#include "steadystate.h"
bool steadystate_enabled = false;
+unsigned int ss_check_interval = 1000;
void steadystate_free(struct thread_data *td)
{
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));
+ int intervals = td->ss.dur / (ss_check_interval / 1000L);
+
+ td->ss.bw_data = calloc(intervals, sizeof(uint64_t));
+ td->ss.iops_data = calloc(intervals, sizeof(uint64_t));
td->ss.state |= FIO_SS_DATA;
}
double result;
struct steadystate_data *ss = &td->ss;
uint64_t new_val;
+ int intervals = ss->dur / (ss_check_interval / 1000L);
ss->bw_data[ss->tail] = bw;
ss->iops_data[ss->tail] = 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 || ss->tail - ss->head == intervals - 1) {
if (!(ss->state & FIO_SS_BUFFER_FULL)) {
/* first time through */
- for(i = 0, ss->sum_y = 0; i < ss->dur; i++) {
+ for (i = 0, ss->sum_y = 0; i < intervals; 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;
+ j = (ss->head + i) % intervals;
if (ss->state & FIO_SS_IOPS)
ss->sum_xy += i * ss->iops_data[j];
else
} 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;
+ ss->sum_xy = ss->sum_xy - ss->sum_y + intervals * new_val;
}
if (ss->state & FIO_SS_IOPS)
* 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);
+ ss->slope = (ss->sum_xy - (double) ss->sum_x * ss->sum_y / intervals) /
+ (ss->sum_x_sq - (double) ss->sum_x * ss->sum_x / intervals);
if (ss->state & FIO_SS_PCT)
- ss->criterion = 100.0 * ss->slope / (ss->sum_y / ss->dur);
+ ss->criterion = 100.0 * ss->slope / (ss->sum_y / intervals);
else
ss->criterion = ss->slope;
return true;
}
- ss->tail = (ss->tail + 1) % ss->dur;
+ ss->tail = (ss->tail + 1) % intervals;
if (ss->tail <= ss->head)
- ss->head = (ss->head + 1) % ss->dur;
+ ss->head = (ss->head + 1) % intervals;
return false;
}
double mean;
struct steadystate_data *ss = &td->ss;
+ int intervals = ss->dur / (ss_check_interval / 1000L);
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 || ss->tail - ss->head == intervals - 1) {
if (!(ss->state & FIO_SS_BUFFER_FULL)) {
/* first time through */
- for(i = 0, ss->sum_y = 0; i < ss->dur; i++)
+ for (i = 0, ss->sum_y = 0; i < intervals; 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;
else
ss->oldest_y = ss->bw_data[ss->head];
- mean = (double) ss->sum_y / ss->dur;
+ mean = (double) ss->sum_y / intervals;
ss->deviation = 0.0;
- for (i = 0; i < ss->dur; i++) {
+ for (i = 0; i < intervals; i++) {
if (ss->state & FIO_SS_IOPS)
diff = ss->iops_data[i] - mean;
else
else
ss->criterion = ss->deviation;
- dprint(FD_STEADYSTATE, "sum_y: %llu, mean: %f, max diff: %f, "
+ dprint(FD_STEADYSTATE, "intervals: %d, sum_y: %llu, mean: %f, max diff: %f, "
"objective: %f, limit: %f\n",
+ intervals,
(unsigned long long) ss->sum_y, mean,
ss->deviation, 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;
+ ss->tail = (ss->tail + 1) % intervals;
+ if (ss->tail == ss->head)
+ ss->head = (ss->head + 1) % intervals;
return false;
}
fio_gettime(&now, NULL);
if (ss->ramp_time && !(ss->state & FIO_SS_RAMP_OVER)) {
/*
- * Begin recording data one second after ss->ramp_time
+ * Begin recording data one check interval after ss->ramp_time
* has elapsed
*/
- if (utime_since(&td->epoch, &now) >= (ss->ramp_time + 1000000L))
+ if (utime_since(&td->epoch, &now) >= (ss->ramp_time + ss_check_interval * 1000L))
ss->state |= FIO_SS_RAMP_OVER;
}
memcpy(&ss->prev_time, &now, sizeof(now));
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_bw += rate_time * (td_bytes - ss->prev_bytes) /
+ (ss_check_interval * ss_check_interval / 1000L);
+ group_iops += rate_time * (td_iops - ss->prev_iops) /
+ (ss_check_interval * ss_check_interval / 1000L);
++group_ramp_time_over;
}
ss->prev_iops = td_iops;
{
struct steadystate_data *ss = &td->ss;
struct thread_options *o = &td->o;
+ int intervals;
memset(ss, 0, sizeof(*ss));
ss->dur = o->ss_dur;
ss->limit = o->ss_limit.u.f;
ss->ramp_time = o->ss_ramp_time;
+ ss_check_interval = o->ss_check_interval / 1000L;
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;
+ intervals = ss->dur / (ss_check_interval / 1000L);
+ ss->sum_x = intervals * (intervals - 1) / 2;
+ ss->sum_x_sq = (intervals - 1) * (intervals) * (2*intervals - 1) / 6;
}
/* make sure that ss options are consistent within reporting group */
{
int i;
uint64_t sum;
-
+ int intervals = ts->ss_dur / (ss_check_interval / 1000L);
+
if (!ts->ss_dur)
return 0;
- for (i = 0, sum = 0; i < ts->ss_dur; i++)
+ for (i = 0, sum = 0; i < intervals; i++)
sum += ts->ss_bw_data[i];
- return sum / ts->ss_dur;
+ return sum / intervals;
}
uint64_t steadystate_iops_mean(struct thread_stat *ts)
{
int i;
uint64_t sum;
+ int intervals = ts->ss_dur / (ss_check_interval / 1000L);
if (!ts->ss_dur)
return 0;
- for (i = 0, sum = 0; i < ts->ss_dur; i++)
+ for (i = 0, sum = 0; i < intervals; i++)
sum += ts->ss_iops_data[i];
- return sum / ts->ss_dur;
+ return sum / intervals;
}