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#include <time.h>
#include <glib.h>
#include "autoscaler.h"
/* i wish i could have used C99 initializers instead of writing this function */
void autoscaler_init(AutoScaler *that, unsigned interval, unsigned floor)
{
that->update_interval = interval;
that->floor = floor;
that->max = 0;
that->count = 0;
that->last_update = 0;
that->sum = 0.0f;
that->last_average = 0.0f;
}
unsigned autoscaler_get_max(AutoScaler *that, unsigned current)
{
time_t now;
that->sum += current;
that->count++;
time(&now);
if((float)difftime(now, that->last_update) > that->update_interval)
{
float new_average = that->sum / that->count;
float average;
if(new_average < that->last_average)
average = ((that->last_average * 0.5f) + new_average) / 1.5f;
else
average = new_average;
that->max = average * 1.2f;
that->sum = 0.0f;
that->count = 0;
that->last_update = now;
that->last_average = average;
}
that->max = MAX(that->max, current);
that->max = MAX(that->max, that->floor);
#if 0
printf("%p max = %u, current = %u, last_average = %f\n", that, that->max, current, that->last_average);
#endif
return that->max;
}
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