protected TimeSpan ComputeDynamicTimeout() {
TimeSpan timeout;
//Compute the mean and stddev of LastInPacketDateTime:
double sum = 0.0;
double sum2 = 0.0;
int count = 0;
DateTime now = DateTime.UtcNow;
foreach(Connection con in _connection_table) {
Edge e = con.State.Edge;
double this_int = (now - e.LastInPacketDateTime).TotalMilliseconds;
sum += this_int;
sum2 += this_int * this_int;
count++;
}
/*
* Compute the mean and std.dev:
*/
if( count > 1 ) {
double mean = sum / count;
double s2 = sum2 - count * mean * mean;
double stddev = Math.Sqrt( s2 /(count - 1) );
double timeout_d = mean + stddev;
ProtocolLog.WriteIf(ProtocolLog.NodeLog, String.Format(
"Connection timeout: {0}, mean: {1} stdev: {2}", timeout_d,
mean, stddev));
timeout = TimeSpan.FromMilliseconds( timeout_d );
if( timeout > MAX_CONNECTION_TIMEOUT ) {
timeout = MAX_CONNECTION_TIMEOUT;
}
}
else {
//Keep the old timeout. Don't let small number statistics bias us
timeout = _connection_timeout;
}
return timeout;
}
/**
