X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/b6d559f77513404532d4379b227cd773bbbfef72..53f36dc53dfef67528460488c6d8ee3913153968:/src/surf/network_ns3.cpp

diff --git a/src/surf/network_ns3.cpp b/src/surf/network_ns3.cpp
index 933b4df7f7..741622330a 100644
--- a/src/surf/network_ns3.cpp
+++ b/src/surf/network_ns3.cpp
@@ -17,6 +17,7 @@
 #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 "network_ns3.hpp"
 #include "ns3/ns3_simulator.hpp"
@@ -39,6 +40,7 @@ std::vector<std::string> IPV4addr;
  *****************/
 
 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;
@@ -190,34 +192,22 @@ Action* NetworkNS3Model::communicate(s4u::Host* src, s4u::Host* dst, double size
 
 double NetworkNS3Model::next_occuring_event(double now)
 {
-  double time_to_next_flow_completion;
+  double time_to_next_flow_completion = 0.0;
   XBT_DEBUG("ns3_next_occuring_event");
 
   //get the first relevant value from the running_actions list
   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());
@@ -245,7 +235,13 @@ void NetworkNS3Model::update_actions_state(double now, double delta)
     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 inconsistant 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_;
@@ -263,6 +259,7 @@ void NetworkNS3Model::update_actions_state(double now, double delta)
     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_,
@@ -279,6 +276,7 @@ void NetworkNS3Model::update_actions_state(double now, double delta)
     }
     delete flow;
     flow_from_sock.erase(ns3_socket);
+    sink_from_sock.erase(ns3_socket);
   }
 }
 
@@ -335,17 +333,22 @@ NetworkNS3Action::NetworkNS3Action(Model* model, double totalBytes, s4u::Host* s
 
   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);