[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 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 IOEV_RES2_CACHEHIT	(1 << 0)

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

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

typedef uint64_t u64;
typedef uint32_t u32;
typedef uint16_t u16;

struct aio_sq_ring {
	union {
		struct {
			u32 head;
			u32 tail;
			u32 nr_events;
			u16 sq_thread_cpu;
			u64 iocbs;
		};
		u32 pad[16];
	};
	u32 array[0];
};

struct aio_cq_ring {
	union {
		struct {
			u32 head;
			u32 tail;
			u32 nr_events;
		};
		struct io_event pad;
	};
	struct io_event events[0];
};

#define IORING_FLAG_GETEVENTS	(1 << 0)

#define DEPTH			32

#define BATCH_SUBMIT		8
#define BATCH_COMPLETE		8

#define BS			4096

static unsigned sq_ring_mask = DEPTH - 1;
static unsigned cq_ring_mask = (2 * DEPTH) - 1;

struct submitter {
	pthread_t thread;
	unsigned long max_blocks;
	io_context_t ioc;
	struct drand48_data rand;
	struct aio_sq_ring *sq_ring;
	struct iocb *iocbs;
	struct aio_cq_ring *cq_ring;
	int inflight;
	unsigned long reaps;
	unsigned long done;
	unsigned long calls;
	unsigned long cachehit, cachemiss;
	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_sq_ring *sq_ring, struct aio_cq_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 (!fixedbufs)
		iocb->u.c.nbytes = BS;
}

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

	next_tail = tail = ring->tail;
	do {
		next_tail++;
		barrier();
		if (next_tail == ring->head)
			break;

		index = tail & sq_ring_mask;
		init_io(s, fd, &s->iocbs[index]);
		s->sq_ring->array[index] = index;
		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_cq_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 & cq_ring_mask];
		if (ev->res != BS) {
			struct iocb *iocb = ev->obj;

			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;
		}
		if (ev->res2 & IOEV_RES2_CACHEHIT)
			s->cachehit++;
		else
			s->cachemiss++;
		reaped++;
		head++;
	} 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, 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);

		ret = io_ring_enter(s->ioc, to_submit, to_wait,
					IORING_FLAG_GETEVENTS);
		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, cache_hit, cache_miss;
	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 iocb) * DEPTH;
	if (posix_memalign(&p, 4096, size))
		return 1;
	memset(p, 0, size);
	s->iocbs = p;

	size = sizeof(struct aio_sq_ring) + DEPTH * sizeof(u32);
	if (posix_memalign(&p, 4096, size))
		return 1;
	s->sq_ring = p;
	memset(p, 0, size);
	s->sq_ring->nr_events = DEPTH;
	s->sq_ring->iocbs = (u64) s->iocbs;

	/* CQ ring must be twice as big */
	size = sizeof(struct aio_cq_ring) +
			2 * DEPTH * 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 * DEPTH;

	for (j = 0; j < DEPTH; j++) {
		struct iocb *iocb = &s->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(DEPTH, 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);

	cache_hit = cache_miss = reap = calls = done = 0;
	do {
		unsigned long this_done = 0;
		unsigned long this_reap = 0;
		unsigned long this_call = 0;
		unsigned long this_cache_hit = 0;
		unsigned long this_cache_miss = 0;
		unsigned long rpc = 0, ipc = 0;
		double hit = 0.0;

		sleep(1);
		this_done += s->done;
		this_call += s->calls;
		this_reap += s->reaps;
		this_cache_hit += s->cachehit;
		this_cache_miss += s->cachemiss;
		if (this_cache_hit && this_cache_miss) {
			unsigned long hits, total;

			hits = this_cache_hit - cache_hit;
			total = hits + this_cache_miss - cache_miss;
			hit = (double) hits / (double) total;
			hit *= 100.0;
		}
		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=%u tail=%u), Cachehit=%0.2f%%\n",
				this_done - done, rpc, ipc, s->inflight,
				s->cq_ring->head, s->cq_ring->tail, hit);
		done = this_done;
		calls = this_call;
		reap = this_reap;
		cache_hit = s->cachehit;
		cache_miss = s->cachemiss;
	} while (!finish);

	pthread_join(s->thread, &ret);
	return 0;
}
Commit	Line	Data
	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 IOCTX_FLAG_IOPOLL (1 << 0)
	26	#define IOCTX_FLAG_SCQRING (1 << 1) /* Use SQ/CQ rings */
	27	#define IOCTX_FLAG_FIXEDBUFS (1 << 2)
	28	#define IOCTX_FLAG_SQTHREAD (1 << 3) /* Use SQ thread */
	29	#define IOCTX_FLAG_SQWQ (1 << 4) /* Use SQ wq */
	30
	31	#define IOEV_RES2_CACHEHIT (1 << 0)
	32
	33	#define barrier() __asm__ __volatile__("": : :"memory")
	34
	35	#define min(a, b) ((a < b) ? (a) : (b))
	36
	37	typedef uint64_t u64;
	38	typedef uint32_t u32;
	39	typedef uint16_t u16;
	40
	41	struct aio_sq_ring {
	42	union {
	43	struct {
	44	u32 head;
	45	u32 tail;
	46	u32 nr_events;
	47	u16 sq_thread_cpu;
	48	u64 iocbs;
	49	};
	50	u32 pad[16];
	51	};
	52	u32 array[0];
	53	};
	54
	55	struct aio_cq_ring {
	56	union {
	57	struct {
	58	u32 head;
	59	u32 tail;
	60	u32 nr_events;
	61	};
	62	struct io_event pad;
	63	};
	64	struct io_event events[0];
	65	};
	66
	67	#define IORING_FLAG_GETEVENTS (1 << 0)
	68
	69	#define DEPTH 32
	70
	71	#define BATCH_SUBMIT 8
	72	#define BATCH_COMPLETE 8
	73
	74	#define BS 4096
	75
	76	static unsigned sq_ring_mask = DEPTH - 1;
	77	static unsigned cq_ring_mask = (2 * DEPTH) - 1;
	78
	79	struct submitter {
	80	pthread_t thread;
	81	unsigned long max_blocks;
	82	io_context_t ioc;
	83	struct drand48_data rand;
	84	struct aio_sq_ring *sq_ring;
	85	struct iocb *iocbs;
	86	struct aio_cq_ring *cq_ring;
	87	int inflight;
	88	unsigned long reaps;
	89	unsigned long done;
	90	unsigned long calls;
	91	unsigned long cachehit, cachemiss;
	92	volatile int finish;
	93	char filename[128];
	94	};
	95
	96	static struct submitter submitters[1];
	97	static volatile int finish;
	98
	99	static int polled = 1; /* use IO polling */
	100	static int fixedbufs = 1; /* use fixed user buffers */
	101	static int buffered = 0; /* use buffered IO, not O_DIRECT */
	102	static int sq_thread = 0; /* use kernel submission thread */
	103	static int sq_thread_cpu = 0; /* pin above thread to this CPU */
	104
	105	static int io_setup2(unsigned int nr_events, unsigned int flags,
	106	struct aio_sq_ring sq_ring, struct aio_cq_ring cq_ring,
	107	io_context_t *ctx_idp)
	108	{
	109	return syscall(335, nr_events, flags, sq_ring, cq_ring, ctx_idp);
	110	}
	111
	112	static int io_ring_enter(io_context_t ctx, unsigned int to_submit,
	113	unsigned int min_complete, unsigned int flags)
	114	{
	115	return syscall(336, ctx, to_submit, min_complete, flags);
	116	}
	117
	118	static int gettid(void)
	119	{
	120	return syscall(__NR_gettid);
	121	}
	122
	123	static void init_io(struct submitter s, int fd, struct iocb iocb)
	124	{
	125	unsigned long offset;
	126	long r;
	127
	128	lrand48_r(&s->rand, &r);
	129	offset = (r % (s->max_blocks - 1)) * BS;
	130
	131	iocb->aio_fildes = fd;
	132	iocb->aio_lio_opcode = IO_CMD_PREAD;
	133	iocb->u.c.offset = offset;
	134	if (!fixedbufs)
	135	iocb->u.c.nbytes = BS;
	136	}
	137
	138	static int prep_more_ios(struct submitter *s, int fd, int max_ios)
	139	{
	140	struct aio_sq_ring *ring = s->sq_ring;
	141	u32 index, tail, next_tail, prepped = 0;
	142
	143	next_tail = tail = ring->tail;
	144	do {
	145	next_tail++;
	146	barrier();
	147	if (next_tail == ring->head)
	148	break;
	149
	150	index = tail & sq_ring_mask;
	151	init_io(s, fd, &s->iocbs[index]);
	152	s->sq_ring->array[index] = index;
	153	prepped++;
	154	tail = next_tail;
	155	} while (prepped < max_ios);
	156
	157	if (ring->tail != tail) {
	158	/* order tail store with writes to iocbs above */
	159	barrier();
	160	ring->tail = tail;
	161	barrier();
	162	}
	163	return prepped;
	164	}
	165
	166	static int get_file_size(int fd, unsigned long *blocks)
	167	{
	168	struct stat st;
	169
	170	if (fstat(fd, &st) < 0)
	171	return -1;
	172	if (S_ISBLK(st.st_mode)) {
	173	unsigned long long bytes;
	174
	175	if (ioctl(fd, BLKGETSIZE64, &bytes) != 0)
	176	return -1;
	177
	178	*blocks = bytes / BS;
	179	return 0;
	180	} else if (S_ISREG(st.st_mode)) {
	181	*blocks = st.st_size / BS;
	182	return 0;
	183	}
	184
	185	return -1;
	186	}
	187
	188	static int reap_events(struct submitter *s)
	189	{
	190	struct aio_cq_ring *ring = s->cq_ring;
	191	struct io_event *ev;
	192	u32 head, reaped = 0;
	193
	194	head = ring->head;
	195	do {
	196	barrier();
	197	if (head == ring->tail)
	198	break;
	199	ev = &ring->events[head & cq_ring_mask];
	200	if (ev->res != BS) {
	201	struct iocb *iocb = ev->obj;
	202
	203	printf("io: unexpected ret=%ld\n", ev->res);
	204	printf("offset=%lu, size=%lu\n", (unsigned long) iocb->u.c.offset, (unsigned long) iocb->u.c.nbytes);
	205	return -1;
	206	}
	207	if (ev->res2 & IOEV_RES2_CACHEHIT)
	208	s->cachehit++;
	209	else
	210	s->cachemiss++;
	211	reaped++;
	212	head++;
	213	} while (1);
	214
	215	s->inflight -= reaped;
	216	ring->head = head;
	217	barrier();
	218	return reaped;
	219	}
	220
	221	static void submitter_fn(void data)
	222	{
	223	struct submitter *s = data;
	224	int fd, ret, prepped, flags;
	225
	226	printf("submitter=%d\n", gettid());
	227
	228	flags = O_RDONLY;
	229	if (!buffered)
	230	flags \|= O_DIRECT;
	231	fd = open(s->filename, flags);
	232	if (fd < 0) {
	233	perror("open");
	234	goto done;
	235	}
	236
	237	if (get_file_size(fd, &s->max_blocks)) {
	238	printf("failed getting size of device/file\n");
	239	goto err;
	240	}
	241	if (!s->max_blocks) {
	242	printf("Zero file/device size?\n");
	243	goto err;
	244	}
	245
	246	s->max_blocks--;
	247
	248	srand48_r(pthread_self(), &s->rand);
	249
	250	prepped = 0;
	251	do {
	252	int to_wait, to_submit, this_reap;
	253
	254	if (!prepped && s->inflight < DEPTH)
	255	prepped = prep_more_ios(s, fd, min(DEPTH - s->inflight, BATCH_SUBMIT));
	256	s->inflight += prepped;
	257	submit_more:
	258	to_submit = prepped;
	259	submit:
	260	if (s->inflight + BATCH_SUBMIT < DEPTH)
	261	to_wait = 0;
	262	else
	263	to_wait = min(s->inflight + to_submit, BATCH_COMPLETE);
	264
	265	ret = io_ring_enter(s->ioc, to_submit, to_wait,
	266	IORING_FLAG_GETEVENTS);
	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;
	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, cache_hit, cache_miss;
	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 iocb) * DEPTH;
	355	if (posix_memalign(&p, 4096, size))
	356	return 1;
	357	memset(p, 0, size);
	358	s->iocbs = p;
	359
	360	size = sizeof(struct aio_sq_ring) + DEPTH * sizeof(u32);
	361	if (posix_memalign(&p, 4096, size))
	362	return 1;
	363	s->sq_ring = p;
	364	memset(p, 0, size);
	365	s->sq_ring->nr_events = DEPTH;
	366	s->sq_ring->iocbs = (u64) s->iocbs;
	367
	368	/* CQ ring must be twice as big */
	369	size = sizeof(struct aio_cq_ring) +
	370	2 * DEPTH * sizeof(struct io_event);
	371	if (posix_memalign(&p, 4096, size))
	372	return 1;
	373	s->cq_ring = p;
	374	memset(p, 0, size);
	375	s->cq_ring->nr_events = 2 * DEPTH;
	376
	377	for (j = 0; j < DEPTH; j++) {
	378	struct iocb *iocb = &s->iocbs[j];
	379
	380	if (posix_memalign(&iocb->u.c.buf, BS, BS)) {
	381	printf("failed alloc\n");
	382	return 1;
	383	}
	384	iocb->u.c.nbytes = BS;
	385	}
	386
	387	flags = IOCTX_FLAG_SCQRING;
	388	if (polled)
	389	flags \|= IOCTX_FLAG_IOPOLL;
	390	if (fixedbufs)
	391	flags \|= IOCTX_FLAG_FIXEDBUFS;
	392	if (buffered)
	393	flags \|= IOCTX_FLAG_SQWQ;
	394	else if (sq_thread) {
	395	flags \|= IOCTX_FLAG_SQTHREAD;
	396	s->sq_ring->sq_thread_cpu = sq_thread_cpu;
	397	}
	398
	399	err = io_setup2(DEPTH, flags, s->sq_ring, s->cq_ring, &s->ioc);
	400	if (err) {
	401	printf("ctx_init failed: %s, %d\n", strerror(errno), err);
	402	return 1;
	403	}
	404	printf("polled=%d, fixedbufs=%d, buffered=%d\n", polled, fixedbufs, buffered);
	405	printf(" QD=%d, sq_ring=%d, cq_ring=%d\n", DEPTH, s->sq_ring->nr_events, s->cq_ring->nr_events);
	406	strcpy(s->filename, argv[1]);
	407
	408	pthread_create(&s->thread, NULL, submitter_fn, s);
	409
	410	cache_hit = cache_miss = reap = calls = done = 0;
	411	do {
	412	unsigned long this_done = 0;
	413	unsigned long this_reap = 0;
	414	unsigned long this_call = 0;
	415	unsigned long this_cache_hit = 0;
	416	unsigned long this_cache_miss = 0;
	417	unsigned long rpc = 0, ipc = 0;
	418	double hit = 0.0;
	419
	420	sleep(1);
	421	this_done += s->done;
	422	this_call += s->calls;
	423	this_reap += s->reaps;
	424	this_cache_hit += s->cachehit;
	425	this_cache_miss += s->cachemiss;
	426	if (this_cache_hit && this_cache_miss) {
	427	unsigned long hits, total;
	428
	429	hits = this_cache_hit - cache_hit;
	430	total = hits + this_cache_miss - cache_miss;
	431	hit = (double) hits / (double) total;
	432	hit *= 100.0;
	433	}
	434	if (this_call - calls) {
	435	rpc = (this_done - done) / (this_call - calls);
	436	ipc = (this_reap - reap) / (this_call - calls);
	437	}
	438	printf("IOPS=%lu, IOS/call=%lu/%lu, inflight=%u (head=%u tail=%u), Cachehit=%0.2f%%\n",
	439	this_done - done, rpc, ipc, s->inflight,
	440	s->cq_ring->head, s->cq_ring->tail, hit);
	441	done = this_done;
	442	calls = this_call;
	443	reap = this_reap;
	444	cache_hit = s->cachehit;
	445	cache_miss = s->cachemiss;
	446	} while (!finish);
	447
	448	pthread_join(s->thread, &ret);
	449	return 0;
	450	}