[fio.git] / engines / null.c

/*
 * null engine
 *
 * IO engine that doesn't do any real IO transfers, it just pretends to.
 * The main purpose is to test fio itself.
 *
 */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <assert.h>

#include "../fio.h"
#include "../os.h"

struct null_data {
	struct io_u **io_us;
	int queued;
	int events;
};

static struct io_u *fio_null_event(struct thread_data *td, int event)
{
	struct null_data *nd = td->io_ops->data;

	return nd->io_us[event];
}

static int fio_null_getevents(struct thread_data *td, int min_events,
			      int fio_unused max, struct timespec fio_unused *t)
{
	struct null_data *nd = td->io_ops->data;
	int ret = 0;
	
	if (min_events) {
		ret = nd->events;
		nd->events = 0;
	}

	return ret;
}

static int fio_null_commit(struct thread_data *td)
{
	struct null_data *nd = td->io_ops->data;

	nd->events += nd->queued;
	nd->queued = 0;
	return 0;
}

static int fio_null_queue(struct thread_data fio_unused *td, struct io_u *io_u)
{
	struct null_data *nd = td->io_ops->data;

	if (td->io_ops->flags & FIO_SYNCIO)
		return FIO_Q_COMPLETED;

	nd->io_us[nd->queued++] = io_u;
	return FIO_Q_QUEUED;
}

static int fio_null_setup(struct thread_data *td)
{
	struct fio_file *f;
	unsigned int i;

	if (!td->o.size) {
		log_err("fio: need size= set\n");
		return 1;
	}

	td->io_size = td->o.size;
	td->total_io_size = td->io_size;

	for_each_file(td, f, i) {
		f->real_file_size = td->total_io_size / td->o.nr_files;
		f->file_size = f->real_file_size;
	}

	return 0;
}

static int fio_null_open(struct thread_data fio_unused *td,
			 struct fio_file fio_unused *f)
{
	f->fd = 0;
	return 0;
}

static void fio_null_cleanup(struct thread_data *td)
{
	struct null_data *nd = td->io_ops->data;

	if (nd) {
		if (nd->io_us)
			free(nd->io_us);
		free(nd);
		td->io_ops->data = NULL;
	}
}

static int fio_null_init(struct thread_data *td)
{
	struct null_data *nd = malloc(sizeof(*nd));

	memset(nd, 0, sizeof(*nd));

	if (td->o.iodepth != 1) {
		nd->io_us = malloc(td->o.iodepth * sizeof(struct io_u *));
		memset(nd->io_us, 0, td->o.iodepth * sizeof(struct io_u *));
	} else
		td->io_ops->flags |= FIO_SYNCIO;

	td->io_ops->data = nd;
	return 0;
}

static struct ioengine_ops ioengine = {
	.name		= "null",
	.version	= FIO_IOOPS_VERSION,
	.setup		= fio_null_setup,
	.queue		= fio_null_queue,
	.commit		= fio_null_commit,
	.getevents	= fio_null_getevents,
	.event		= fio_null_event,
	.init		= fio_null_init,
	.cleanup	= fio_null_cleanup,
	.open_file	= fio_null_open,
	.flags		= FIO_DISKLESSIO,
};

static void fio_init fio_null_register(void)
{
	register_ioengine(&ioengine);
}

static void fio_exit fio_null_unregister(void)
{
	unregister_ioengine(&ioengine);
}
Commit	Line	Data
a94ea28b	1	/*
da751ca9 JA	2	* null engine
	3	*
	4	* IO engine that doesn't do any real IO transfers, it just pretends to.
	5	* The main purpose is to test fio itself.
a94ea28b JA	6	*
	7	*/
	8	#include <stdio.h>
	9	#include <stdlib.h>
	10	#include <unistd.h>
	11	#include <errno.h>
	12	#include <assert.h>
	13
	14	#include "../fio.h"
	15	#include "../os.h"
	16
65afa5f2 JA	17	struct null_data {
	18	struct io_u **io_us;
	19	int queued;
	20	int events;
	21	};
	22
	23	static struct io_u fio_null_event(struct thread_data td, int event)
	24	{
	25	struct null_data *nd = td->io_ops->data;
	26
	27	return nd->io_us[event];
	28	}
	29
7401c088	30	static int fio_null_getevents(struct thread_data *td, int min_events,
65afa5f2 JA	31	int fio_unused max, struct timespec fio_unused *t)
	32	{
	33	struct null_data *nd = td->io_ops->data;
7401c088 JA	34	int ret = 0;
	35
	36	if (min_events) {
	37	ret = nd->events;
	38	nd->events = 0;
	39	}
65afa5f2	40
65afa5f2 JA	41	return ret;
	42	}
	43
	44	static int fio_null_commit(struct thread_data *td)
	45	{
	46	struct null_data *nd = td->io_ops->data;
	47
7401c088	48	nd->events += nd->queued;
65afa5f2 JA	49	nd->queued = 0;
	50	return 0;
	51	}
	52
36167d82	53	static int fio_null_queue(struct thread_data fio_unused td, struct io_u io_u)
a94ea28b	54	{
65afa5f2 JA	55	struct null_data *nd = td->io_ops->data;
	56
	57	if (td->io_ops->flags & FIO_SYNCIO)
	58	return FIO_Q_COMPLETED;
	59
	60	nd->io_us[nd->queued++] = io_u;
	61	return FIO_Q_QUEUED;
a94ea28b JA	62	}
a94ea28b JA	63
2fd233b7 JA	64	static int fio_null_setup(struct thread_data *td)
	65	{
	66	struct fio_file *f;
af52b345	67	unsigned int i;
2fd233b7	68
2dc1bbeb	69	if (!td->o.size) {
2fd233b7 JA	70	log_err("fio: need size= set\n");
	71	return 1;
	72	}
	73
2dc1bbeb	74	td->io_size = td->o.size;
2fd233b7 JA	75	td->total_io_size = td->io_size;
	76
	77	for_each_file(td, f, i) {
2dc1bbeb	78	f->real_file_size = td->total_io_size / td->o.nr_files;
2fd233b7 JA	79	f->file_size = f->real_file_size;
	80	}
	81
2fd233b7 JA	82	return 0;
	83	}
	84
b5af8293 JA	85	static int fio_null_open(struct thread_data fio_unused *td,
	86	struct fio_file fio_unused *f)
	87	{
640e9421	88	f->fd = 0;
b5af8293 JA	89	return 0;
	90	}
	91
65afa5f2 JA	92	static void fio_null_cleanup(struct thread_data *td)
	93	{
	94	struct null_data *nd = td->io_ops->data;
	95
	96	if (nd) {
	97	if (nd->io_us)
	98	free(nd->io_us);
	99	free(nd);
	100	td->io_ops->data = NULL;
	101	}
	102	}
	103
	104	static int fio_null_init(struct thread_data *td)
	105	{
	106	struct null_data nd = malloc(sizeof(nd));
	107
	108	memset(nd, 0, sizeof(*nd));
	109
2dc1bbeb JA	110	if (td->o.iodepth != 1) {
	111	nd->io_us = malloc(td->o.iodepth * sizeof(struct io_u *));
	112	memset(nd->io_us, 0, td->o.iodepth * sizeof(struct io_u *));
65afa5f2 JA	113	} else
	114	td->io_ops->flags \|= FIO_SYNCIO;
	115
	116	td->io_ops->data = nd;
	117	return 0;
	118	}
	119
a94ea28b JA	120	static struct ioengine_ops ioengine = {
	121	.name = "null",
	122	.version = FIO_IOOPS_VERSION,
2fd233b7	123	.setup = fio_null_setup,
a94ea28b	124	.queue = fio_null_queue,
65afa5f2 JA	125	.commit = fio_null_commit,
	126	.getevents = fio_null_getevents,
	127	.event = fio_null_event,
	128	.init = fio_null_init,
	129	.cleanup = fio_null_cleanup,
b5af8293	130	.open_file = fio_null_open,
65afa5f2	131	.flags = FIO_DISKLESSIO,
a94ea28b JA	132	};
	133
	134	static void fio_init fio_null_register(void)
	135	{
	136	register_ioengine(&ioengine);
	137	}
	138
	139	static void fio_exit fio_null_unregister(void)
	140	{
	141	unregister_ioengine(&ioengine);
	142	}