1 files changed, 53 insertions, 0 deletions
diff --git a/multiload/src/autoscaler.c b/multiload/src/autoscaler.c
new file mode 100644
index 00000000..fb03533f
--- /dev/null
+++ b/multiload/src/autoscaler.c
@@ -0,0 +1,53 @@
+#include <glib.h>
+
+#include "autoscaler.h"
+
+/* i wish i could have used C99 initializers instead of writing this function */
+void
+autoscaler_init (AutoScaler *that,
+ gint64 interval,
+ guint64 floor)
+{
+ that->update_interval = interval;
+ that->floor = floor;
+ that->max = 0;
+ that->count = 0;
+ that->last_update = 0;
+ that->sum = 0;
+ that->last_average = 0.0f;
+}
+
+guint64
+autoscaler_get_max (AutoScaler *that,
+ guint64 current)
+{
+ gint64 now;
+
+ that->sum += current;
+ that->count++;
+ now = g_get_monotonic_time ();
+
+ if ((now - that->last_update) > that->update_interval)
+ {
+ float new_average = (float) that->sum / (float) 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 = (guint64) (average * 1.2f);
+ that->sum = 0;
+ 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;
+}