[fio.git] / steadystate.c

#include <stdlib.h>

#include "fio.h"
#include "steadystate.h"

bool steadystate_enabled = false;

void steadystate_free(struct thread_data *td)
{
	free(td->ss.iops_data);
	free(td->ss.bw_data);
	td->ss.iops_data = NULL;
	td->ss.bw_data = NULL;
}

static void steadystate_alloc(struct thread_data *td)
{
	td->ss.bw_data = calloc(td->ss.dur, sizeof(uint64_t));
	td->ss.iops_data = calloc(td->ss.dur, sizeof(uint64_t));

	td->ss.state |= FIO_SS_DATA;
}

void steadystate_setup(void)
{
	struct thread_data *td, *prev_td;
	int i, prev_groupid;

	if (!steadystate_enabled)
		return;

	/*
	 * if group reporting is enabled, identify the last td
	 * for each group and use it for storing steady state
	 * data
	 */
	prev_groupid = -1;
	prev_td = NULL;
	for_each_td(td, i) {
		if (!td->ss.dur)
			continue;

		if (!td->o.group_reporting) {
			steadystate_alloc(td);
			continue;
		}

		if (prev_groupid != td->groupid) {
			if (prev_td)
				steadystate_alloc(prev_td);
			prev_groupid = td->groupid;
		}
		prev_td = td;
	}

	if (prev_td && prev_td->o.group_reporting)
		steadystate_alloc(prev_td);
}

static bool steadystate_slope(uint64_t iops, uint64_t bw,
			      struct thread_data *td)
{
	int i, j;
	double result;
	struct steadystate_data *ss = &td->ss;
	uint64_t new_val;

	ss->bw_data[ss->tail] = bw;
	ss->iops_data[ss->tail] = iops;

	if (ss->state & FIO_SS_IOPS)
		new_val = iops;
	else
		new_val = bw;

	if (ss->state & FIO_SS_BUFFER_FULL || ss->tail - ss->head == ss->dur - 1) {
		if (!(ss->state & FIO_SS_BUFFER_FULL)) {
			/* first time through */
			for(i = 0, ss->sum_y = 0; i < ss->dur; i++) {
				if (ss->state & FIO_SS_IOPS)
					ss->sum_y += ss->iops_data[i];
				else
					ss->sum_y += ss->bw_data[i];
				j = (ss->head + i) % ss->dur;
				if (ss->state & FIO_SS_IOPS)
					ss->sum_xy += i * ss->iops_data[j];
				else
					ss->sum_xy += i * ss->bw_data[j];
			}
			ss->state |= FIO_SS_BUFFER_FULL;
		} else {		/* easy to update the sums */
			ss->sum_y -= ss->oldest_y;
			ss->sum_y += new_val;
			ss->sum_xy = ss->sum_xy - ss->sum_y + ss->dur * new_val;
		}

		if (ss->state & FIO_SS_IOPS)
			ss->oldest_y = ss->iops_data[ss->head];
		else
			ss->oldest_y = ss->bw_data[ss->head];

		/*
		 * calculate slope as (sum_xy - sum_x * sum_y / n) / (sum_(x^2)
		 * - (sum_x)^2 / n) This code assumes that all x values are
		 * equally spaced when they are often off by a few milliseconds.
		 * This assumption greatly simplifies the calculations.
		 */
		ss->slope = (ss->sum_xy - (double) ss->sum_x * ss->sum_y / ss->dur) /
				(ss->sum_x_sq - (double) ss->sum_x * ss->sum_x / ss->dur);
		if (ss->state & FIO_SS_PCT)
			ss->criterion = 100.0 * ss->slope / (ss->sum_y / ss->dur);
		else
			ss->criterion = ss->slope;

		dprint(FD_STEADYSTATE, "sum_y: %llu, sum_xy: %llu, slope: %f, "
					"criterion: %f, limit: %f\n",
					(unsigned long long) ss->sum_y,
					(unsigned long long) ss->sum_xy,
					ss->slope, ss->criterion, ss->limit);

		result = ss->criterion * (ss->criterion < 0.0 ? -1.0 : 1.0);
		if (result < ss->limit)
			return true;
	}

	ss->tail = (ss->tail + 1) % ss->dur;
	if (ss->tail <= ss->head)
		ss->head = (ss->head + 1) % ss->dur;

	return false;
}

static bool steadystate_deviation(uint64_t iops, uint64_t bw,
				  struct thread_data *td)
{
	int i;
	double diff;
	double mean;

	struct steadystate_data *ss = &td->ss;

	ss->bw_data[ss->tail] = bw;
	ss->iops_data[ss->tail] = iops;

	if (ss->state & FIO_SS_BUFFER_FULL || ss->tail - ss->head == ss->dur - 1) {
		if (!(ss->state & FIO_SS_BUFFER_FULL)) {
			/* first time through */
			for(i = 0, ss->sum_y = 0; i < ss->dur; i++)
				if (ss->state & FIO_SS_IOPS)
					ss->sum_y += ss->iops_data[i];
				else
					ss->sum_y += ss->bw_data[i];
			ss->state |= FIO_SS_BUFFER_FULL;
		} else {		/* easy to update the sum */
			ss->sum_y -= ss->oldest_y;
			if (ss->state & FIO_SS_IOPS)
				ss->sum_y += ss->iops_data[ss->tail];
			else
				ss->sum_y += ss->bw_data[ss->tail];
		}

		if (ss->state & FIO_SS_IOPS)
			ss->oldest_y = ss->iops_data[ss->head];
		else
			ss->oldest_y = ss->bw_data[ss->head];

		mean = (double) ss->sum_y / ss->dur;
		ss->deviation = 0.0;

		for (i = 0; i < ss->dur; i++) {
			if (ss->state & FIO_SS_IOPS)
				diff = ss->iops_data[i] - mean;
			else
				diff = ss->bw_data[i] - mean;
			ss->deviation = max(ss->deviation, diff * (diff < 0.0 ? -1.0 : 1.0));
		}

		if (ss->state & FIO_SS_PCT)
			ss->criterion = 100.0 * ss->deviation / mean;
		else
			ss->criterion = ss->deviation;

		dprint(FD_STEADYSTATE, "sum_y: %llu, mean: %f, max diff: %f, "
					"objective: %f, limit: %f\n",
					(unsigned long long) ss->sum_y, mean,
					ss->deviation, ss->criterion, ss->limit);

		if (ss->criterion < ss->limit)
			return true;
	}

	ss->tail = (ss->tail + 1) % ss->dur;
	if (ss->tail <= ss->head)
		ss->head = (ss->head + 1) % ss->dur;

	return false;
}

void steadystate_check(void)
{
	int i, j, ddir, prev_groupid, group_ramp_time_over = 0;
	unsigned long rate_time;
	struct thread_data *td, *td2;
	struct timespec now;
	uint64_t group_bw = 0, group_iops = 0;
	uint64_t td_iops, td_bytes;
	bool ret;

	prev_groupid = -1;
	for_each_td(td, i) {
		struct steadystate_data *ss = &td->ss;

		if (!ss->dur || td->runstate <= TD_SETTING_UP ||
		    td->runstate >= TD_EXITED || !ss->state ||
		    ss->state & FIO_SS_ATTAINED)
			continue;

		td_iops = 0;
		td_bytes = 0;
		if (!td->o.group_reporting ||
		    (td->o.group_reporting && td->groupid != prev_groupid)) {
			group_bw = 0;
			group_iops = 0;
			group_ramp_time_over = 0;
		}
		prev_groupid = td->groupid;

		fio_gettime(&now, NULL);
		if (ss->ramp_time && !(ss->state & FIO_SS_RAMP_OVER)) {
			/*
			 * Begin recording data one second after ss->ramp_time
			 * has elapsed
			 */
			if (utime_since(&td->epoch, &now) >= (ss->ramp_time + 1000000L))
				ss->state |= FIO_SS_RAMP_OVER;
		}

		td_io_u_lock(td);
		for (ddir = 0; ddir < DDIR_RWDIR_CNT; ddir++) {
			td_iops += td->io_blocks[ddir];
			td_bytes += td->io_bytes[ddir];
		}
		td_io_u_unlock(td);

		rate_time = mtime_since(&ss->prev_time, &now);
		memcpy(&ss->prev_time, &now, sizeof(now));

		/*
		 * Begin monitoring when job starts but don't actually use
		 * data in checking stopping criterion until ss->ramp_time is
		 * over. This ensures that we will have a sane value in
		 * prev_iops/bw the first time through after ss->ramp_time
		 * is done.
		 */
		if (ss->state & FIO_SS_RAMP_OVER) {
			group_bw += 1000 * (td_bytes - ss->prev_bytes) / rate_time;
			group_iops += 1000 * (td_iops - ss->prev_iops) / rate_time;
			++group_ramp_time_over;
		}
		ss->prev_iops = td_iops;
		ss->prev_bytes = td_bytes;

		if (td->o.group_reporting && !(ss->state & FIO_SS_DATA))
			continue;

		/*
		 * Don't begin checking criterion until ss->ramp_time is over
		 * for at least one thread in group
		 */
		if (!group_ramp_time_over)
			continue;

		dprint(FD_STEADYSTATE, "steadystate_check() thread: %d, "
					"groupid: %u, rate_msec: %ld, "
					"iops: %llu, bw: %llu, head: %d, tail: %d\n",
					i, td->groupid, rate_time,
					(unsigned long long) group_iops,
					(unsigned long long) group_bw,
					ss->head, ss->tail);

		if (ss->state & FIO_SS_SLOPE)
			ret = steadystate_slope(group_iops, group_bw, td);
		else
			ret = steadystate_deviation(group_iops, group_bw, td);

		if (ret) {
			if (td->o.group_reporting) {
				for_each_td(td2, j) {
					if (td2->groupid == td->groupid) {
						td2->ss.state |= FIO_SS_ATTAINED;
						fio_mark_td_terminate(td2);
					}
				}
			} else {
				ss->state |= FIO_SS_ATTAINED;
				fio_mark_td_terminate(td);
			}
		}
	}
}

int td_steadystate_init(struct thread_data *td)
{
	struct steadystate_data *ss = &td->ss;
	struct thread_options *o = &td->o;
	struct thread_data *td2;
	int j;

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

	if (o->ss_dur) {
		steadystate_enabled = true;
		o->ss_dur /= 1000000L;

		/* put all steady state info in one place */
		ss->dur = o->ss_dur;
		ss->limit = o->ss_limit.u.f;
		ss->ramp_time = o->ss_ramp_time;

		ss->state = o->ss_state;
		if (!td->ss.ramp_time)
			ss->state |= FIO_SS_RAMP_OVER;

		ss->sum_x = o->ss_dur * (o->ss_dur - 1) / 2;
		ss->sum_x_sq = (o->ss_dur - 1) * (o->ss_dur) * (2*o->ss_dur - 1) / 6;
	}

	/* make sure that ss options are consistent within reporting group */
	for_each_td(td2, j) {
		if (td2->groupid == td->groupid) {
			struct steadystate_data *ss2 = &td2->ss;

			if (ss2->dur != ss->dur ||
			    ss2->limit != ss->limit ||
			    ss2->ramp_time != ss->ramp_time ||
			    ss2->state != ss->state ||
			    ss2->sum_x != ss->sum_x ||
			    ss2->sum_x_sq != ss->sum_x_sq) {
				td_verror(td, EINVAL, "job rejected: steadystate options must be consistent within reporting groups");
				return 1;
			}
		}
	}

	return 0;
}

uint64_t steadystate_bw_mean(struct thread_stat *ts)
{
	int i;
	uint64_t sum;

	if (!ts->ss_dur)
		return 0;

	for (i = 0, sum = 0; i < ts->ss_dur; i++)
		sum += ts->ss_bw_data[i];

	return sum / ts->ss_dur;
}

uint64_t steadystate_iops_mean(struct thread_stat *ts)
{
	int i;
	uint64_t sum;

	if (!ts->ss_dur)
		return 0;

	for (i = 0, sum = 0; i < ts->ss_dur; i++)
		sum += ts->ss_iops_data[i];

	return sum / ts->ss_dur;
}
Commit	Line	Data
	1	#include <stdlib.h>
	2
	3	#include "fio.h"
	4	#include "steadystate.h"
	5
	6	bool steadystate_enabled = false;
	7
	8	void steadystate_free(struct thread_data *td)
	9	{
	10	free(td->ss.iops_data);
	11	free(td->ss.bw_data);
	12	td->ss.iops_data = NULL;
	13	td->ss.bw_data = NULL;
	14	}
	15
	16	static void steadystate_alloc(struct thread_data *td)
	17	{
	18	td->ss.bw_data = calloc(td->ss.dur, sizeof(uint64_t));
	19	td->ss.iops_data = calloc(td->ss.dur, sizeof(uint64_t));
	20
	21	td->ss.state \|= FIO_SS_DATA;
	22	}
	23
	24	void steadystate_setup(void)
	25	{
	26	struct thread_data td, prev_td;
	27	int i, prev_groupid;
	28
	29	if (!steadystate_enabled)
	30	return;
	31
	32	/*
	33	* if group reporting is enabled, identify the last td
	34	* for each group and use it for storing steady state
	35	* data
	36	*/
	37	prev_groupid = -1;
	38	prev_td = NULL;
	39	for_each_td(td, i) {
	40	if (!td->ss.dur)
	41	continue;
	42
	43	if (!td->o.group_reporting) {
	44	steadystate_alloc(td);
	45	continue;
	46	}
	47
	48	if (prev_groupid != td->groupid) {
	49	if (prev_td)
	50	steadystate_alloc(prev_td);
	51	prev_groupid = td->groupid;
	52	}
	53	prev_td = td;
	54	}
	55
	56	if (prev_td && prev_td->o.group_reporting)
	57	steadystate_alloc(prev_td);
	58	}
	59
	60	static bool steadystate_slope(uint64_t iops, uint64_t bw,
	61	struct thread_data *td)
	62	{
	63	int i, j;
	64	double result;
	65	struct steadystate_data *ss = &td->ss;
	66	uint64_t new_val;
	67
	68	ss->bw_data[ss->tail] = bw;
	69	ss->iops_data[ss->tail] = iops;
	70
	71	if (ss->state & FIO_SS_IOPS)
	72	new_val = iops;
	73	else
	74	new_val = bw;
	75
	76	if (ss->state & FIO_SS_BUFFER_FULL \|\| ss->tail - ss->head == ss->dur - 1) {
	77	if (!(ss->state & FIO_SS_BUFFER_FULL)) {
	78	/* first time through */
	79	for(i = 0, ss->sum_y = 0; i < ss->dur; i++) {
	80	if (ss->state & FIO_SS_IOPS)
	81	ss->sum_y += ss->iops_data[i];
	82	else
	83	ss->sum_y += ss->bw_data[i];
	84	j = (ss->head + i) % ss->dur;
	85	if (ss->state & FIO_SS_IOPS)
	86	ss->sum_xy += i * ss->iops_data[j];
	87	else
	88	ss->sum_xy += i * ss->bw_data[j];
	89	}
	90	ss->state \|= FIO_SS_BUFFER_FULL;
	91	} else { /* easy to update the sums */
	92	ss->sum_y -= ss->oldest_y;
	93	ss->sum_y += new_val;
	94	ss->sum_xy = ss->sum_xy - ss->sum_y + ss->dur * new_val;
	95	}
	96
	97	if (ss->state & FIO_SS_IOPS)
	98	ss->oldest_y = ss->iops_data[ss->head];
	99	else
	100	ss->oldest_y = ss->bw_data[ss->head];
	101
	102	/*
	103	* calculate slope as (sum_xy - sum_x * sum_y / n) / (sum_(x^2)
	104	* - (sum_x)^2 / n) This code assumes that all x values are
	105	* equally spaced when they are often off by a few milliseconds.
	106	* This assumption greatly simplifies the calculations.
	107	*/
	108	ss->slope = (ss->sum_xy - (double) ss->sum_x * ss->sum_y / ss->dur) /
	109	(ss->sum_x_sq - (double) ss->sum_x * ss->sum_x / ss->dur);
	110	if (ss->state & FIO_SS_PCT)
	111	ss->criterion = 100.0 * ss->slope / (ss->sum_y / ss->dur);
	112	else
	113	ss->criterion = ss->slope;
	114
	115	dprint(FD_STEADYSTATE, "sum_y: %llu, sum_xy: %llu, slope: %f, "
	116	"criterion: %f, limit: %f\n",
	117	(unsigned long long) ss->sum_y,
	118	(unsigned long long) ss->sum_xy,
	119	ss->slope, ss->criterion, ss->limit);
	120
	121	result = ss->criterion * (ss->criterion < 0.0 ? -1.0 : 1.0);
	122	if (result < ss->limit)
	123	return true;
	124	}
	125
	126	ss->tail = (ss->tail + 1) % ss->dur;
	127	if (ss->tail <= ss->head)
	128	ss->head = (ss->head + 1) % ss->dur;
	129
	130	return false;
	131	}
	132
	133	static bool steadystate_deviation(uint64_t iops, uint64_t bw,
	134	struct thread_data *td)
	135	{
	136	int i;
	137	double diff;
	138	double mean;
	139
	140	struct steadystate_data *ss = &td->ss;
	141
	142	ss->bw_data[ss->tail] = bw;
	143	ss->iops_data[ss->tail] = iops;
	144
	145	if (ss->state & FIO_SS_BUFFER_FULL \|\| ss->tail - ss->head == ss->dur - 1) {
	146	if (!(ss->state & FIO_SS_BUFFER_FULL)) {
	147	/* first time through */
	148	for(i = 0, ss->sum_y = 0; i < ss->dur; i++)
	149	if (ss->state & FIO_SS_IOPS)
	150	ss->sum_y += ss->iops_data[i];
	151	else
	152	ss->sum_y += ss->bw_data[i];
	153	ss->state \|= FIO_SS_BUFFER_FULL;
	154	} else { /* easy to update the sum */
	155	ss->sum_y -= ss->oldest_y;
	156	if (ss->state & FIO_SS_IOPS)
	157	ss->sum_y += ss->iops_data[ss->tail];
	158	else
	159	ss->sum_y += ss->bw_data[ss->tail];
	160	}
	161
	162	if (ss->state & FIO_SS_IOPS)
	163	ss->oldest_y = ss->iops_data[ss->head];
	164	else
	165	ss->oldest_y = ss->bw_data[ss->head];
	166
	167	mean = (double) ss->sum_y / ss->dur;
	168	ss->deviation = 0.0;
	169
	170	for (i = 0; i < ss->dur; i++) {
	171	if (ss->state & FIO_SS_IOPS)
	172	diff = ss->iops_data[i] - mean;
	173	else
	174	diff = ss->bw_data[i] - mean;
	175	ss->deviation = max(ss->deviation, diff * (diff < 0.0 ? -1.0 : 1.0));
	176	}
	177
	178	if (ss->state & FIO_SS_PCT)
	179	ss->criterion = 100.0 * ss->deviation / mean;
	180	else
	181	ss->criterion = ss->deviation;
	182
	183	dprint(FD_STEADYSTATE, "sum_y: %llu, mean: %f, max diff: %f, "
	184	"objective: %f, limit: %f\n",
	185	(unsigned long long) ss->sum_y, mean,
	186	ss->deviation, ss->criterion, ss->limit);
	187
	188	if (ss->criterion < ss->limit)
	189	return true;
	190	}
	191
	192	ss->tail = (ss->tail + 1) % ss->dur;
	193	if (ss->tail <= ss->head)
	194	ss->head = (ss->head + 1) % ss->dur;
	195
	196	return false;
	197	}
	198
	199	void steadystate_check(void)
	200	{
	201	int i, j, ddir, prev_groupid, group_ramp_time_over = 0;
	202	unsigned long rate_time;
	203	struct thread_data td, td2;
	204	struct timespec now;
	205	uint64_t group_bw = 0, group_iops = 0;
	206	uint64_t td_iops, td_bytes;
	207	bool ret;
	208
	209	prev_groupid = -1;
	210	for_each_td(td, i) {
	211	struct steadystate_data *ss = &td->ss;
	212
	213	if (!ss->dur \|\| td->runstate <= TD_SETTING_UP \|\|
	214	td->runstate >= TD_EXITED \|\| !ss->state \|\|
	215	ss->state & FIO_SS_ATTAINED)
	216	continue;
	217
	218	td_iops = 0;
	219	td_bytes = 0;
	220	if (!td->o.group_reporting \|\|
	221	(td->o.group_reporting && td->groupid != prev_groupid)) {
	222	group_bw = 0;
	223	group_iops = 0;
	224	group_ramp_time_over = 0;
	225	}
	226	prev_groupid = td->groupid;
	227
	228	fio_gettime(&now, NULL);
	229	if (ss->ramp_time && !(ss->state & FIO_SS_RAMP_OVER)) {
	230	/*
	231	* Begin recording data one second after ss->ramp_time
	232	* has elapsed
	233	*/
	234	if (utime_since(&td->epoch, &now) >= (ss->ramp_time + 1000000L))
	235	ss->state \|= FIO_SS_RAMP_OVER;
	236	}
	237
	238	td_io_u_lock(td);
	239	for (ddir = 0; ddir < DDIR_RWDIR_CNT; ddir++) {
	240	td_iops += td->io_blocks[ddir];
	241	td_bytes += td->io_bytes[ddir];
	242	}
	243	td_io_u_unlock(td);
	244
	245	rate_time = mtime_since(&ss->prev_time, &now);
	246	memcpy(&ss->prev_time, &now, sizeof(now));
	247
	248	/*
	249	* Begin monitoring when job starts but don't actually use
	250	* data in checking stopping criterion until ss->ramp_time is
	251	* over. This ensures that we will have a sane value in
	252	* prev_iops/bw the first time through after ss->ramp_time
	253	* is done.
	254	*/
	255	if (ss->state & FIO_SS_RAMP_OVER) {
	256	group_bw += 1000 * (td_bytes - ss->prev_bytes) / rate_time;
	257	group_iops += 1000 * (td_iops - ss->prev_iops) / rate_time;
	258	++group_ramp_time_over;
	259	}
	260	ss->prev_iops = td_iops;
	261	ss->prev_bytes = td_bytes;
	262
	263	if (td->o.group_reporting && !(ss->state & FIO_SS_DATA))
	264	continue;
	265
	266	/*
	267	* Don't begin checking criterion until ss->ramp_time is over
	268	* for at least one thread in group
	269	*/
	270	if (!group_ramp_time_over)
	271	continue;
	272
	273	dprint(FD_STEADYSTATE, "steadystate_check() thread: %d, "
	274	"groupid: %u, rate_msec: %ld, "
	275	"iops: %llu, bw: %llu, head: %d, tail: %d\n",
	276	i, td->groupid, rate_time,
	277	(unsigned long long) group_iops,
	278	(unsigned long long) group_bw,
	279	ss->head, ss->tail);
	280
	281	if (ss->state & FIO_SS_SLOPE)
	282	ret = steadystate_slope(group_iops, group_bw, td);
	283	else
	284	ret = steadystate_deviation(group_iops, group_bw, td);
	285
	286	if (ret) {
	287	if (td->o.group_reporting) {
	288	for_each_td(td2, j) {
	289	if (td2->groupid == td->groupid) {
	290	td2->ss.state \|= FIO_SS_ATTAINED;
	291	fio_mark_td_terminate(td2);
	292	}
	293	}
	294	} else {
	295	ss->state \|= FIO_SS_ATTAINED;
	296	fio_mark_td_terminate(td);
	297	}
	298	}
	299	}
	300	}
	301
	302	int td_steadystate_init(struct thread_data *td)
	303	{
	304	struct steadystate_data *ss = &td->ss;
	305	struct thread_options *o = &td->o;
	306	struct thread_data *td2;
	307	int j;
	308
	309	memset(ss, 0, sizeof(*ss));
	310
	311	if (o->ss_dur) {
	312	steadystate_enabled = true;
	313	o->ss_dur /= 1000000L;
	314
	315	/* put all steady state info in one place */
	316	ss->dur = o->ss_dur;
	317	ss->limit = o->ss_limit.u.f;
	318	ss->ramp_time = o->ss_ramp_time;
	319
	320	ss->state = o->ss_state;
	321	if (!td->ss.ramp_time)
	322	ss->state \|= FIO_SS_RAMP_OVER;
	323
	324	ss->sum_x = o->ss_dur * (o->ss_dur - 1) / 2;
	325	ss->sum_x_sq = (o->ss_dur - 1) * (o->ss_dur) * (2*o->ss_dur - 1) / 6;
	326	}
	327
	328	/* make sure that ss options are consistent within reporting group */
	329	for_each_td(td2, j) {
	330	if (td2->groupid == td->groupid) {
	331	struct steadystate_data *ss2 = &td2->ss;
	332
	333	if (ss2->dur != ss->dur \|\|
	334	ss2->limit != ss->limit \|\|
	335	ss2->ramp_time != ss->ramp_time \|\|
	336	ss2->state != ss->state \|\|
	337	ss2->sum_x != ss->sum_x \|\|
	338	ss2->sum_x_sq != ss->sum_x_sq) {
	339	td_verror(td, EINVAL, "job rejected: steadystate options must be consistent within reporting groups");
	340	return 1;
	341	}
	342	}
	343	}
	344
	345	return 0;
	346	}
	347
	348	uint64_t steadystate_bw_mean(struct thread_stat *ts)
	349	{
	350	int i;
	351	uint64_t sum;
	352
	353	if (!ts->ss_dur)
	354	return 0;
	355
	356	for (i = 0, sum = 0; i < ts->ss_dur; i++)
	357	sum += ts->ss_bw_data[i];
	358
	359	return sum / ts->ss_dur;
	360	}
	361
	362	uint64_t steadystate_iops_mean(struct thread_stat *ts)
	363	{
	364	int i;
	365	uint64_t sum;
	366
	367	if (!ts->ss_dur)
	368	return 0;
	369
	370	for (i = 0, sum = 0; i < ts->ss_dur; i++)
	371	sum += ts->ss_iops_data[i];
	372
	373	return sum / ts->ss_dur;
	374	}