#include <ns3/ipv4-address-helper.h>
#include <ns3/packet-sink-helper.h>
#include <ns3/point-to-point-helper.h>
+#include <ns3/application-container.h>
+#include <ns3/event-id.h>
#include "network_ns3.hpp"
#include "ns3/ns3_simulator.hpp"
*****************/
extern std::map<std::string, SgFlow*> flow_from_sock;
+extern std::map<std::string, ns3::ApplicationContainer> sink_from_sock;
static ns3::InternetStackHelper stack;
static ns3::NodeContainer nodes;
simgrid::xbt::Extension<simgrid::kernel::routing::NetPoint, NetPointNs3> NetPointNs3::EXTENSION_ID;
-NetPointNs3::NetPointNs3()
+NetPointNs3::NetPointNs3() : ns3_node_(ns3::CreateObject<ns3::Node>(0))
{
- ns3_node_ = ns3::CreateObject<ns3::Node>(0);
stack.Install(ns3_node_);
nodes.Add(ns3_node_);
node_num = number_of_nodes++;
// Create private link
std::string host_id = cluster.prefix + std::to_string(i) + cluster.suffix;
- auto* host_src = simgrid::s4u::Host::by_name(host_id)->pimpl_netpoint->extension<NetPointNs3>();
+ auto* host_src = simgrid::s4u::Host::by_name(host_id)->get_netpoint()->extension<NetPointNs3>();
xbt_assert(host_src, "Cannot find a ns-3 host of name %s", host_id.c_str());
// Any ns-3 route is symmetrical
return new NetworkNS3Action(this, size, src, dst);
}
-double NetworkNS3Model::next_occuring_event(double now)
+double NetworkNS3Model::next_occurring_event(double now)
{
- double time_to_next_flow_completion;
- XBT_DEBUG("ns3_next_occuring_event");
+ double time_to_next_flow_completion = 0.0;
+ XBT_DEBUG("ns3_next_occurring_event");
//get the first relevant value from the running_actions list
+
+ // If there is no comms in NS-3, then we do not move it forward.
+ // We will synchronize NS-3 with SimGrid when starting a new communication.
+ // (see NetworkNS3Action::NetworkNS3Action() for more details on this point)
if (get_started_action_set()->empty() || now == 0.0)
return -1.0;
- bool ns3_processed_all_finished_flows;
- do {
- double delta = surf_get_clock() + now - ns3::Simulator::Now().GetSeconds();
- ns3_simulator(delta);
- time_to_next_flow_completion = ns3::Simulator::Now().GetSeconds() - surf_get_clock();
-
- // NS3 stops as soon as it detects that a flow is finished.
- // However, to stop NS3 in a consistant state for the current simulated time,
- // we need to make sure that NS3 detects all the flows finishing at the current time.
- ns3_processed_all_finished_flows = true;
- // A flow that has 0 remaining_ is finishing at the current simulated time.
- // However, NS3 hadn't notice it yet if finished_ == false.
- for (const auto& elm : flow_from_sock) {
- SgFlow* sgFlow = elm.second;
- if(!sgFlow->finished_ && sgFlow->remaining_ == 0){
- ns3_processed_all_finished_flows = false;
- break;
- }
- }
- } while (!ns3_processed_all_finished_flows || double_equals(time_to_next_flow_completion, 0, sg_surf_precision));
-
+ XBT_DEBUG("doing a ns3 simulation for a duration of %f", now);
+ ns3_simulator(now);
+ time_to_next_flow_completion = ns3::Simulator::Now().GetSeconds() - surf_get_clock();
+ // NS-3 stops as soon as a flow ends,
+ // but it does not process the other flows that may finish at the same (simulated) time.
+ // If another flow ends at the same time, time_to_next_flow_completion = 0
+ if(double_equals(time_to_next_flow_completion, 0, sg_surf_precision))
+ time_to_next_flow_completion = 0.0;
+
XBT_DEBUG("min : %f", now);
XBT_DEBUG("ns3 time : %f", ns3::Simulator::Now().GetSeconds());
XBT_DEBUG("surf time : %f", surf_get_clock());
{
static std::vector<std::string> socket_to_destroy;
- /* If there are no running flows, advance the ns-3 simulator and return */
- if (get_started_action_set()->empty()) {
-
- while(double_positive(now - ns3::Simulator::Now().GetSeconds(), sg_surf_precision))
- ns3_simulator(now-ns3::Simulator::Now().GetSeconds());
-
- return;
- }
-
std::string ns3_socket;
for (const auto& elm : flow_from_sock) {
ns3_socket = elm.first;
SgFlow* sgFlow = elm.second;
NetworkNS3Action * action = sgFlow->action_;
XBT_DEBUG("Processing socket %p (action %p)",sgFlow,action);
- action->set_remains(action->get_cost() - sgFlow->sent_bytes_);
+ // Because NS3 stops as soon as a flow is finished, the other flows that ends at the same time may remains in an
+ // inconsistent state (i.e. remains_ == 0 but finished_ == false).
+ // However, SimGrid considers sometimes that an action with remains_ == 0 is finished.
+ // Thus, to avoid inconsistencies between SimGrid and NS3, set remains to 0 only when the flow is finished in NS3
+ int remains = action->get_cost() - sgFlow->sent_bytes_;
+ if(remains > 0)
+ action->set_remains(remains);
if (TRACE_is_enabled() && action->get_state() == kernel::resource::Action::State::STARTED) {
double data_delta_sent = sgFlow->sent_bytes_ - action->last_sent_;
if(sgFlow->finished_){
socket_to_destroy.push_back(ns3_socket);
XBT_DEBUG("Destroy socket %p of action %p", ns3_socket.c_str(), action);
+ action->set_remains(0);
action->finish(kernel::resource::Action::State::FINISHED);
} else {
XBT_DEBUG("Socket %p sent %u bytes out of %u (%u remaining)", ns3_socket.c_str(), sgFlow->sent_bytes_,
}
delete flow;
flow_from_sock.erase(ns3_socket);
+ sink_from_sock.erase(ns3_socket);
}
}
NetworkNS3Action::NetworkNS3Action(Model* model, double totalBytes, s4u::Host* src, s4u::Host* dst)
: NetworkAction(model, totalBytes, false), src_(src), dst_(dst)
{
+
+ // If there is no other started actions, we need to move NS-3 forward to be sync with SimGrid
+ if (model->get_started_action_set()->size()==1){
+ while(double_positive(surf_get_clock() - ns3::Simulator::Now().GetSeconds(), sg_surf_precision)){
+ XBT_DEBUG("Synchronizing NS-3 (time %f) with SimGrid (time %f)", ns3::Simulator::Now().GetSeconds(), surf_get_clock());
+ ns3_simulator(surf_get_clock() - ns3::Simulator::Now().GetSeconds());
+ }
+ }
+
XBT_DEBUG("Communicate from %s to %s", src->get_cname(), dst->get_cname());
static int port_number = 1025; // Port number is limited from 1025 to 65 000
- unsigned int node1 = src->pimpl_netpoint->extension<NetPointNs3>()->node_num;
- unsigned int node2 = dst->pimpl_netpoint->extension<NetPointNs3>()->node_num;
+ unsigned int node1 = src->get_netpoint()->extension<NetPointNs3>()->node_num;
+ unsigned int node2 = dst->get_netpoint()->extension<NetPointNs3>()->node_num;
- ns3::Ptr<ns3::Node> src_node = src->pimpl_netpoint->extension<NetPointNs3>()->ns3_node_;
- ns3::Ptr<ns3::Node> dst_node = dst->pimpl_netpoint->extension<NetPointNs3>()->ns3_node_;
+ ns3::Ptr<ns3::Node> src_node = src->get_netpoint()->extension<NetPointNs3>()->ns3_node_;
+ ns3::Ptr<ns3::Node> dst_node = dst->get_netpoint()->extension<NetPointNs3>()->ns3_node_;
xbt_assert(node2 < IPV4addr.size(), "Element %s is unknown to ns-3. Is it connected to any one-hop link?",
- dst->pimpl_netpoint->get_cname());
+ dst->get_netpoint()->get_cname());
std::string& addr = IPV4addr[node2];
xbt_assert(not addr.empty(), "Element %s is unknown to ns-3. Is it connected to any one-hop link?",
- dst->pimpl_netpoint->get_cname());
+ dst->get_netpoint()->get_cname());
XBT_DEBUG("ns3: Create flow of %.0f Bytes from %u to %u with Interface %s", totalBytes, node1, node2, addr.c_str());
ns3::PacketSinkHelper sink("ns3::TcpSocketFactory", ns3::InetSocketAddress(ns3::Ipv4Address::GetAny(), port_number));
- sink.Install(dst_node);
+ ns3::ApplicationContainer apps = sink.Install(dst_node);
ns3::Ptr<ns3::Socket> sock = ns3::Socket::CreateSocket(src_node, ns3::TcpSocketFactory::GetTypeId());
flow_from_sock.insert({transform_socket_ptr(sock), new SgFlow(totalBytes, this)});
+ sink_from_sock.insert({transform_socket_ptr(sock), apps});
sock->Bind(ns3::InetSocketAddress(port_number));
ns3::Simulator::ScheduleNow(&start_flow, sock, addr.c_str(), port_number);
port_number++;
+ if(port_number > 65000){
+ port_number = 1025;
+ XBT_WARN("Too many connections! Port number is saturated. Trying to use the oldest ports.");
+ }
xbt_assert(port_number <= 65000, "Too many connections! Port number is saturated.");
s4u::Link::on_communicate(*this, src, dst);
void ns3_simulator(double maxSeconds)
{
+ ns3::EventId id;
if (maxSeconds > 0.0) // If there is a maximum amount of time to run
- ns3::Simulator::Stop(ns3::Seconds(maxSeconds));
+ id = ns3::Simulator::Schedule(ns3::Seconds(maxSeconds), &ns3::Simulator::Stop);
+
XBT_DEBUG("Start simulator for at most %fs (current time: %f)", maxSeconds, surf_get_clock());
ns3::Simulator::Run ();
+ XBT_DEBUG("Simulator stopped at %fs", ns3::Simulator::Now().GetSeconds());
+
+ if(maxSeconds > 0.0)
+ id.Cancel();
}
// initialize the ns-3 interface and environment
