TIMESTAMP network::sync(TIMESTAMP t0, TIMESTAMP t1)
{
OBJECT *obj = OBJECTHDR(this);
// update latency?
if(latency_last_update + latency_period <= t1){
update_latency();
}
if ((latency_period <= 0.001) ||
(next_event != TS_NEVER) && (next_event < latency_next_update) ){
return next_event;
} else {
return latency_next_update;
}
}
int network::init(OBJECT *parent)
{
OBJECT *hdr = OBJECTHDR(this);
// input validation checks
if(latency_mode[0] != 0){
random_type = gl_randomtype(latency_mode);
if(random_type == RT_INVALID){
GL_THROW("unrecognized random type \'%s\'", latency_mode.get_string());
}
} else {
random_type = RT_INVALID; // prevents update_latency from updating the value
}
if(latency_period < 0.0){
gl_warning("negative latency_period was reset to zero");
latency_period = 0.0;
}
if(bandwidth <= 0.0){
gl_error("non-positive bandwidth");
return 0;
}
switch(queue_resolution){
case QR_QUEUE:
if(buffer_size <= 0.0){
gl_error("non-positive buffer_size when using buffered queue_resolution");
}
break;
case QR_REJECT:
// requires no checks
break;
default:
gl_error("unrecognized queue_resolution, defaulting to QR_REJECT");
queue_resolution = QR_REJECT;
break;
}
if(timeout < 0.0){
gl_warning("negative timeout was reset to zero");
timeout = 0.0;
}
// operational variable defaults
bandwidth_used = 0.0;
update_latency();
latency_last_update = gl_globalclock;
next_event = TS_NEVER;
// success
return 1;
}
update_latency_fn_t instrumentation::add_latency(
const std::string service,
const std::string description,
std::vector<double> percentiles)
{
CHECK(rates_id_.load() < k_max_latencies)
<< "max number of percentiles reached";
int id = latencies_id_.fetch_add(1);
latencies_[id].service = service;
latencies_[id].description = description;
latencies_[id].percentiles = percentiles;
return [=](const double v) { update_latency(id, v); };
}
void
rpc_manager::doRPCcb (aclnt_cb realcb, ptr<location> l, u_int64_t sent,
clnt_stat err)
{
if (err) {
nrpcfailed++;
l->set_alive (false);
} else {
nrpc++;
// Only update latency on successful RPC.
// This probably includes time needed for rexmits.
u_int64_t now = getusec ();
// prevent overflow, caused by time reversal
if (now >= sent) {
u_int64_t lat = now - sent;
update_latency (NULL, l, lat);
} else {
warn << "*** Ignoring timewarp: sent " << sent
<< " > now " << now << "\n";
}
}
(realcb) (err);
}
