/*
This file is part of GNUnet.
- (C) 2010 Christian Grothoff (and other contributing authors)
+ (C) 2010, 2013 Christian Grothoff (and other contributing authors)
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
- by the Free Software Foundation; either version 2, or (at your
+ by the Free Software Foundation; either version 3, or (at your
option) any later version.
GNUnet is distributed in the hope that it will be useful, but
* @author Christian Grothoff
*/
#include "platform.h"
-#include "gnunet_load_lib.h"
+#include "gnunet_util_lib.h"
-#define DEBUG_LOAD GNUNET_NO
+
+#define LOG(kind,...) GNUNET_log_from (kind, "util", __VA_ARGS__)
/**
* Values we track for load calculations.
*/
-struct GNUNET_LOAD_Value
+struct GNUNET_LOAD_Value
{
/**
/**
* Last time this load value was updated by an event.
- */
+ */
struct GNUNET_TIME_Absolute last_update;
/**
* first 4 billion requests).
*/
uint64_t cummulative_delay;
-
+
/**
* Sum of squares of all datastore delays ever observed (in ms). Note that
* delays above 64k ms are excluded (to avoid overflow within
* first 4 billion requests).
*/
uint64_t cummulative_squared_delay;
-
+
/**
* Total number of requests included in the cummulative datastore delay values.
*/
uint64_t cummulative_request_count;
-
+
/**
* Current running average datastore delay. Its relation to the
* average datastore delay and it std. dev. (as calcualted from the
struct GNUNET_TIME_Relative delta;
unsigned int n;
- if (load->autodecline.value == GNUNET_TIME_UNIT_FOREVER_REL.value)
+ if (load->autodecline.rel_value_us == GNUNET_TIME_UNIT_FOREVER_REL.rel_value_us)
return;
delta = GNUNET_TIME_absolute_get_duration (load->last_update);
- if (delta.value < load->autodecline.value)
+ if (delta.rel_value_us < load->autodecline.rel_value_us)
return;
- n = delta.value / load->autodecline.value;
+ if (0 == load->autodecline.rel_value_us)
+ {
+ load->runavg_delay = 0.0;
+ load->load = 0;
+ return;
+ }
+ n = delta.rel_value_us / load->autodecline.rel_value_us;
if (n > 16)
- {
- load->runavg_delay = 0.0;
- load->load = 0;
- return;
- }
+ {
+ load->runavg_delay = 0.0;
+ load->load = 0;
+ return;
+ }
while (n > 0)
- {
- n--;
- load->runavg_delay = (load->runavg_delay * 7.0) / 8.0;
- }
+ {
+ n--;
+ load->runavg_delay = (load->runavg_delay * 7.0) / 8.0;
+ }
}
{
struct GNUNET_LOAD_Value *ret;
- GNUNET_assert (autodecline.value != 0);
- ret = GNUNET_malloc (sizeof (struct GNUNET_LOAD_Value));
+ ret = GNUNET_new (struct GNUNET_LOAD_Value);
ret->autodecline = autodecline;
ret->last_update = GNUNET_TIME_absolute_get ();
return ret;
*/
void
GNUNET_LOAD_value_set_decline (struct GNUNET_LOAD_Value *load,
- struct GNUNET_TIME_Relative autodecline)
+ struct GNUNET_TIME_Relative autodecline)
{
internal_update (load);
- load->autodecline = autodecline;
+ load->autodecline = autodecline;
}
if (load->cummulative_request_count <= 1)
return;
/* calcuate std dev of latency; we have for n values of "i" that:
-
- avg = (sum val_i) / n
- stddev = (sum (val_i - avg)^2) / (n-1)
- = (sum (val_i^2 - 2 avg val_i + avg^2) / (n-1)
- = (sum (val_i^2) - 2 avg sum (val_i) + n * avg^2) / (n-1)
- */
+ *
+ * avg = (sum val_i) / n
+ * stddev = (sum (val_i - avg)^2) / (n-1)
+ * = (sum (val_i^2 - 2 avg val_i + avg^2) / (n-1)
+ * = (sum (val_i^2) - 2 avg sum (val_i) + n * avg^2) / (n-1)
+ */
sum_val_i = (double) load->cummulative_delay;
n = ((double) load->cummulative_request_count);
nm1 = n - 1.0;
avgdel = sum_val_i / n;
- stddev = (((double) load->cummulative_squared_delay) - 2.0 * avgdel * sum_val_i + n * avgdel * avgdel) / nm1;
+ stddev =
+ (((double) load->cummulative_squared_delay) - 2.0 * avgdel * sum_val_i +
+ n * avgdel * avgdel) / nm1;
if (stddev <= 0)
- stddev = 0.01; /* must have been rounding error or zero; prevent division by zero */
+ stddev = 0.01; /* must have been rounding error or zero; prevent division by zero */
/* now calculate load based on how far out we are from
- std dev; or if we are below average, simply assume load zero */
+ * std dev; or if we are below average, simply assume load zero */
if (load->runavg_delay < avgdel)
load->load = 0.0;
else
- load->load = (load->runavg_delay - avgdel) / stddev;
+ load->load = (load->runavg_delay - avgdel) / stddev;
}
* @param data latest measurement value (for example, delay)
*/
void
-GNUNET_LOAD_update (struct GNUNET_LOAD_Value *load,
- uint64_t data)
+GNUNET_LOAD_update (struct GNUNET_LOAD_Value *load, uint64_t data)
{
uint32_t dv;
internal_update (load);
load->last_update = GNUNET_TIME_absolute_get ();
if (data > 64 * 1024)
- {
- /* very large */
- load->load = 100.0;
- return;
- }
+ {
+ /* very large */
+ load->load = 100.0;
+ return;
+ }
dv = (uint32_t) data;
load->cummulative_delay += dv;
- load->cummulative_squared_delay += dv * dv;
+ load->cummulative_squared_delay += dv * dv;
load->cummulative_request_count++;
load->runavg_delay = ((load->runavg_delay * 7.0) + dv) / 8.0;
}