, s);

	reap = calls = done = 0;
	do {
		unsigned long this_done = 0;
		unsigned long this_reap = 0;
		unsigned long this_call = 0;
		unsigned long rpc = 0, ipc = 0;

		sleep(1);
		this_done += s->done;
		this_call += s->calls;
		this_reap += s->reaps;
		if (this_call - calls) {
			rpc = (this_done - done) / (this_call - calls);
			ipc = (this_reap - reap) / (this_call - calls);
		}
		printf("IOPS=%lu, IOS/call=%lu/%lu, inflight=%u (head=%d tail=%d), %lu, %lu\n",
				this_done - done, rpc, ipc, s->inflight,
				s->cq_ring->head, s->cq_ring->tail, s->reaps, s->done);
		done = this_done;
		calls = this_call;
		reap = this_reap;
	} while (!finish);

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