/**
* Over how many values do we calculate the weighted average?
*/
-#define HISTORY_SIZE 8
-
-/**
- * Size of the queue to core.
- */
-#define CORE_QUEUE_SIZE 2
+#define HISTORY_SIZE 64
/**
* Message priority to use.
setup_estimate_message (struct GNUNET_NSE_ClientMessage *em)
{
unsigned int i;
+ unsigned int j;
double mean;
double sum;
double std_dev;
double variance;
double val;
- double weight;
+ double nsize;
+
+ /* Weighted incremental algorithm for stddev according to West (1979) */
+#if WEST
double sumweight;
+ double weight;
double q;
double r;
double temp;
- double nsize;
- /* Weighted incremental algorithm for stddev according to West (1979) */
mean = 0.0;
sum = 0.0;
sumweight = 0.0;
for (i = 0; i < estimate_count; i++)
{
- val =
- htonl (size_estimate_messages
- [(estimate_index - i +
- HISTORY_SIZE) % HISTORY_SIZE].matching_bits);
- weight = 1; /* was: estimate_count + 1 - i; */
+ j = (estimate_index - i + HISTORY_SIZE) % HISTORY_SIZE;
+ val = htonl (size_estimate_messages[j].matching_bits);
+ weight = 1.0; /* was: estimate_count + 1 - i; */
temp = weight + sumweight;
q = val - mean;
r = q * weight / temp;
- sum += sumweight * q * r;
mean += r;
+ sum += sumweight * q * r;
sumweight = temp;
}
- variance = sum / (sumweight - 1.0);
+ if (estimate_count > 0)
+ variance = (sum / sumweight) * estimate_count / (estimate_count - 1.0);
+#else
+ /* trivial version for debugging */
+ double vsq;
+
+ /* non-weighted trivial version */
+ sum = 0.0;
+ vsq = 0.0;
+ variance = 0.0;
+ mean = 0.0;
+
+ for (i = 0; i < estimate_count; i++)
+ {
+ j = (estimate_index - i + HISTORY_SIZE) % HISTORY_SIZE;
+ val = htonl (size_estimate_messages[j].matching_bits);
+ sum += val;
+ vsq += val * val;
+ }
+ if (0 != estimate_count)
+ {
+ mean = sum / estimate_count;
+ variance = (vsq - mean * sum) / (estimate_count - 1.0); // terrible for numerical stability...
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "(%f - %f) / %u = %f\n",
+ vsq, mean * sum, estimate_count - 1, variance);
+
+ }
+#endif
GNUNET_assert (variance >= 0);
std_dev = sqrt (variance);
current_std_dev = std_dev;
current_size_estimate = mean;
-
+
em->header.size = htons (sizeof (struct GNUNET_NSE_ClientMessage));
em->header.type = htons (GNUNET_MESSAGE_TYPE_NSE_ESTIMATE);
em->reserved = htonl (0);
fm->pkey = my_public_key;
fm->proof_of_work = my_proof;
GNUNET_assert (GNUNET_OK ==
- GNUNET_CRYPTO_rsa_sign (my_private_key, &fm->purpose, &fm->signature));
+ GNUNET_CRYPTO_rsa_sign (my_private_key, &fm->purpose,
+ &fm->signature));
}
{
size_estimate_messages[i].proof_of_work = my_proof;
GNUNET_assert (GNUNET_OK ==
- GNUNET_CRYPTO_rsa_sign (my_private_key,
- &size_estimate_messages[i].purpose,
- &size_estimate_messages[i].signature));
+ GNUNET_CRYPTO_rsa_sign (my_private_key,
+ &size_estimate_messages
+ [i].purpose,
+ &size_estimate_messages
+ [i].signature));
}
write_proof ();
return;
handle_p2p_size_estimate (void *cls, const struct GNUNET_PeerIdentity *peer,
const struct GNUNET_MessageHeader *message,
const struct GNUNET_ATS_Information *atsi,
- unsigned int atsi_count)
+ unsigned int atsi_count)
{
const struct GNUNET_NSE_FloodMessage *incoming_flood;
struct GNUNET_TIME_Absolute ts;
static void
handle_core_connect (void *cls, const struct GNUNET_PeerIdentity *peer,
const struct GNUNET_ATS_Information *atsi,
- unsigned int atsi_count)
+ unsigned int atsi_count)
{
struct NSEPeerEntry *peer_entry;
#endif
peer_entry = GNUNET_malloc (sizeof (struct NSEPeerEntry));
peer_entry->id = *peer;
- GNUNET_CONTAINER_multihashmap_put (peers, &peer->hashPubKey, peer_entry,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
+ GNUNET_assert (GNUNET_OK ==
+ GNUNET_CONTAINER_multihashmap_put (peers, &peer->hashPubKey, peer_entry,
+ GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
peer_entry->transmit_task =
GNUNET_SCHEDULER_add_delayed (get_transmit_delay (-1), &transmit_task,
peer_entry);
nc = GNUNET_SERVER_notification_context_create (server, 1);
/* Connect to core service and register core handlers */
coreAPI = GNUNET_CORE_connect (cfg, /* Main configuration */
- CORE_QUEUE_SIZE, /* queue size */
+ 1,
NULL, /* Closure passed to functions */
&core_init, /* Call core_init once connected */
&handle_core_connect, /* Handle connects */