Added a gtnets_jitter_seed parameter enabling jitted repeatable experiments, activate...

[simgrid.git] / src / surf / gtnets / gtnets_simulator.cc

diff --git a/src/surf/gtnets/gtnets_simulator.cc b/src/surf/gtnets/gtnets_simulator.cc
index 4a9a950..bc66408 100644 (file)
--- a/src/surf/gtnets/gtnets_simulator.cc
+++ b/src/surf/gtnets/gtnets_simulator.cc
@@ -36,6 +36,8 @@ GTSim::GTSim(){
   sim_ = new Simulator();
   topo_ = new GTNETS_Topology();
   uniform_jitter_ = NULL;
+  jitter_ = 0;
+  jitter_seed_ = 10;
 
   sim_->verbose=false;
   // Set default values.
@@ -100,10 +102,12 @@ int GTSim::add_link(int id, double bandwidth, double latency){
   DEBUG3("Creating a new P2P, linkid %d, bandwidth %gl, latency %gl", id, bandwidth, latency);
   gtnets_links_[id] = new Linkp2p(bw, latency);
   if(jitter_ > 0){
-       DEBUG1("Using jitter %f", jitter_);
-       double min = 0.0;
+       DEBUG2("Using jitter %f, and seed %u", jitter_, jitter_seed_);
+       double min = -1*jitter_*latency;
        double max = jitter_*latency;
        if(uniform_jitter_ == NULL){
+               Random::GlobalSeed(jitter_seed_  , jitter_seed_+1, jitter_seed_+2,
+                                                  jitter_seed_+3, jitter_seed_+4, jitter_seed_+5);
                uniform_jitter_ = new Uniform(min,max);
        }
        gtnets_links_[id]->Jitter((const Random &) *uniform_jitter_);
@@ -311,6 +315,10 @@ void GTSim::set_jitter(double d){
   jitter_ = d;
 }
 
+void GTSim::set_jitter_seed(int s){
+  jitter_seed_ = s;
+}
+
 void static tcp_sent_callback(void* action, double completion_time){
   // Schedule the flow complete event.
   SimulatorEvent* e =