#include "steadystate.h"
#include "helper_thread.h"
-bool steadystate = false;
+bool steadystate_enabled = false;
+
+static void steadystate_alloc(struct thread_data *td)
+{
+ int i;
+
+ td->ss.bw_data = malloc(td->ss.dur * sizeof(unsigned long));
+ td->ss.iops_data = malloc(td->ss.dur * sizeof(unsigned long));
+ /* initialize so that it is obvious if the cache is not full in the output */
+ for (i = 0; i < td->ss.dur; i++)
+ td->ss.iops_data[i] = td->ss.bw_data[i] = 0;
+}
void steadystate_setup(void)
{
int i, prev_groupid;
struct thread_data *td, *prev_td;
- if (!steadystate)
+ if (!steadystate_enabled)
return;
/*
}
}
-void steadystate_alloc(struct thread_data *td)
-{
- int i;
-
- td->ss.bw_data = malloc(td->ss.dur * sizeof(unsigned long));
- td->ss.iops_data = malloc(td->ss.dur * sizeof(unsigned long));
- /* initialize so that it is obvious if the cache is not full in the output */
- for (i = 0; i < td->ss.dur; i++)
- td->ss.iops_data[i] = td->ss.bw_data[i] = 0;
-}
-
static bool steadystate_slope(unsigned long iops, unsigned long bw,
struct thread_data *td)
{
int i, j;
double result;
struct steadystate_data *ss = &td->ss;
- unsigned long new_val = ss->check_iops ? iops : bw;
+ unsigned long new_val;
ss->bw_data[ss->tail] = bw;
ss->iops_data[ss->tail] = iops;
+ if (ss->mode & __FIO_SS_IOPS)
+ new_val = iops;
+ else
+ new_val = bw;
+
if (ss->tail < ss->head || (ss->tail - ss->head == ss->dur - 1)) {
if (ss->sum_y == 0) { /* first time through */
for(i = 0; i < ss->dur; i++) {
- ss->sum_y += ss->check_iops ? ss->iops_data[i] : ss->bw_data[i];
+ if (ss->mode & __FIO_SS_IOPS)
+ ss->sum_y += ss->iops_data[i];
+ else
+ ss->sum_y += ss->bw_data[i];
j = ss->head + i;
if (j >= ss->dur)
j -= ss->dur;
- ss->sum_xy += (ss->check_iops ? ss->iops_data[j] : ss->bw_data[j]) * i;
+ if (ss->mode & __FIO_SS_IOPS)
+ ss->sum_xy += ss->iops_data[j];
+ else
+ ss->sum_xy += ss->bw_data[j];
}
} else { /* easy to update the sums */
ss->sum_y -= ss->oldest_y;
ss->sum_xy = ss->sum_xy - ss->sum_y + ss->dur * new_val;
}
- ss->oldest_y = ss->check_iops ? ss->iops_data[ss->head] : ss->bw_data[ss->head];
+ if (ss->mode & __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.
+ * 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);
- ss->criterion = ss->pct ? 100.0 * ss->slope / (ss->sum_y / ss->dur) : ss->slope;
+ 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->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",
- ss->sum_y, ss->sum_xy, ss->slope, ss->criterion, ss->limit);
+ dprint(FD_STEADYSTATE, "sum_y: %llu, sum_xy: %llu, slope: %f, "
+ "criterion: %f, limit: %f\n",
+ ss->sum_y, ss->sum_xy, ss->slope,
+ ss->criterion, ss->limit);
result = ss->criterion * (ss->criterion < 0.0 ? -1.0 : 1.0);
if (result < ss->limit)
if (ss->tail < ss->head || (ss->tail - ss->head == ss->dur - 1)) {
if (ss->sum_y == 0) { /* first time through */
for(i = 0; i < ss->dur; i++)
- ss->sum_y += ss->check_iops ? ss->iops_data[i] : ss->bw_data[i];
+ if (ss->mode & __FIO_SS_IOPS)
+ ss->sum_y += ss->iops_data[i];
+ else
+ ss->sum_y += ss->bw_data[i];
} else { /* easy to update the sum */
ss->sum_y -= ss->oldest_y;
- ss->sum_y += ss->check_iops ? ss->iops_data[ss->tail] : ss->bw_data[ss->tail];
+ if (ss->mode & __FIO_SS_IOPS)
+ ss->sum_y += ss->iops_data[ss->tail];
+ else
+ ss->sum_y += ss->bw_data[ss->tail];
}
- ss->oldest_y = ss->check_iops ? ss->iops_data[ss->head] : ss->bw_data[ss->head];
+ if (ss->mode & __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++) {
- diff = (double) (ss->check_iops ? ss->iops_data[i] : ss->bw_data[i]) - mean;
+ if (ss->mode & __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));
}
- ss->criterion = ss->pct ? 100.0 * ss->deviation / mean : ss->deviation;
+ if (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", ss->sum_y, mean, ss->deviation, ss->criterion, ss->limit);
+ dprint(FD_STEADYSTATE, "sum_y: %llu, mean: %f, max diff: %f, "
+ "objective: %f, limit: %f\n",
+ ss->sum_y, mean, ss->deviation,
+ ss->criterion, ss->limit);
if (ss->criterion < ss->limit)
return true;
for_each_td(td, i) {
struct steadystate_data *ss = &td->ss;
- if (!ss->dur || td->runstate <= TD_SETTING_UP || td->runstate >= TD_EXITED || ss->attained)
+ if (!ss->dur || td->runstate <= TD_SETTING_UP ||
+ td->runstate >= TD_EXITED || ss->attained)
continue;
td_iops = 0;
if (td->o.group_reporting && !ss->last_in_group)
continue;
- /* don't begin checking criterion until ss->ramp_time is over for at least one thread in group */
+ /*
+ * 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: %lu, bw: %lu, head: %d, tail: %d\n",
- i, td->groupid, rate_time, group_iops, group_bw, ss->head, ss->tail);
+ dprint(FD_STEADYSTATE, "steadystate_check() thread: %d, "
+ "groupid: %u, rate_msec: %ld, "
+ "iops: %lu, bw: %lu, head: %d, tail: %d\n",
+ i, td->groupid, rate_time, group_iops,
+ group_bw, ss->head, ss->tail);
- if (steadystate_check_slope(&td->o))
+ if (td->o.ss & __FIO_SS_SLOPE)
ret = steadystate_slope(group_iops, group_bw, td);
else
ret = steadystate_deviation(group_iops, group_bw, td);
}
}
+void td_steadystate_init(struct thread_data *td)
+{
+ struct steadystate_data *ss = &td->ss;
+ struct thread_options *o = &td->o;
+
+ memset(ss, 0, sizeof(*ss));
+
+ if (!o->ss_dur)
+ return;
+ 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->pct = o->ss_pct;
+ ss->mode = o->ss;
+
+ ss->ramp_time_over = (td->ss.ramp_time == 0);
+ 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;
+
+ td->ts.ss = ss;
+}