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pickle.load concurrency issue
[modules/yacs.git] / src / runtime / PythonNode.cxx
index 3dea3eefdf0734bd119aba7591235fa0c38a06e3..66c7aae24dfb4ceaad737d3e8a0aebc1756049fe 100644 (file)
@@ -1,9 +1,9 @@
-// Copyright (C) 2006-2013  CEA/DEN, EDF R&D
+// Copyright (C) 2006-2021  CEA/DEN, EDF R&D
 //
 // This library is free software; you can redistribute it and/or
 // modify it under the terms of the GNU Lesser General Public
 // License as published by the Free Software Foundation; either
-// version 2.1 of the License.
+// version 2.1 of the License, or (at your option) any later version.
 //
 // This library is distributed in the hope that it will be useful,
 // but WITHOUT ANY WARRANTY; without even the implied warranty of
 #include "PythonNode.hxx"
 #include "PythonPorts.hxx"
 #include "TypeCode.hxx"
+#include "PythonCppUtils.hxx"
 #include "Container.hxx"
 #include "SalomeContainer.hxx"
+#include "SalomeHPContainer.hxx"
+#include "SalomeContainerTmpForHP.hxx"
 #include "ConversionException.hxx"
 
 #include "PyStdout.hxx"
 #include <iostream>
+#include <memory>
 #include <sstream>
 #include <fstream>
 
@@ -45,77 +49,338 @@ typedef int Py_ssize_t;
 using namespace YACS::ENGINE;
 using namespace std;
 
+const char PythonEntry::SCRIPT_FOR_SIMPLE_SERIALIZATION[]="import pickle\n"
+    "def pickleForVarSimplePyth2009(val):\n"
+    "  return pickle.dumps(val,-1)\n"
+    "\n";
+
 const char PythonNode::IMPL_NAME[]="Python";
 const char PythonNode::KIND[]="Python";
 
-PythonNode::PythonNode(const PythonNode& other, ComposedNode *father):InlineNode(other,father)
+const char PythonNode::SCRIPT_FOR_SERIALIZATION[]="import pickle\n"
+    "def pickleForDistPyth2009(kws):\n"
+    "  return pickle.dumps(((),kws),-1)\n"
+    "\n"
+    "def unPickleForDistPyth2009(st):\n"
+    "  args=pickle.loads(st)\n"
+    "  return args\n";
+
+const char PythonNode::REMOTE_NAME[]="remote";
+
+const char PythonNode::DPL_INFO_NAME[]="my_dpl_localization";
+
+const char PyFuncNode::SCRIPT_FOR_SERIALIZATION[]="import pickle\n"
+    "def pickleForDistPyth2009(*args,**kws):\n"
+    "  return pickle.dumps((args,kws),-1)\n"
+    "\n"
+    "def unPickleForDistPyth2009(st):\n"
+    "  args=pickle.loads(st)\n"
+    "  return args\n";
+
+// pickle.load concurrency issue : see https://bugs.python.org/issue12680
+#if PY_VERSION_HEX < 0x03070000
+#include <mutex>
+static std::mutex data_mutex;
+#endif
+
+PythonEntry::PythonEntry():_context(0),_pyfuncSer(0),_pyfuncUnser(0),_pyfuncSimpleSer(0)
 {
-  _implementation=IMPL_NAME;
-  PyGILState_STATE gstate=PyGILState_Ensure();
-  _context=PyDict_New();
-  if( PyDict_SetItemString( _context, "__builtins__", getSALOMERuntime()->getBuiltins() ))
+}
+
+PythonEntry::~PythonEntry()
+{
+  AutoGIL agil;
+  DEBTRACE( "_context refcnt: " << _context->ob_refcnt );
+  // not Py_XDECREF of _pyfuncUnser because it is returned by PyDict_GetItem -> borrowed
+  // not Py_XDECREF of _pyfuncSer because it is returned by PyDict_GetItem -> borrowed
+  Py_XDECREF(_context);
+}
+
+void PythonEntry::loadRemoteContainer(InlineNode *reqNode)
+{
+  DEBTRACE( "---------------PythonEntry::CommonRemoteLoad function---------------" );
+  Container *container(reqNode->getContainer());
+  bool isContAlreadyStarted(false);
+  if(container)
     {
-      stringstream msg;
-      msg << "Impossible to set builtins" << __FILE__ << ":" << __LINE__;
-      PyGILState_Release(gstate);
-      _errorDetails=msg.str();
-      throw Exception(msg.str());
+      try
+      {
+        if(hasImposedResource())
+          container->start(reqNode, _imposedResource, _imposedContainer);
+        else
+        {
+          isContAlreadyStarted=container->isAlreadyStarted(reqNode);
+          if(!isContAlreadyStarted)
+            container->start(reqNode);
+        }
+      }
+      catch(Exception& e)
+      {
+          reqNode->setErrorDetails(e.what());
+          throw e;
+      }
+    }
+  else
+    {
+      std::string what("PythonEntry::CommonRemoteLoad : a load operation requested on \"");
+      what+=reqNode->getName(); what+="\" with no container specified.";
+      reqNode->setErrorDetails(what);
+      throw Exception(what);
     }
-  PyGILState_Release(gstate);
 }
 
-PythonNode::PythonNode(const std::string& name):InlineNode(name)
+Engines::Container_var GetContainerObj(InlineNode *reqNode, bool& isStandardCont)
 {
-  _implementation=IMPL_NAME;
-  PyGILState_STATE gstate = PyGILState_Ensure();
-  _context=PyDict_New();
-  if( PyDict_SetItemString( _context, "__builtins__", getSALOMERuntime()->getBuiltins() ))
+  isStandardCont = false;
+  Container *container(reqNode->getContainer());
+  Engines::Container_var objContainer(Engines::Container::_nil());
+  if(!container)
+    throw YACS::Exception("No container specified !");
+  SalomeContainer *containerCast0(dynamic_cast<SalomeContainer *>(container));
+  SalomeHPContainer *containerCast1(dynamic_cast<SalomeHPContainer *>(container));
+  if(containerCast0)
     {
-      stringstream msg;
-      msg << "Impossible to set builtins" << __FILE__ << ":" << __LINE__;
-      PyGILState_Release(gstate);
-      _errorDetails=msg.str();
-      throw Exception(msg.str());
+      isStandardCont = true;
+      objContainer=containerCast0->getContainerPtr(reqNode);
+    }
+  else if(containerCast1)
+    {
+      YACS::BASES::AutoCppPtr<SalomeContainerTmpForHP> tmpCont(SalomeContainerTmpForHP::BuildFrom(containerCast1,reqNode));
+      objContainer=tmpCont->getContainerPtr(reqNode);
     }
-  PyGILState_Release(gstate);
+  else
+    throw YACS::Exception("Unrecognized type of container ! Salome one is expected for PythonNode/PyFuncNode !");
+  if(CORBA::is_nil(objContainer))
+    throw YACS::Exception("Container corba pointer is NULL for PythonNode !");
+  return objContainer;
+}
+
+Engines::Container_var PythonEntry::loadPythonAdapter(InlineNode *reqNode, bool& isInitializeRequested)
+{
+  bool isStandardCont(true);
+  Engines::Container_var objContainer(GetContainerObj(reqNode,isStandardCont));
+  isInitializeRequested=false;
+  try
+  {
+    Engines::PyNodeBase_var dftPyScript(retrieveDftRemotePyInterpretorIfAny(objContainer));
+    if(CORBA::is_nil(dftPyScript))
+    {
+      isInitializeRequested=!isStandardCont;
+      createRemoteAdaptedPyInterpretor(objContainer);
+    }
+    else
+      assignRemotePyInterpretor(dftPyScript);
+  }
+  catch( const SALOME::SALOME_Exception& ex )
+  {
+      std::string msg="Exception on remote python node creation ";
+      msg += '\n';
+      msg += ex.details.text.in();
+      reqNode->setErrorDetails(msg);
+      throw Exception(msg);
+  }
+  Engines::PyNodeBase_var pynode(getRemoteInterpreterHandle());
+  if(CORBA::is_nil(pynode))
+    throw Exception("In PythonNode the ref in NULL ! ");
+  return objContainer;
+}
+
+void PythonEntry::loadRemoteContext(InlineNode *reqNode, Engines::Container_ptr objContainer, bool isInitializeRequested)
+{
+  Container *container(reqNode->getContainer());
+  Engines::PyNodeBase_var pynode(getRemoteInterpreterHandle());
+  ///
+  {
+#if PY_VERSION_HEX < 0x03070000
+    std::unique_lock<std::mutex> lock(data_mutex);
+#endif
+    AutoGIL agil;
+    const char *picklizeScript(getSerializationScript());
+    PyObject *res=PyRun_String(picklizeScript,Py_file_input,_context,_context);
+    PyObject *res2(PyRun_String(SCRIPT_FOR_SIMPLE_SERIALIZATION,Py_file_input,_context,_context));
+    if(res == NULL || res2==NULL)
+      {
+        std::string errorDetails;
+        PyObject* new_stderr = newPyStdOut(errorDetails);
+        reqNode->setErrorDetails(errorDetails);
+        PySys_SetObject((char*)"stderr", new_stderr);
+        PyErr_Print();
+        PySys_SetObject((char*)"stderr", PySys_GetObject((char*)"__stderr__"));
+        Py_DECREF(new_stderr);
+        throw Exception("Error during load");
+      }
+    Py_DECREF(res); Py_DECREF(res2);
+    _pyfuncSer=PyDict_GetItemString(_context,"pickleForDistPyth2009");
+    _pyfuncUnser=PyDict_GetItemString(_context,"unPickleForDistPyth2009");
+    _pyfuncSimpleSer=PyDict_GetItemString(_context,"pickleForVarSimplePyth2009");
+    if(_pyfuncSer == NULL)
+      {
+        std::string errorDetails;
+        PyObject *new_stderr(newPyStdOut(errorDetails));
+        reqNode->setErrorDetails(errorDetails);
+        PySys_SetObject((char*)"stderr", new_stderr);
+        PyErr_Print();
+        PySys_SetObject((char*)"stderr", PySys_GetObject((char*)"__stderr__"));
+        Py_DECREF(new_stderr);
+        throw Exception("Error during load");
+      }
+    if(_pyfuncUnser == NULL)
+      {
+        std::string errorDetails;
+        PyObject *new_stderr(newPyStdOut(errorDetails));
+        reqNode->setErrorDetails(errorDetails);
+        PySys_SetObject((char*)"stderr", new_stderr);
+        PyErr_Print();
+        PySys_SetObject((char*)"stderr", PySys_GetObject((char*)"__stderr__"));
+        Py_DECREF(new_stderr);
+        throw Exception("Error during load");
+      }
+    if(_pyfuncSimpleSer == NULL)
+      {
+        std::string errorDetails;
+        PyObject *new_stderr(newPyStdOut(errorDetails));
+        reqNode->setErrorDetails(errorDetails);
+        PySys_SetObject((char*)"stderr", new_stderr);
+        PyErr_Print();
+        PySys_SetObject((char*)"stderr", PySys_GetObject((char*)"__stderr__"));
+        Py_DECREF(new_stderr);
+        throw Exception("Error during load");
+      }
+  }
+  if(isInitializeRequested)
+    {//This one is called only once at initialization in the container if an init-script is specified.
+      try
+      {
+          std::string zeInitScriptKey(container->getProperty(HomogeneousPoolContainer::INITIALIZE_SCRIPT_KEY));
+          if(!zeInitScriptKey.empty())
+            pynode->executeAnotherPieceOfCode(zeInitScriptKey.c_str());
+      }
+      catch( const SALOME::SALOME_Exception& ex )
+      {
+          std::string msg="Exception on PythonNode::loadRemote python invocation of initializisation py script !";
+          msg += '\n';
+          msg += ex.details.text.in();
+          reqNode->setErrorDetails(msg);
+          throw Exception(msg);
+      }
+      DEBTRACE( "---------------End PyNode::loadRemote function---------------" );
+    }
+}
+
+std::string PythonEntry::GetContainerLog(const std::string& mode, Container *container, const Task *askingTask)
+{
+  if(mode=="local")
+    return "";
+
+  std::string msg;
+  try
+  {
+      SalomeContainer *containerCast(dynamic_cast<SalomeContainer *>(container));
+      SalomeHPContainer *objContainer2(dynamic_cast<SalomeHPContainer *>(container));
+      if(containerCast)
+        {
+          Engines::Container_var objContainer(containerCast->getContainerPtr(askingTask));
+          CORBA::String_var logname = objContainer->logfilename();
+          DEBTRACE(logname);
+          msg=logname;
+          std::string::size_type pos = msg.find(":");
+          msg=msg.substr(pos+1);
+        }
+      else if(objContainer2)
+        {
+          msg="Remote PythonNode is on HP Container : no log because no info of the location by definition of HP Container !";
+        }
+      else
+        {
+          msg="Not implemented yet for container log for that type of container !";
+        }
+  }
+  catch(...)
+  {
+      msg = "Container no longer reachable";
+  }
+  return msg;
+}
+
+void PythonEntry::commonRemoteLoad(InlineNode *reqNode)
+{
+  loadRemoteContainer(reqNode);
+  bool isInitializeRequested;
+  Engines::Container_var objContainer(loadPythonAdapter(reqNode,isInitializeRequested));
+  loadRemoteContext(reqNode,objContainer,isInitializeRequested);
+}
+
+bool PythonEntry::hasImposedResource()const
+{
+  return !_imposedResource.empty() && !_imposedContainer.empty();
+}
+
+PythonNode::PythonNode(const PythonNode& other, ComposedNode *father):InlineNode(other,father),_autoSqueeze(other._autoSqueeze)
+{
+  _pynode = Engines::PyScriptNode::_nil();
+  _implementation=IMPL_NAME;
+  {
+    AutoGIL agil;
+    _context=PyDict_New();
+    if( PyDict_SetItemString( _context, "__builtins__", getSALOMERuntime()->getBuiltins() ))
+      {
+        stringstream msg;
+        msg << "Impossible to set builtins" << __FILE__ << ":" << __LINE__;
+        _errorDetails=msg.str();
+        throw Exception(msg.str());
+      }
+  }
+}
+
+PythonNode::PythonNode(const std::string& name):InlineNode(name)
+{
+  _pynode = Engines::PyScriptNode::_nil();
+  _implementation=IMPL_NAME;
+  {
+    AutoGIL agil;
+    _context=PyDict_New();
+    if( PyDict_SetItemString( _context, "__builtins__", getSALOMERuntime()->getBuiltins() ))
+      {
+        stringstream msg;
+        msg << "Impossible to set builtins" << __FILE__ << ":" << __LINE__;
+        _errorDetails=msg.str();
+        throw Exception(msg.str());
+      }
+  }
 }
 
 PythonNode::~PythonNode()
 {
-  PyGILState_STATE gstate = PyGILState_Ensure();
-  DEBTRACE( "_context refcnt: " << _context->ob_refcnt );
-  Py_DECREF(_context);
-  PyGILState_Release(gstate);
+  freeKernelPynode();
 }
 
-void PythonNode::checkBasicConsistency() const throw(YACS::Exception)
+void PythonNode::checkBasicConsistency() const
 {
   DEBTRACE("checkBasicConsistency");
   InlineNode::checkBasicConsistency();
-
-  PyGILState_STATE gstate = PyGILState_Ensure();
-  PyObject* res;
-  res=Py_CompileString(_script.c_str(),getName().c_str(),Py_file_input);
-  if(res == NULL)
-    {
-      std::string error="";
-      PyObject* new_stderr = newPyStdOut(error);
-      PySys_SetObject((char*)"stderr", new_stderr);
-      PyErr_Print();
-      PySys_SetObject((char*)"stderr", PySys_GetObject((char*)"__stderr__"));
-      Py_DECREF(new_stderr);
-      PyGILState_Release(gstate);
-      throw Exception(error);
-    }
-  else
-    Py_XDECREF(res);
-  PyGILState_Release(gstate);
+  {
+    AutoGIL agil;
+    PyObject* res;
+    res=Py_CompileString(_script.c_str(),getName().c_str(),Py_file_input);
+    if(res == NULL)
+      {
+        std::string error="";
+        PyObject* new_stderr = newPyStdOut(error);
+        PySys_SetObject((char*)"stderr", new_stderr);
+        PyErr_Print();
+        PySys_SetObject((char*)"stderr", PySys_GetObject((char*)"__stderr__"));
+        Py_DECREF(new_stderr);
+        throw Exception(error);
+      }
+    else
+      Py_XDECREF(res);
+  }
 }
 
 void PythonNode::load()
 {
   DEBTRACE( "---------------PyNode::load function---------------" );
-  if(_mode=="remote")
+  if(_mode==PythonNode::REMOTE_NAME)
     loadRemote();
   else
     loadLocal();
@@ -129,102 +394,12 @@ void PythonNode::loadLocal()
 
 void PythonNode::loadRemote()
 {
-  DEBTRACE( "---------------PyNode::loadRemote function---------------" );
-  if(_container)
-    {
-      if(!_container->isAlreadyStarted(0))
-        {
-          try
-            {
-              _container->start(0);
-            }
-          catch(Exception& e)
-            {
-              _errorDetails=e.what();
-              throw e;
-            }
-        }
-    }
-  else
-    {
-      std::string what("PyNode::loadRemote : a load operation requested on \"");
-      what+=_name; what+="\" with no container specified.";
-      _errorDetails=what;
-      throw Exception(what);
-    }
-
-  Engines::Container_var objContainer=((SalomeContainer*)_container)->getContainerPtr(0);
-
-  try
-    {
-      _pynode = objContainer->createPyScriptNode(getName().c_str(),getScript().c_str());
-    }
-  catch( const SALOME::SALOME_Exception& ex )
-    {
-      std::string msg="Exception on remote python node creation ";
-      msg += '\n';
-      msg += ex.details.text.in();
-      _errorDetails=msg;
-      throw Exception(msg);
-    }
-
-  PyGILState_STATE gstate = PyGILState_Ensure();
-  const char picklizeScript[]="import cPickle\n"
-                              "def pickleForDistPyth2009(kws):\n"
-                              "  return cPickle.dumps(((),kws),-1)\n"
-                              "\n"
-                              "def unPickleForDistPyth2009(st):\n"
-                              "  args=cPickle.loads(st)\n"
-                              "  return args\n";
-  PyObject *res=PyRun_String(picklizeScript,Py_file_input,_context,_context);
-  if(res == NULL)
-    {
-      _errorDetails="";
-      PyObject* new_stderr = newPyStdOut(_errorDetails);
-      PySys_SetObject((char*)"stderr", new_stderr);
-      PyErr_Print();
-      PySys_SetObject((char*)"stderr", PySys_GetObject((char*)"__stderr__"));
-      Py_DECREF(new_stderr);
-
-      PyGILState_Release(gstate);
-      throw Exception("Error during load");
-    }
-  Py_DECREF(res);
-
-  _pyfuncSer=PyDict_GetItemString(_context,"pickleForDistPyth2009");
-  _pyfuncUnser=PyDict_GetItemString(_context,"unPickleForDistPyth2009");
-  if(_pyfuncSer == NULL)
-    {
-      _errorDetails="";
-      PyObject* new_stderr = newPyStdOut(_errorDetails);
-      PySys_SetObject((char*)"stderr", new_stderr);
-      PyErr_Print();
-      PySys_SetObject((char*)"stderr", PySys_GetObject((char*)"__stderr__"));
-      Py_DECREF(new_stderr);
-
-      PyGILState_Release(gstate);
-      throw Exception("Error during load");
-    }
-  if(_pyfuncUnser == NULL)
-    {
-      _errorDetails="";
-      PyObject* new_stderr = newPyStdOut(_errorDetails);
-      PySys_SetObject((char*)"stderr", new_stderr);
-      PyErr_Print();
-      PySys_SetObject((char*)"stderr", PySys_GetObject((char*)"__stderr__"));
-      Py_DECREF(new_stderr);
-
-      PyGILState_Release(gstate);
-      throw Exception("Error during load");
-    }
-  DEBTRACE( "---------------End PyNode::loadRemote function---------------" );
-  PyGILState_Release(gstate);
-
+  commonRemoteLoad(this);
 }
 
 void PythonNode::execute()
 {
-  if(_mode=="remote")
+  if(_mode==PythonNode::REMOTE_NAME)
     executeRemote();
   else
     executeLocal();
@@ -234,48 +409,56 @@ void PythonNode::executeRemote()
 {
   DEBTRACE( "++++++++++++++ PyNode::executeRemote: " << getName() << " ++++++++++++++++++++" );
   if(!_pyfuncSer)
-    throw Exception("DistributedPythonNode badly loaded");
-  PyGILState_STATE gstate = PyGILState_Ensure();
-
-  //===========================================================================
-  // Get inputs in input ports, build a Python dict and pickle it
-  //===========================================================================
-  PyObject* ob;
-  PyObject* args = PyDict_New();
-  std::list<InputPort *>::iterator iter2;
-  int pos=0;
-  for(iter2 = _setOfInputPort.begin(); iter2 != _setOfInputPort.end(); ++iter2)
+    throw Exception("PythonNode badly loaded");
+  //
+  if(dynamic_cast<HomogeneousPoolContainer *>(getContainer()))
     {
-      InputPyPort *p=(InputPyPort *)*iter2;
-      ob=p->getPyObj();
-      PyDict_SetItemString(args,p->getName().c_str(),ob);
-      pos++;
+      bool dummy;
+      loadPythonAdapter(this,dummy);
+      _pynode->assignNewCompiledCode(getScript().c_str());
     }
+  //
+  std::unique_ptr<Engines::pickledArgs> serializationInputCorba(new Engines::pickledArgs);
+  AutoPyRef serializationInput;
+  {
+#if PY_VERSION_HEX < 0x03070000
+      std::unique_lock<std::mutex> lock(data_mutex);
+#endif
+      AutoGIL agil;
+      PyObject *args(0),*ob(0);
+      //===========================================================================
+      // Get inputs in input ports, build a Python dict and pickle it
+      //===========================================================================
+      args = PyDict_New();
+      std::list<InputPort *>::iterator iter2;
+      int pos(0);
+      for(iter2 = _setOfInputPort.begin(); iter2 != _setOfInputPort.end(); ++iter2)
+        {
+          InputPyPort *p=(InputPyPort *)*iter2;
+          ob=p->getPyObj();
+          PyDict_SetItemString(args,p->getName().c_str(),ob);
+          pos++;
+        }
 #ifdef _DEVDEBUG_
-  PyObject_Print(args,stderr,Py_PRINT_RAW);
-  std::cerr << endl;
+      PyObject_Print(args,stderr,Py_PRINT_RAW);
+      std::cerr << endl;
 #endif
-  PyObject *serializationInput=PyObject_CallFunctionObjArgs(_pyfuncSer,args,NULL);
-  //The pickled string may contain NULL characters so use PyString_AsStringAndSize
-  char* serializationInputC;
-  Py_ssize_t len;
-  if (PyString_AsStringAndSize(serializationInput, &serializationInputC, &len))
-    {
-      PyGILState_Release(gstate);
-      throw Exception("DistributedPythonNode problem in python pickle");
-    }
-  PyGILState_Release(gstate);
-
-  Engines::pickledArgs_var serializationInputCorba=new Engines::pickledArgs;
-  serializationInputCorba->length(len);
-  for(int i=0; i < len ; i++)
-    serializationInputCorba[i]=serializationInputC[i];
+      serializationInput.set(PyObject_CallFunctionObjArgs(_pyfuncSer,args,nullptr));
+      Py_DECREF(args);
+      //The pickled string may contain NULL characters so use PyString_AsStringAndSize
+      char *serializationInputC(0);
+      Py_ssize_t len;
+      if (PyBytes_AsStringAndSize(serializationInput, &serializationInputC, &len))
+        throw Exception("DistributedPythonNode problem in python pickle");
+      // no copy here. The C byte array of Python is taken  as this into CORBA sequence to avoid copy
+      serializationInputCorba.reset(new Engines::pickledArgs(len,len,reinterpret_cast<CORBA::Octet *>(serializationInputC),0));
+  }
 
   //get the list of output argument names
   std::list<OutputPort *>::iterator iter;
   Engines::listofstring myseq;
   myseq.length(getNumberOfOutputPorts());
-  pos=0;
+  int pos=0;
   for(iter = _setOfOutputPort.begin(); iter != _setOfOutputPort.end(); ++iter)
     {
       OutputPyPort *p=(OutputPyPort *)*iter;
@@ -289,222 +472,272 @@ void PythonNode::executeRemote()
   // Execute in remote Python node
   //===========================================================================
   DEBTRACE( "-----------------starting remote python invocation-----------------" );
-  Engines::pickledArgs_var resultCorba;
+  std::unique_ptr<Engines::pickledArgs> resultCorba;
   try
     {
       //pass outargsname and dict serialized
-      resultCorba=_pynode->execute(myseq,serializationInputCorba);
+      _pynode->executeFirst(*(serializationInputCorba.get()));
+      //serializationInput and serializationInputCorba are no more needed for server. Release it.
+      serializationInputCorba.reset(nullptr); serializationInput.set(nullptr);
+      resultCorba.reset(_pynode->executeSecond(myseq));
     }
   catch( const SALOME::SALOME_Exception& ex )
     {
-      std::string msg="Exception on remote python invocation";
-      msg += '\n';
-      msg += ex.details.text.in();
-      _errorDetails=msg;
-      throw Exception(msg);
+      std::ostringstream msg; msg << "Exception on remote python invocation" << std::endl << ex.details.text.in() << std::endl;
+      msg << "PyScriptNode CORBA ref : ";
+      {
+        CORBA::ORB_ptr orb(getSALOMERuntime()->getOrb());
+        if(!CORBA::is_nil(orb))
+        {
+          CORBA::String_var IOR(orb->object_to_string(_pynode));
+          msg << IOR;
+        }
+      }
+      msg << std::endl;
+      _errorDetails=msg.str();
+      throw Exception(msg.str());
     }
+//   if(!CORBA::is_nil(_pynode))
+//     {
+//       _pynode->UnRegister();
+//     }
+//   _pynode = Engines::PyScriptNode::_nil();
+//   //
+//   bool dummy;
+//   Engines::Container_var cont(GetContainerObj(this,dummy));
+//   cont->removePyScriptNode(getName().c_str());
   DEBTRACE( "-----------------end of remote python invocation-----------------" );
   //===========================================================================
   // Get results, unpickle and put them in output ports
   //===========================================================================
-  char *resultCorbaC=new char[resultCorba->length()+1];
-  resultCorbaC[resultCorba->length()]='\0';
-  for(int i=0;i<resultCorba->length();i++)
-    resultCorbaC[i]=resultCorba[i];
-
-  gstate = PyGILState_Ensure();
-
-  PyObject* resultPython=PyString_FromStringAndSize(resultCorbaC,resultCorba->length());
-  delete [] resultCorbaC;
-  args = PyTuple_New(1);
-  PyTuple_SetItem(args,0,resultPython);
-  PyObject *finalResult=PyObject_CallObject(_pyfuncUnser,args);
-  Py_DECREF(args);
-
-  if (finalResult == NULL)
+  auto length(resultCorba->length());
+  char *resultCorbaC(reinterpret_cast<char *>(resultCorba->get_buffer()));
   {
-    std::stringstream msg;
-    msg << "Conversion with pickle of output ports failed !";
-    msg << " : " << __FILE__ << ":" << __LINE__;
-    PyGILState_Release(gstate);
-    _errorDetails=msg.str();
-    throw YACS::ENGINE::ConversionException(msg.str());
-  }
-
-  DEBTRACE( "-----------------PythonNode::outputs-----------------" );
-  int nres=1;
-  if(finalResult == Py_None)
-    nres=0;
-  else if(PyTuple_Check(finalResult))
-    nres=PyTuple_Size(finalResult);
+#if PY_VERSION_HEX < 0x03070000
+      std::unique_lock<std::mutex> lock(data_mutex);
+#endif
+      AutoGIL agil;
+      PyObject *args(0),*ob(0);
+      PyObject* resultPython=PyMemoryView_FromMemory(resultCorbaC,length,PyBUF_READ);
+      args = PyTuple_New(1);
+      PyTuple_SetItem(args,0,resultPython);
+      PyObject *finalResult=PyObject_CallObject(_pyfuncUnser,args);
+      resultCorba.reset(nullptr);
+      Py_DECREF(args);
+
+      if (finalResult == NULL)
+        {
+          std::stringstream msg;
+          msg << "Conversion with pickle of output ports failed !";
+          msg << " : " << __FILE__ << ":" << __LINE__;
+          _errorDetails=msg.str();
+          throw YACS::ENGINE::ConversionException(msg.str());
+        }
 
-  if(getNumberOfOutputPorts() != nres)
-    {
-      std::string msg="Number of output arguments : Mismatch between definition and execution";
-      Py_DECREF(finalResult);
-      PyGILState_Release(gstate);
-      _errorDetails=msg;
-      throw Exception(msg);
-    }
+      DEBTRACE( "-----------------PythonNode::outputs-----------------" );
+      int nres=1;
+      if(finalResult == Py_None)
+        nres=0;
+      else if(PyTuple_Check(finalResult))
+        nres=PyTuple_Size(finalResult);
 
-  pos=0;
-  try
-    {
-      for(iter = _setOfOutputPort.begin(); iter != _setOfOutputPort.end(); ++iter)
+      if(getNumberOfOutputPorts() != nres)
         {
-          OutputPyPort *p=(OutputPyPort *)*iter;
-          DEBTRACE( "port name: " << p->getName() );
-          DEBTRACE( "port kind: " << p->edGetType()->kind() );
-          DEBTRACE( "port pos : " << pos );
-          if(PyTuple_Check(finalResult))
-            ob=PyTuple_GetItem(finalResult,pos) ;
-          else
-            ob=finalResult;
-          DEBTRACE( "ob refcnt: " << ob->ob_refcnt );
-          p->put(ob);
-          pos++;
+          std::string msg="Number of output arguments : Mismatch between definition and execution";
+          Py_DECREF(finalResult);
+          _errorDetails=msg;
+          throw Exception(msg);
         }
-      Py_DECREF(finalResult);
-    }
-  catch(ConversionException& ex)
-    {
-      Py_DECREF(finalResult);
-      PyGILState_Release(gstate);
-      _errorDetails=ex.what();
-      throw;
-    }
-
-  PyGILState_Release(gstate);
 
+      pos=0;
+      try
+      {
+          for(iter = _setOfOutputPort.begin(); iter != _setOfOutputPort.end(); ++iter)
+            {
+              OutputPyPort *p=(OutputPyPort *)*iter;
+              DEBTRACE( "port name: " << p->getName() );
+              DEBTRACE( "port kind: " << p->edGetType()->kind() );
+              DEBTRACE( "port pos : " << pos );
+              if(PyTuple_Check(finalResult))
+                ob=PyTuple_GetItem(finalResult,pos) ;
+              else
+                ob=finalResult;
+              DEBTRACE( "ob refcnt: " << ob->ob_refcnt );
+              p->put(ob);
+              pos++;
+            }
+          Py_DECREF(finalResult);
+      }
+      catch(ConversionException& ex)
+      {
+          Py_DECREF(finalResult);
+          _errorDetails=ex.what();
+          throw;
+      }
+      if(_autoSqueeze)
+        squeezeMemoryRemote();
+  }
+  //
+  if(!isUsingPythonCache())
+  {
+    freeKernelPynode();
+    bool dummy;
+    Engines::Container_var cont(GetContainerObj(this,dummy));
+    cont->removePyScriptNode(getName().c_str());
+  }
   DEBTRACE( "++++++++++++++ ENDOF PyNode::executeRemote: " << getName() << " ++++++++++++++++++++" );
 }
 
 void PythonNode::executeLocal()
 {
   DEBTRACE( "++++++++++++++ PyNode::executeLocal: " << getName() << " ++++++++++++++++++++" );
-  PyGILState_STATE gstate = PyGILState_Ensure();
-
-  DEBTRACE( "---------------PyNode::inputs---------------" );
-  list<InputPort *>::iterator iter2;
-  for(iter2 = _setOfInputPort.begin(); iter2 != _setOfInputPort.end(); iter2++)
+  {
+    AutoGIL agil;
+
+    DEBTRACE( "---------------PyNode::inputs---------------" );
+    list<InputPort *>::iterator iter2;
+    for(iter2 = _setOfInputPort.begin(); iter2 != _setOfInputPort.end(); iter2++)
+      {
+        InputPyPort *p=(InputPyPort *)*iter2;
+        DEBTRACE( "port name: " << p->getName() );
+        DEBTRACE( "port kind: " << p->edGetType()->kind() );
+        PyObject* ob=p->getPyObj();
+        DEBTRACE( "ob refcnt: " << ob->ob_refcnt );
+#ifdef _DEVDEBUG_
+        PyObject_Print(ob,stderr,Py_PRINT_RAW);
+        cerr << endl;
+#endif
+        int ier=PyDict_SetItemString(_context,p->getName().c_str(),ob);
+        DEBTRACE( "after PyDict_SetItemString:ob refcnt: " << ob->ob_refcnt );
+      }
+
+    DEBTRACE( "---------------End PyNode::inputs---------------" );
+
+    //calculation
+    DEBTRACE( "----------------PyNode::calculation---------------" );
+    DEBTRACE(  _script );
+    DEBTRACE( "_context refcnt: " << _context->ob_refcnt );
+
+    std::ostringstream stream;
+    stream << "/tmp/PythonNode_";
+    stream << getpid();
+
+    PyObject* code=Py_CompileString(_script.c_str(), stream.str().c_str(), Py_file_input);
+    if(code == NULL)
+      {
+        _errorDetails=""; 
+        PyObject* new_stderr = newPyStdOut(_errorDetails);
+        PySys_SetObject((char*)"stderr", new_stderr);
+        PyErr_Print();
+        PySys_SetObject((char*)"stderr", PySys_GetObject((char*)"__stderr__"));
+        Py_DECREF(new_stderr);
+        throw Exception("Error during execution");
+      }
+    PyObject *res = PyEval_EvalCode(  code, _context, _context);
+
+    Py_DECREF(code);
+    Py_XDECREF(res);
+    DEBTRACE( "_context refcnt: " << _context->ob_refcnt );
+    fflush(stdout);
+    fflush(stderr);
+    if(PyErr_Occurred ())
+      {
+        _errorDetails="";
+        PyObject* new_stderr = newPyStdOut(_errorDetails);
+        PySys_SetObject((char*)"stderr", new_stderr);
+        ofstream errorfile(stream.str().c_str());
+        if (errorfile.is_open())
+          {
+            errorfile << _script;
+            errorfile.close();
+          }
+        PyErr_Print();
+        PySys_SetObject((char*)"stderr", PySys_GetObject((char*)"__stderr__"));
+        Py_DECREF(new_stderr);
+        throw Exception("Error during execution");
+      }
+
+    DEBTRACE( "-----------------PyNode::outputs-----------------" );
+    list<OutputPort *>::iterator iter;
+    try
     {
-      InputPyPort *p=(InputPyPort *)*iter2;
-      DEBTRACE( "port name: " << p->getName() );
-      DEBTRACE( "port kind: " << p->edGetType()->kind() );
-      PyObject* ob=p->getPyObj();
-      DEBTRACE( "ob refcnt: " << ob->ob_refcnt );
+        for(iter = _setOfOutputPort.begin(); iter != _setOfOutputPort.end(); iter++)
+          {
+            OutputPyPort *p=(OutputPyPort *)*iter;
+            DEBTRACE( "port name: " << p->getName() );
+            DEBTRACE( "port kind: " << p->edGetType()->kind() );
+            PyObject *ob=PyDict_GetItemString(_context,p->getName().c_str());
+            if(ob==NULL)
+              {
+                std::string msg="Error during execution: there is no variable ";
+                msg=msg+p->getName()+" in node context";
+                _errorDetails=msg;
+                throw Exception(msg);
+              }
+            DEBTRACE( "PyNode::outputs::ob refcnt: " << ob->ob_refcnt );
 #ifdef _DEVDEBUG_
-      PyObject_Print(ob,stderr,Py_PRINT_RAW);
-      cerr << endl;
+            PyObject_Print(ob,stderr,Py_PRINT_RAW);
+            cerr << endl;
 #endif
-      int ier=PyDict_SetItemString(_context,p->getName().c_str(),ob);
-      DEBTRACE( "after PyDict_SetItemString:ob refcnt: " << ob->ob_refcnt );
+            p->put(ob);
+          }
     }
-  
-  DEBTRACE( "---------------End PyNode::inputs---------------" );
-  
-  //calculation
-  DEBTRACE( "----------------PyNode::calculation---------------" );
-  DEBTRACE(  _script );
-  DEBTRACE( "_context refcnt: " << _context->ob_refcnt );
-
-  std::ostringstream stream;
-  stream << "/tmp/PythonNode_";
-  stream << getpid();
-
-  PyObject* code=Py_CompileString(_script.c_str(), stream.str().c_str(), Py_file_input);
-  if(code == NULL)
+    catch(ConversionException& ex)
     {
-      _errorDetails="";
-      PyObject* new_stderr = newPyStdOut(_errorDetails);
-      PySys_SetObject((char*)"stderr", new_stderr);
-      PyErr_Print();
-      PySys_SetObject((char*)"stderr", PySys_GetObject((char*)"__stderr__"));
-      Py_DECREF(new_stderr);
-      PyGILState_Release(gstate);
-      throw Exception("Error during execution");
+        _errorDetails=ex.what();
+        throw;
     }
-  PyObject *res = PyEval_EvalCode((PyCodeObject *)code, _context, _context);
-  Py_DECREF(code);
-  DEBTRACE( "_context refcnt: " << _context->ob_refcnt );
-  fflush(stdout);
-  fflush(stderr);
-  if(res == NULL)
-    {
-      _errorDetails="";
-      PyObject* new_stderr = newPyStdOut(_errorDetails);
-      PySys_SetObject((char*)"stderr", new_stderr);
-      ofstream errorfile(stream.str().c_str());
-      if (errorfile.is_open())
-        {
-          errorfile << _script;
-          errorfile.close();
-        }
-      PyErr_Print();
-      PySys_SetObject((char*)"stderr", PySys_GetObject((char*)"__stderr__"));
-      Py_DECREF(new_stderr);
+    if(_autoSqueeze)
+      squeezeMemory();
+    DEBTRACE( "-----------------End PyNode::outputs-----------------" );
+  }
+  DEBTRACE( "++++++++++++++ End PyNode::execute: " << getName() << " ++++++++++++++++++++" );
+}
 
-      PyGILState_Release(gstate);
-      throw Exception("Error during execution");
-    }
-  Py_DECREF(res);
+void PythonNode::squeezeMemorySafe()
+{
+  AutoGIL agil;
+  if(_mode==PythonNode::REMOTE_NAME)
+    this->squeezeMemoryRemote();
+  else
+    this->squeezeMemory();
+}
   
-  DEBTRACE( "-----------------PyNode::outputs-----------------" );
-  list<OutputPort *>::iterator iter;
-  try
+void PythonNode::squeezeMemory()
+{
+  for(auto p : _setOfInputPort)
     {
-      for(iter = _setOfOutputPort.begin(); iter != _setOfOutputPort.end(); iter++)
-        {
-          OutputPyPort *p=(OutputPyPort *)*iter;
-          DEBTRACE( "port name: " << p->getName() );
-          DEBTRACE( "port kind: " << p->edGetType()->kind() );
-          PyObject *ob=PyDict_GetItemString(_context,p->getName().c_str());
-          if(ob==NULL){
-             PyGILState_Release(gstate);
-             std::string msg="Error during execution: there is no variable ";
-             msg=msg+p->getName()+" in node context";
-             _errorDetails=msg;
-             throw Exception(msg);
-          }
-          DEBTRACE( "PyNode::outputs::ob refcnt: " << ob->ob_refcnt );
-#ifdef _DEVDEBUG_
-          PyObject_Print(ob,stderr,Py_PRINT_RAW);
-          cerr << endl;
-#endif
-          p->put(ob);
-        }
+      PyDict_DelItemString(_context,p->getName().c_str());
+      InputPyPort *p2(static_cast<InputPyPort *>(p));
+      if(p2->canSafelySqueezeMemory())
+        p2->put(Py_None);
     }
-  catch(ConversionException& ex)
+  for(auto p : _setOfOutputPort)
     {
-      PyGILState_Release(gstate);
-      _errorDetails=ex.what();
-      throw;
+      PyDict_DelItemString(_context,p->getName().c_str());
+      OutputPyPort *p2(static_cast<OutputPyPort *>(p));
+      p2->putWithoutForward(Py_None);
     }
-
-  DEBTRACE( "-----------------End PyNode::outputs-----------------" );
-  PyGILState_Release(gstate);
-  DEBTRACE( "++++++++++++++ End PyNode::execute: " << getName() << " ++++++++++++++++++++" );
 }
 
-std::string PythonNode::getContainerLog()
+void PythonNode::squeezeMemoryRemote()
 {
-  if(_mode=="local")return "";
-
-  std::string msg;
-  try
+  for(auto p : _setOfInputPort)
     {
-      Engines::Container_var objContainer=((SalomeContainer*)_container)->getContainerPtr(0);
-      CORBA::String_var logname = objContainer->logfilename();
-      DEBTRACE(logname);
-      msg=logname;
-      std::string::size_type pos = msg.find(":");
-      msg=msg.substr(pos+1);
+      InputPyPort *p2(static_cast<InputPyPort *>(p));
+      if(p2->canSafelySqueezeMemory())
+        p2->put(Py_None);
     }
-  catch(...)
+  for(auto p : _setOfOutputPort)
     {
-      msg = "Container no longer reachable";
+      OutputPyPort *p2(static_cast<OutputPyPort *>(p));
+      p2->putWithoutForward(Py_None);
     }
-  return msg;
+}
+
+std::string PythonNode::getContainerLog()
+{
+  return PythonEntry::GetContainerLog(_mode,_container,this);
 }
 
 void PythonNode::shutdown(int level)
@@ -513,17 +746,106 @@ void PythonNode::shutdown(int level)
   if(_mode=="local")return;
   if(_container)
     {
-      if(!CORBA::is_nil(_pynode)) _pynode->UnRegister();
-      _pynode=Engines::PyScriptNode::_nil();
+      freeKernelPynode();
       _container->shutdown(level);
     }
 }
 
+void PythonNode::imposeResource(const std::string& resource_name,
+                                const std::string& container_name)
+{
+  if(!resource_name.empty() && !container_name.empty())
+  {
+    _imposedResource = resource_name;
+    _imposedContainer = container_name;
+  }
+}
+
+bool PythonNode::canAcceptImposedResource()
+{
+  return _container != nullptr && _container->canAcceptImposedResource();
+}
+
+bool PythonNode::hasImposedResource()const
+{
+  return PythonEntry::hasImposedResource();
+}
+
+std::string PythonNode::pythonEntryName()const
+{
+  if(isUsingPythonCache())
+    return "DEFAULT_NAME_FOR_UNIQUE_PYTHON_NODE_ENTRY";
+  else
+    return getName();
+}
+
+bool PythonNode::isUsingPythonCache()const
+{
+  bool found = false;
+  if(_container)
+    found = _container->isUsingPythonCache();
+  return found;
+}
+
+void PythonNode::freeKernelPynode()
+{
+  if(!CORBA::is_nil(_pynode))
+  {
+    try
+    {
+      _pynode->UnRegister();
+    }
+    catch(...)
+    {
+      DEBTRACE("Trouble when pynode->UnRegister!")
+    }
+    _pynode = Engines::PyScriptNode::_nil();
+  }
+}
+
 Node *PythonNode::simpleClone(ComposedNode *father, bool editionOnly) const
 {
   return new PythonNode(*this,father);
 }
 
+void PythonNode::createRemoteAdaptedPyInterpretor(Engines::Container_ptr objContainer)
+{
+  freeKernelPynode();
+  _pynode=objContainer->createPyScriptNode(pythonEntryName().c_str(),getScript().c_str());
+  _pynode->Register();
+}
+
+Engines::PyNodeBase_var PythonNode::retrieveDftRemotePyInterpretorIfAny(Engines::Container_ptr objContainer) const
+{
+  Engines::PyScriptNode_var ret(objContainer->getDefaultPyScriptNode(pythonEntryName().c_str()));
+  if(!CORBA::is_nil(ret))
+    {
+      ret->Register();
+    }
+  return Engines::PyNodeBase::_narrow(ret);
+}
+
+void PythonNode::assignRemotePyInterpretor(Engines::PyNodeBase_var remoteInterp)
+{
+  if(CORBA::is_nil(_pynode))
+    _pynode=Engines::PyScriptNode::_narrow(remoteInterp);
+  else
+  {
+    Engines::PyScriptNode_var tmpp(Engines::PyScriptNode::_narrow(remoteInterp));
+    if(!_pynode->_is_equivalent(tmpp))
+    {
+      freeKernelPynode();
+      _pynode=Engines::PyScriptNode::_narrow(remoteInterp);
+    }
+  }
+  _pynode->assignNewCompiledCode(getScript().c_str());
+}
+
+Engines::PyNodeBase_var PythonNode::getRemoteInterpreterHandle()
+{
+  return Engines::PyNodeBase::_narrow(_pynode);
+}
+
 //! Create a new node of same type with a given name
 PythonNode* PythonNode::cloneNode(const std::string& name)
 {
@@ -548,21 +870,67 @@ PythonNode* PythonNode::cloneNode(const std::string& name)
   return n;
 }
 
-PyFuncNode::PyFuncNode(const PyFuncNode& other, ComposedNode *father):InlineFuncNode(other,father),_pyfunc(0)
+void PythonNode::applyDPLScope(ComposedNode *gfn)
 {
-  _implementation = PythonNode::IMPL_NAME;
-  PyGILState_STATE gstate = PyGILState_Ensure();
-  _context=PyDict_New();
-  DEBTRACE( "_context refcnt: " << _context->ob_refcnt );
-  if( PyDict_SetItemString( _context, "__builtins__", getSALOMERuntime()->getBuiltins() ))
+  std::vector< std::pair<std::string,int> > ret(getDPLScopeInfo(gfn));
+  if(ret.empty())
+    return ;
+  //
+  PyObject *ob(0);
+  {
+    AutoGIL agil;
+    std::size_t sz(ret.size());
+    ob=PyList_New(sz);
+    for(std::size_t i=0;i<sz;i++)
+      {
+        const std::pair<std::string,int>& p(ret[i]);
+        PyObject *elt(PyTuple_New(2));
+        PyTuple_SetItem(elt,0,PyUnicode_FromString(p.first.c_str()));
+        PyTuple_SetItem(elt,1,PyLong_FromLong(p.second));
+        PyList_SetItem(ob,i,elt);
+      }
+  }
+  if(_mode==REMOTE_NAME)
     {
-      stringstream msg;
-      msg << "Not possible to set builtins" << __FILE__ << ":" << __LINE__;
-      _errorDetails=msg.str();
-      PyGILState_Release(gstate);
-      throw Exception(msg.str());
+      Engines::pickledArgs_var serializationInputCorba(new Engines::pickledArgs);
+      {
+        AutoGIL agil;
+        PyObject *serializationInput(PyObject_CallFunctionObjArgs(_pyfuncSimpleSer,ob,NULL));
+        Py_XDECREF(ob);
+        char *serializationInputC(0);
+        Py_ssize_t len;
+        if (PyBytes_AsStringAndSize(serializationInput, &serializationInputC, &len))
+          throw Exception("DistributedPythonNode problem in python pickle");
+        serializationInputCorba->length(len);
+        for(int i=0; i < len ; i++)
+          serializationInputCorba[i]=serializationInputC[i];
+        Py_XDECREF(serializationInput);
+      }
+      _pynode->defineNewCustomVar(DPL_INFO_NAME,serializationInputCorba);
+    }
+  else
+    {
+      AutoGIL agil;
+      PyDict_SetItemString(_context,DPL_INFO_NAME,ob);
+      Py_XDECREF(ob);
     }
-  PyGILState_Release(gstate);
+}
+
+PyFuncNode::PyFuncNode(const PyFuncNode& other, ComposedNode *father):InlineFuncNode(other,father),_pyfunc(0)
+{
+  _implementation = PythonNode::IMPL_NAME;
+  {
+    AutoGIL agil;
+    _context=PyDict_New();
+    DEBTRACE( "_context refcnt: " << _context->ob_refcnt );
+    if( PyDict_SetItemString( _context, "__builtins__", getSALOMERuntime()->getBuiltins() ))
+      {
+        stringstream msg;
+        msg << "Not possible to set builtins" << __FILE__ << ":" << __LINE__;
+        _errorDetails=msg.str();
+        throw Exception(msg.str());
+      }
+  }
 }
 
 PyFuncNode::PyFuncNode(const std::string& name): InlineFuncNode(name),_pyfunc(0)
@@ -570,62 +938,69 @@ PyFuncNode::PyFuncNode(const std::string& name): InlineFuncNode(name),_pyfunc(0)
 
   _implementation = PythonNode::IMPL_NAME;
   DEBTRACE( "PyFuncNode::PyFuncNode " << name );
-  PyGILState_STATE gstate = PyGILState_Ensure();
-  _context=PyDict_New();
-  DEBTRACE( "_context refcnt: " << _context->ob_refcnt );
-  if( PyDict_SetItemString( _context, "__builtins__", getSALOMERuntime()->getBuiltins() ))
-    {
-      stringstream msg;
-      msg << "Not possible to set builtins" << __FILE__ << ":" << __LINE__;
-      _errorDetails=msg.str();
-      PyGILState_Release(gstate);
-      throw Exception(msg.str());
-    }
-  PyGILState_Release(gstate);
+  {
+    AutoGIL agil;
+    _context=PyDict_New();
+    DEBTRACE( "_context refcnt: " << _context->ob_refcnt );
+    if( PyDict_SetItemString( _context, "__builtins__", getSALOMERuntime()->getBuiltins() ))
+      {
+        stringstream msg;
+        msg << "Not possible to set builtins" << __FILE__ << ":" << __LINE__;
+        _errorDetails=msg.str();
+        throw Exception(msg.str());
+      }
+  }
 }
 
 PyFuncNode::~PyFuncNode()
 {
-  DEBTRACE( getName() );
-  PyGILState_STATE gstate = PyGILState_Ensure();
-  DEBTRACE( "_context refcnt: " << _context->ob_refcnt );
-  if(_pyfunc)DEBTRACE( "_pyfunc refcnt: " << _pyfunc->ob_refcnt );
-  Py_DECREF(_context);
-  PyGILState_Release(gstate);
   if(!CORBA::is_nil(_pynode))
     {
       _pynode->UnRegister();
     }
 }
 
-void PyFuncNode::checkBasicConsistency() const throw(YACS::Exception)
+void PyFuncNode::init(bool start)
 {
-  DEBTRACE("checkBasicConsistency");
-  InlineFuncNode::checkBasicConsistency();
-
-  PyGILState_STATE gstate = PyGILState_Ensure();
-  PyObject* res;
-  res=Py_CompileString(_script.c_str(),getName().c_str(),Py_file_input);
-  if(res == NULL)
+  initCommonPartWithoutStateManagement(start);
+  if(_state == YACS::DISABLED)
     {
-      std::string error="";
-      PyObject* new_stderr = newPyStdOut(error);
-      PySys_SetObject((char*)"stderr", new_stderr);
-      PyErr_Print();
-      PySys_SetObject((char*)"stderr", PySys_GetObject((char*)"__stderr__"));
-      Py_DECREF(new_stderr);
-      PyGILState_Release(gstate);
-      throw Exception(error);
+      exDisabledState(); // to refresh propagation of DISABLED state
+      return ;
     }
-  else
-    Py_XDECREF(res);
-  PyGILState_Release(gstate);
+  if(start) //complete initialization
+    setState(YACS::READY);
+  else if(_state > YACS::LOADED)// WARNING FuncNode has internal vars (CEA usecase) ! Partial initialization (inside a loop). Exclusivity of funcNode.
+    setState(YACS::TORECONNECT);
+}
+
+void PyFuncNode::checkBasicConsistency() const
+{
+  DEBTRACE("checkBasicConsistency");
+  InlineFuncNode::checkBasicConsistency();
+  {
+    AutoGIL agil;
+    PyObject* res;
+    res=Py_CompileString(_script.c_str(),getName().c_str(),Py_file_input);
+    if(res == NULL)
+      {
+        std::string error="";
+        PyObject* new_stderr = newPyStdOut(error);
+        PySys_SetObject((char*)"stderr", new_stderr);
+        PyErr_Print();
+        PySys_SetObject((char*)"stderr", PySys_GetObject((char*)"__stderr__"));
+        Py_DECREF(new_stderr);
+        throw Exception(error);
+      }
+    else
+      Py_XDECREF(res);
+  }
 }
 
 void PyFuncNode::load()
 {
   DEBTRACE( "---------------PyfuncNode::load function---------------" );
-  if(_mode=="remote")
+  if(_mode==PythonNode::REMOTE_NAME)
     loadRemote();
   else
     loadLocal();
@@ -633,95 +1008,7 @@ void PyFuncNode::load()
 
 void PyFuncNode::loadRemote()
 {
-  DEBTRACE( "---------------PyfuncNode::loadRemote function---------------" );
-  if(_container)
-    {
-      if(!_container->isAlreadyStarted(0))
-        {
-          try
-            {
-              _container->start(0);
-            }
-          catch(Exception& e)
-            {
-              _errorDetails=e.what();
-              throw e;
-            }
-        }
-    }
-  else
-    {
-      std::string what("PyFuncNode::loadRemote : a load operation requested on \"");
-      what+=_name; what+="\" with no container specified.";
-      _errorDetails=what;
-      throw Exception(what);
-    }
-
-  Engines::Container_var objContainer=((SalomeContainer*)_container)->getContainerPtr(0);
-  try
-    {
-      _pynode = objContainer->createPyNode(getName().c_str(),getScript().c_str());
-    }
-  catch( const SALOME::SALOME_Exception& ex )
-    {
-      std::string msg="Exception on remote python node creation ";
-      msg += '\n';
-      msg += ex.details.text.in();
-      _errorDetails=msg;
-      throw Exception(msg);
-    }
-
-  PyGILState_STATE gstate = PyGILState_Ensure();
-  const char picklizeScript[]="import cPickle\n"
-                              "def pickleForDistPyth2009(*args,**kws):\n"
-                              "  return cPickle.dumps((args,kws),-1)\n"
-                              "\n"
-                              "def unPickleForDistPyth2009(st):\n"
-                              "  args=cPickle.loads(st)\n"
-                              "  return args\n";
-  PyObject *res=PyRun_String(picklizeScript,Py_file_input,_context,_context);
-  if(res == NULL)
-    {
-      _errorDetails="";
-      PyObject* new_stderr = newPyStdOut(_errorDetails);
-      PySys_SetObject((char*)"stderr", new_stderr);
-      PyErr_Print();
-      PySys_SetObject((char*)"stderr", PySys_GetObject((char*)"__stderr__"));
-      Py_DECREF(new_stderr);
-
-      PyGILState_Release(gstate);
-      throw Exception("Error during load");
-    }
-  Py_DECREF(res);
-
-  _pyfuncSer=PyDict_GetItemString(_context,"pickleForDistPyth2009");
-  _pyfuncUnser=PyDict_GetItemString(_context,"unPickleForDistPyth2009");
-  if(_pyfuncSer == NULL)
-    {
-      _errorDetails="";
-      PyObject* new_stderr = newPyStdOut(_errorDetails);
-      PySys_SetObject((char*)"stderr", new_stderr);
-      PyErr_Print();
-      PySys_SetObject((char*)"stderr", PySys_GetObject((char*)"__stderr__"));
-      Py_DECREF(new_stderr);
-
-      PyGILState_Release(gstate);
-      throw Exception("Error during load");
-    }
-  if(_pyfuncUnser == NULL)
-    {
-      _errorDetails="";
-      PyObject* new_stderr = newPyStdOut(_errorDetails);
-      PySys_SetObject((char*)"stderr", new_stderr);
-      PyErr_Print();
-      PySys_SetObject((char*)"stderr", PySys_GetObject((char*)"__stderr__"));
-      Py_DECREF(new_stderr);
-
-      PyGILState_Release(gstate);
-      throw Exception("Error during load");
-    }
-  DEBTRACE( "---------------End PyfuncNode::loadRemote function---------------" );
-  PyGILState_Release(gstate);
+  commonRemoteLoad(this);
 }
 
 void PyFuncNode::loadLocal()
@@ -739,70 +1026,66 @@ void PyFuncNode::loadLocal()
     }
 #endif
 
-  PyGILState_STATE gstate = PyGILState_Ensure();
-  DEBTRACE( "_context refcnt: " << _context->ob_refcnt );
-
-  std::ostringstream stream;
-  stream << "/tmp/PythonNode_";
-  stream << getpid();
-
-  PyObject* code=Py_CompileString(_script.c_str(), stream.str().c_str(), Py_file_input);
-  if(code == NULL)
-    {
-      _errorDetails="";
-      PyObject* new_stderr = newPyStdOut(_errorDetails);
-      PySys_SetObject((char*)"stderr", new_stderr);
-      PyErr_Print();
-      PySys_SetObject((char*)"stderr", PySys_GetObject((char*)"__stderr__"));
-      Py_DECREF(new_stderr);
-      PyGILState_Release(gstate);
-      throw Exception("Error during execution");
-    }
-  PyObject *res = PyEval_EvalCode((PyCodeObject *)code, _context, _context);
-  Py_DECREF(code);
-
-  DEBTRACE( "_context refcnt: " << _context->ob_refcnt );
-  if(res == NULL)
-    {
-      _errorDetails="";
-      PyObject* new_stderr = newPyStdOut(_errorDetails);
-      PySys_SetObject((char*)"stderr", new_stderr);
-      ofstream errorfile(stream.str().c_str());
-      if (errorfile.is_open())
-        {
-          errorfile << _script;
-          errorfile.close();
-        }
-      PyErr_Print();
-      PySys_SetObject((char*)"stderr", PySys_GetObject((char*)"__stderr__"));
-      Py_DECREF(new_stderr);
+  {
+    AutoGIL agil;
+    DEBTRACE( "_context refcnt: " << _context->ob_refcnt );
+
+    std::ostringstream stream;
+    stream << "/tmp/PythonNode_";
+    stream << getpid();
+
+    PyObject* code=Py_CompileString(_script.c_str(), stream.str().c_str(), Py_file_input);
+    if(code == NULL)
+      {
+        _errorDetails="";
+        PyObject* new_stderr = newPyStdOut(_errorDetails);
+        PySys_SetObject((char*)"stderr", new_stderr);
+        PyErr_Print();
+        PySys_SetObject((char*)"stderr", PySys_GetObject((char*)"__stderr__"));
+        Py_DECREF(new_stderr);
+        throw Exception("Error during execution");
+      }
+    PyObject *res = PyEval_EvalCode( code, _context, _context);
+    Py_DECREF(code);
+    Py_XDECREF(res);
 
-      PyGILState_Release(gstate);
-      throw Exception("Error during execution");
-      return;
-    }
-  Py_DECREF(res);
-  _pyfunc=PyDict_GetItemString(_context,_fname.c_str());
-  DEBTRACE( "_pyfunc refcnt: " << _pyfunc->ob_refcnt );
-  if(_pyfunc == NULL)
-    {
-      _errorDetails="";
-      PyObject* new_stderr = newPyStdOut(_errorDetails);
-      PySys_SetObject((char*)"stderr", new_stderr);
-      PyErr_Print();
-      PySys_SetObject((char*)"stderr", PySys_GetObject((char*)"__stderr__"));
-      Py_DECREF(new_stderr);
-
-      PyGILState_Release(gstate);
-      throw Exception("Error during execution");
-    }
-  DEBTRACE( "---------------End PyFuncNode::load function---------------" );
-  PyGILState_Release(gstate);
+    DEBTRACE( "_context refcnt: " << _context->ob_refcnt );
+    if(PyErr_Occurred ())
+      {
+        _errorDetails="";
+        PyObject* new_stderr = newPyStdOut(_errorDetails);
+        PySys_SetObject((char*)"stderr", new_stderr);
+        ofstream errorfile(stream.str().c_str());
+        if (errorfile.is_open())
+          {
+            errorfile << _script;
+            errorfile.close();
+          }
+        PyErr_Print();
+        PySys_SetObject((char*)"stderr", PySys_GetObject((char*)"__stderr__"));
+        Py_DECREF(new_stderr);
+        throw Exception("Error during execution");
+        return;
+      }
+    _pyfunc=PyDict_GetItemString(_context,_fname.c_str());
+    DEBTRACE( "_pyfunc refcnt: " << _pyfunc->ob_refcnt );
+    if(_pyfunc == NULL)
+      {
+        _errorDetails="";
+        PyObject* new_stderr = newPyStdOut(_errorDetails);
+        PySys_SetObject((char*)"stderr", new_stderr);
+        PyErr_Print();
+        PySys_SetObject((char*)"stderr", PySys_GetObject((char*)"__stderr__"));
+        Py_DECREF(new_stderr);
+        throw Exception("Error during execution");
+      }
+    DEBTRACE( "---------------End PyFuncNode::load function---------------" );
+  }
 }
 
 void PyFuncNode::execute()
 {
-  if(_mode=="remote")
+  if(_mode==PythonNode::REMOTE_NAME)
     executeRemote();
   else
     executeLocal();
@@ -813,42 +1096,50 @@ void PyFuncNode::executeRemote()
   DEBTRACE( "++++++++++++++ PyFuncNode::executeRemote: " << getName() << " ++++++++++++++++++++" );
   if(!_pyfuncSer)
     throw Exception("DistributedPythonNode badly loaded");
-  PyGILState_STATE gstate = PyGILState_Ensure();
-
-  //===========================================================================
-  // Get inputs in input ports, build a Python tuple and pickle it
-  //===========================================================================
-  PyObject* ob;
-  PyObject* args = PyTuple_New(getNumberOfInputPorts());
-  std::list<InputPort *>::iterator iter2;
-  int pos=0;
-  for(iter2 = _setOfInputPort.begin(); iter2 != _setOfInputPort.end(); ++iter2)
+  //
+  if(dynamic_cast<HomogeneousPoolContainer *>(getContainer()))
     {
-      InputPyPort *p=(InputPyPort *)*iter2;
-      ob=p->getPyObj();
-      Py_INCREF(ob);
-      PyTuple_SetItem(args,pos,ob);
-      pos++;
+      bool dummy;
+      loadPythonAdapter(this,dummy);
+      _pynode->executeAnotherPieceOfCode(getScript().c_str());
     }
+  //
+  Engines::pickledArgs_var serializationInputCorba(new Engines::pickledArgs);;
+  {
+#if PY_VERSION_HEX < 0x03070000
+      std::unique_lock<std::mutex> lock(data_mutex);
+#endif
+      AutoGIL agil;
+      PyObject *ob(0);
+      //===========================================================================
+      // Get inputs in input ports, build a Python tuple and pickle it
+      //===========================================================================
+      PyObject *args(PyTuple_New(getNumberOfInputPorts()));
+      int pos(0);
+      for(std::list<InputPort *>::iterator iter2 = _setOfInputPort.begin(); iter2 != _setOfInputPort.end(); iter2++,pos++)
+        {
+          InputPyPort *p=(InputPyPort *)*iter2;
+          ob=p->getPyObj();
+          Py_INCREF(ob);
+          PyTuple_SetItem(args,pos,ob);
+        }
 #ifdef _DEVDEBUG_
-  PyObject_Print(args,stderr,Py_PRINT_RAW);
-  std::cerr << endl;
+      PyObject_Print(args,stderr,Py_PRINT_RAW);
+      std::cerr << endl;
 #endif
-  PyObject *serializationInput=PyObject_CallObject(_pyfuncSer,args);
-  //The pickled string may contain NULL characters so use PyString_AsStringAndSize
-  char* serializationInputC;
-  Py_ssize_t len;
-  if (PyString_AsStringAndSize(serializationInput, &serializationInputC, &len))
-    {
-      PyGILState_Release(gstate);
-      throw Exception("DistributedPythonNode problem in python pickle");
-    }
-  PyGILState_Release(gstate);
-
-  Engines::pickledArgs_var serializationInputCorba=new Engines::pickledArgs;
-  serializationInputCorba->length(len);
-  for(int i=0; i < len ; i++)
-    serializationInputCorba[i]=serializationInputC[i];
+      PyObject *serializationInput=PyObject_CallObject(_pyfuncSer,args);
+      Py_DECREF(args);
+      //The pickled string may contain NULL characters so use PyString_AsStringAndSize
+      char *serializationInputC(0);
+      Py_ssize_t len;
+      if (PyBytes_AsStringAndSize(serializationInput, &serializationInputC, &len))
+        throw Exception("DistributedPythonNode problem in python pickle");
+
+      serializationInputCorba->length(len);
+      for(int i=0; i < len ; i++)
+        serializationInputCorba[i]=serializationInputC[i];
+      Py_DECREF(serializationInput);
+  }
 
   //===========================================================================
   // Execute in remote Python node
@@ -876,60 +1167,59 @@ void PyFuncNode::executeRemote()
   for(int i=0;i<resultCorba->length();i++)
     resultCorbaC[i]=resultCorba[i];
 
-  gstate = PyGILState_Ensure();
-
-  PyObject* resultPython=PyString_FromStringAndSize(resultCorbaC,resultCorba->length());
-  delete [] resultCorbaC;
-  args = PyTuple_New(1);
-  PyTuple_SetItem(args,0,resultPython);
-  PyObject *finalResult=PyObject_CallObject(_pyfuncUnser,args);
-  Py_DECREF(args);
-
-  DEBTRACE( "-----------------PythonNode::outputs-----------------" );
-  int nres=1;
-  if(finalResult == Py_None)
-    nres=0;
-  else if(PyTuple_Check(finalResult))
-    nres=PyTuple_Size(finalResult);
-
-  if(getNumberOfOutputPorts() != nres)
-    {
-      std::string msg="Number of output arguments : Mismatch between definition and execution";
-      Py_DECREF(finalResult);
-      PyGILState_Release(gstate);
-      _errorDetails=msg;
-      throw Exception(msg);
-    }
-
-  pos=0;
-  std::list<OutputPort *>::iterator iter;
-  try
-    {
-      for(iter = _setOfOutputPort.begin(); iter != _setOfOutputPort.end(); ++iter)
+  {
+#if PY_VERSION_HEX < 0x03070000
+      std::unique_lock<std::mutex> lock(data_mutex);
+#endif
+      AutoGIL agil;
+
+      PyObject *resultPython(PyBytes_FromStringAndSize(resultCorbaC,resultCorba->length()));
+      delete [] resultCorbaC;
+      PyObject *args(PyTuple_New(1)),*ob(0);
+      PyTuple_SetItem(args,0,resultPython);
+      PyObject *finalResult=PyObject_CallObject(_pyfuncUnser,args);
+      Py_DECREF(args);
+
+      DEBTRACE( "-----------------PythonNode::outputs-----------------" );
+      int nres=1;
+      if(finalResult == Py_None)
+        nres=0;
+      else if(PyTuple_Check(finalResult))
+        nres=PyTuple_Size(finalResult);
+
+      if(getNumberOfOutputPorts() != nres)
         {
-          OutputPyPort *p=(OutputPyPort *)*iter;
-          DEBTRACE( "port name: " << p->getName() );
-          DEBTRACE( "port kind: " << p->edGetType()->kind() );
-          DEBTRACE( "port pos : " << pos );
-          if(PyTuple_Check(finalResult))
-            ob=PyTuple_GetItem(finalResult,pos) ;
-          else 
-            ob=finalResult;
-          DEBTRACE( "ob refcnt: " << ob->ob_refcnt );
-          p->put(ob);
-          pos++;
+          std::string msg="Number of output arguments : Mismatch between definition and execution";
+          Py_DECREF(finalResult);
+          _errorDetails=msg;
+          throw Exception(msg);
         }
-      Py_DECREF(finalResult);
-    }
-  catch(ConversionException& ex)
-    {
-      Py_DECREF(finalResult);
-      PyGILState_Release(gstate);
-      _errorDetails=ex.what();
-      throw;
-    }
 
-  PyGILState_Release(gstate);
+      try
+      {
+          int pos(0);
+          for(std::list<OutputPort *>::iterator iter = _setOfOutputPort.begin(); iter != _setOfOutputPort.end(); iter++, pos++)
+            {
+              OutputPyPort *p=(OutputPyPort *)*iter;
+              DEBTRACE( "port name: " << p->getName() );
+              DEBTRACE( "port kind: " << p->edGetType()->kind() );
+              DEBTRACE( "port pos : " << pos );
+              if(PyTuple_Check(finalResult))
+                ob=PyTuple_GetItem(finalResult,pos) ;
+              else
+                ob=finalResult;
+              DEBTRACE( "ob refcnt: " << ob->ob_refcnt );
+              p->put(ob);
+            }
+          Py_DECREF(finalResult);
+      }
+      catch(ConversionException& ex)
+      {
+          Py_DECREF(finalResult);
+          _errorDetails=ex.what();
+          throw;
+      }
+  }
 
   DEBTRACE( "++++++++++++++ ENDOF PyFuncNode::executeRemote: " << getName() << " ++++++++++++++++++++" );
 }
@@ -941,117 +1231,112 @@ void PyFuncNode::executeLocal()
   int pos=0;
   PyObject* ob;
   if(!_pyfunc)throw Exception("PyFuncNode badly loaded");
-  PyGILState_STATE gstate = PyGILState_Ensure();
-
-  DEBTRACE( "---------------PyFuncNode::inputs---------------" );
-  PyObject* args = PyTuple_New(getNumberOfInputPorts()) ;
-  list<InputPort *>::iterator iter2;
-  for(iter2 = _setOfInputPort.begin(); iter2 != _setOfInputPort.end(); iter2++)
-    {
-      InputPyPort *p=(InputPyPort *)*iter2;
-      DEBTRACE( "port name: " << p->getName() );
-      DEBTRACE( "port kind: " << p->edGetType()->kind() );
-      ob=p->getPyObj();
+  {
+      AutoGIL agil;
+      DEBTRACE( "---------------PyFuncNode::inputs---------------" );
+      PyObject* args = PyTuple_New(getNumberOfInputPorts()) ;
+      list<InputPort *>::iterator iter2;
+      for(iter2 = _setOfInputPort.begin(); iter2 != _setOfInputPort.end(); iter2++)
+        {
+          InputPyPort *p=(InputPyPort *)*iter2;
+          DEBTRACE( "port name: " << p->getName() );
+          DEBTRACE( "port kind: " << p->edGetType()->kind() );
+          ob=p->getPyObj();
 #ifdef _DEVDEBUG_
-      PyObject_Print(ob,stderr,Py_PRINT_RAW);
-      cerr << endl;
+          PyObject_Print(ob,stderr,Py_PRINT_RAW);
+          cerr << endl;
 #endif
-      DEBTRACE( "ob refcnt: " << ob->ob_refcnt );
-      Py_INCREF(ob);
-      PyTuple_SetItem(args,pos,ob);
-      DEBTRACE( "ob refcnt: " << ob->ob_refcnt );
-      pos++;
-    }
-  DEBTRACE( "---------------End PyFuncNode::inputs---------------" );
+          DEBTRACE( "ob refcnt: " << ob->ob_refcnt );
+          Py_INCREF(ob);
+          PyTuple_SetItem(args,pos,ob);
+          DEBTRACE( "ob refcnt: " << ob->ob_refcnt );
+          pos++;
+        }
+      DEBTRACE( "---------------End PyFuncNode::inputs---------------" );
 
-  DEBTRACE( "----------------PyFuncNode::calculation---------------" );
+      DEBTRACE( "----------------PyFuncNode::calculation---------------" );
 #ifdef _DEVDEBUG_
-  PyObject_Print(_pyfunc,stderr,Py_PRINT_RAW);
-  cerr << endl;
-  PyObject_Print(args,stderr,Py_PRINT_RAW);
-  cerr << endl;
+      PyObject_Print(_pyfunc,stderr,Py_PRINT_RAW);
+      cerr << endl;
+      PyObject_Print(args,stderr,Py_PRINT_RAW);
+      cerr << endl;
 #endif
-  DEBTRACE( "_pyfunc refcnt: " << _pyfunc->ob_refcnt );
-  PyObject* result = PyObject_CallObject( _pyfunc , args ) ;
-  DEBTRACE( "_pyfunc refcnt: " << _pyfunc->ob_refcnt );
-  Py_DECREF(args);
-  fflush(stdout);
-  fflush(stderr);
-  if(result == NULL)
-    {
-      _errorDetails="";
-      PyObject* new_stderr = newPyStdOut(_errorDetails);
-      PySys_SetObject((char*)"stderr", new_stderr);
-      std::ostringstream stream;
-      stream << "/tmp/PythonNode_";
-      stream << getpid();
-      ofstream errorfile(stream.str().c_str());
-      if (errorfile.is_open())
+      DEBTRACE( "_pyfunc refcnt: " << _pyfunc->ob_refcnt );
+      PyObject* result = PyObject_CallObject( _pyfunc , args ) ;
+      DEBTRACE( "_pyfunc refcnt: " << _pyfunc->ob_refcnt );
+      Py_DECREF(args);
+      fflush(stdout);
+      fflush(stderr);
+      if(result == NULL)
         {
-          errorfile << _script;
-          errorfile.close();
+          _errorDetails="";
+          PyObject* new_stderr = newPyStdOut(_errorDetails);
+          PySys_SetObject((char*)"stderr", new_stderr);
+          std::ostringstream stream;
+          stream << "/tmp/PythonNode_";
+          stream << getpid();
+          ofstream errorfile(stream.str().c_str());
+          if (errorfile.is_open())
+            {
+              errorfile << _script;
+              errorfile.close();
+            }
+          PyErr_Print();
+          PySys_SetObject((char*)"stderr", PySys_GetObject((char*)"__stderr__"));
+          Py_DECREF(new_stderr);
+          throw Exception("Error during execution");
         }
-      PyErr_Print();
-      PySys_SetObject((char*)"stderr", PySys_GetObject((char*)"__stderr__"));
-      Py_DECREF(new_stderr);
-
-      PyGILState_Release(gstate);
-      throw Exception("Error during execution");
-    }
-  DEBTRACE( "----------------End PyFuncNode::calculation---------------" );
+      DEBTRACE( "----------------End PyFuncNode::calculation---------------" );
 
-  DEBTRACE( "-----------------PyFuncNode::outputs-----------------" );
-  int nres=1;
-  if(result == Py_None)
-    nres=0;
-  else if(PyTuple_Check(result))
-    nres=PyTuple_Size(result);
+      DEBTRACE( "-----------------PyFuncNode::outputs-----------------" );
+      int nres=1;
+      if(result == Py_None)
+        nres=0;
+      else if(PyTuple_Check(result))
+        nres=PyTuple_Size(result);
 
-  if(getNumberOfOutputPorts() != nres)
-    {
-      std::string msg="Number of output arguments : Mismatch between definition and execution";
-      Py_DECREF(result);
-      PyGILState_Release(gstate);
-      _errorDetails=msg;
-      throw Exception(msg);
-    }
+      if(getNumberOfOutputPorts() != nres)
+        {
+          std::string msg="Number of output arguments : Mismatch between definition and execution";
+          Py_DECREF(result);
+          _errorDetails=msg;
+          throw Exception(msg);
+        }
 
-  pos=0;
+      pos=0;
 #ifdef _DEVDEBUG_
-  PyObject_Print(result,stderr,Py_PRINT_RAW);
-  cerr << endl;
+      PyObject_Print(result,stderr,Py_PRINT_RAW);
+      cerr << endl;
 #endif
-  list<OutputPort *>::iterator iter;
-  try
-    {
-      for(iter = _setOfOutputPort.begin(); iter != _setOfOutputPort.end(); iter++)
-        {
-          OutputPyPort *p=(OutputPyPort *)*iter;
-          DEBTRACE( "port name: " << p->getName() );
-          DEBTRACE( "port kind: " << p->edGetType()->kind() );
-          DEBTRACE( "port pos : " << pos );
-          if(PyTuple_Check(result))ob=PyTuple_GetItem(result,pos) ;
-          else ob=result;
-          DEBTRACE( "ob refcnt: " << ob->ob_refcnt );
+      list<OutputPort *>::iterator iter;
+      try
+      {
+          for(iter = _setOfOutputPort.begin(); iter != _setOfOutputPort.end(); iter++)
+            {
+              OutputPyPort *p=(OutputPyPort *)*iter;
+              DEBTRACE( "port name: " << p->getName() );
+              DEBTRACE( "port kind: " << p->edGetType()->kind() );
+              DEBTRACE( "port pos : " << pos );
+              if(PyTuple_Check(result))ob=PyTuple_GetItem(result,pos) ;
+              else ob=result;
+              DEBTRACE( "ob refcnt: " << ob->ob_refcnt );
 #ifdef _DEVDEBUG_
-          PyObject_Print(ob,stderr,Py_PRINT_RAW);
-          cerr << endl;
+              PyObject_Print(ob,stderr,Py_PRINT_RAW);
+              cerr << endl;
 #endif
-          p->put(ob);
-          pos++;
-        }
-    }
-  catch(ConversionException& ex)
-    {
+              p->put(ob);
+              pos++;
+            }
+      }
+      catch(ConversionException& ex)
+      {
+          Py_DECREF(result);
+          _errorDetails=ex.what();
+          throw;
+      }
+      DEBTRACE( "-----------------End PyFuncNode::outputs-----------------" );
       Py_DECREF(result);
-      PyGILState_Release(gstate);
-      _errorDetails=ex.what();
-      throw;
-    }
-  DEBTRACE( "-----------------End PyFuncNode::outputs-----------------" );
-
-  Py_DECREF(result);
-  PyGILState_Release(gstate);
+  }
   DEBTRACE( "++++++++++++++ End PyFuncNode::execute: " << getName() << " ++++++++++++++++++++" );
 }
 
@@ -1060,6 +1345,41 @@ Node *PyFuncNode::simpleClone(ComposedNode *father, bool editionOnly) const
   return new PyFuncNode(*this,father);
 }
 
+void PyFuncNode::createRemoteAdaptedPyInterpretor(Engines::Container_ptr objContainer)
+{
+  if(!CORBA::is_nil(_pynode))
+    _pynode->UnRegister();
+  _pynode=objContainer->createPyNode(getName().c_str(),getScript().c_str());
+}
+
+Engines::PyNodeBase_var PyFuncNode::retrieveDftRemotePyInterpretorIfAny(Engines::Container_ptr objContainer) const
+{
+  Engines::PyNode_var ret(objContainer->getDefaultPyNode(getName().c_str()));
+  if(!CORBA::is_nil(ret))
+    {
+      ret->Register();
+    }
+  return Engines::PyNodeBase::_narrow(ret);
+}
+
+void PyFuncNode::assignRemotePyInterpretor(Engines::PyNodeBase_var remoteInterp)
+{
+  if(!CORBA::is_nil(_pynode))
+    {
+      Engines::PyNode_var tmpp(Engines::PyNode::_narrow(remoteInterp));
+      if(_pynode->_is_equivalent(tmpp))
+        return ;
+    }
+  if(!CORBA::is_nil(_pynode))
+    _pynode->UnRegister();
+  _pynode=Engines::PyNode::_narrow(remoteInterp);
+}
+
+Engines::PyNodeBase_var PyFuncNode::getRemoteInterpreterHandle()
+{
+  return Engines::PyNodeBase::_narrow(_pynode);
+}
+
 //! Create a new node of same type with a given name
 PyFuncNode* PyFuncNode::cloneNode(const std::string& name)
 {
@@ -1083,23 +1403,7 @@ PyFuncNode* PyFuncNode::cloneNode(const std::string& name)
 
 std::string PyFuncNode::getContainerLog()
 {
-  if(_mode=="local")return "";
-
-  std::string msg;
-  try
-    {
-      Engines::Container_var objContainer=((SalomeContainer*)_container)->getContainerPtr(0);
-      CORBA::String_var logname = objContainer->logfilename();
-      DEBTRACE(logname);
-      msg=logname;
-      std::string::size_type pos = msg.find(":");
-      msg=msg.substr(pos+1);
-    }
-  catch(...)
-    {
-      msg = "Container no longer reachable";
-    }
-  return msg;
+  return PythonEntry::GetContainerLog(_mode,_container,this);
 }
 
 void PyFuncNode::shutdown(int level)
@@ -1114,3 +1418,23 @@ void PyFuncNode::shutdown(int level)
     }
 }
 
+void PyFuncNode::imposeResource(const std::string& resource_name,
+                                const std::string& container_name)
+{
+  if(!resource_name.empty() && !container_name.empty())
+  {
+    _imposedResource = resource_name;
+    _imposedContainer = container_name;
+  }
+}
+
+bool PyFuncNode::canAcceptImposedResource()
+{
+  return _container != nullptr && _container->canAcceptImposedResource();
+}
+
+bool PyFuncNode::hasImposedResource()const
+{
+  return PythonEntry::hasImposedResource();
+}
+