introduced monitor performance controls for large number of cores

src/control/parameters.cpp

@@ -495,7 +495,7 @@ void Params::read_xml(std::string filename) {
     limits.services.signal.times.clientflush = 600; // 600 seconds
 
     limits.services.monitor.delay = 1; // 1 second
-    limits.services.monitor.sampling = 1; //  seconds
+    limits.services.monitor.sampling = 0; // 0 = automatic 
     
     limits.decomposition.utilization = 0.95; // 5% max loss
     limits.decomposition.partitions.automatic = true; // pick number of independent partitions based on some heuristics

src/scatter_devices/abstract_scatter_device.cpp

@@ -131,11 +131,12 @@ void AbstractScatterDevice::runner() {
      
      size_t samplingfactor = Params::Inst()->limits.services.monitor.sampling;
      if (samplingfactor==0) {
-         samplingfactor = allcomm_.size()/100;
-         if (allcomm_.size()<100) samplingfactor=1;
+         samplingfactor = allcomm_.size()/20;
+         if (allcomm_.size()<20) samplingfactor=1;
      }
      p_monitor_->set_samplingfactor(samplingfactor);
      if (allcomm_.rank()==0) {
+         Info::Inst()->write(string("Setting progress sampling factor for monitoring to ")+boost::lexical_cast<string>(samplingfactor));
          p_monitor_->set_samplingfactor_server(samplingfactor);
          p_monitor_->reset_server();
      }