changed interface to only have minimal overhead using true impes.

It gives overhead in constructor when linear system is created. No overhead if reuse is used.

This commit 141903a26 cherry-picked, cleaned and made compilable with
recent changes

opm/simulators/linalg/ISTLSolverEbosFlexible.hpp

@@ -148,6 +148,9 @@ public:
             assert(recreate_solver == false);
             // Never recreate solver.
         }
+
+        VectorType weights;
+
         if( prm_.get<std::string>("preconditioner.type") == "cpr" ||
             prm_.get<std::string>("preconditioner.type") == "cprt"
             )
@@ -157,17 +160,21 @@ public:
                 transpose = true;
             }
 
-
             if(prm_.get<std::string>("preconditioner.weight_type") == "quasiimpes") {
-                VectorType weights = Opm::Amg::getQuasiImpesWeights<MatrixType, VectorType>(
+                if( not( recreate_solver || !solver_) ){
+                    // weighs will be created as default in the solver
+                    weights = Opm::Amg::getQuasiImpesWeights<MatrixType, VectorType>(
                         mat.istlMatrix(),
                         prm_.get<int>("preconditioner.pressure_var_index"), transpose);
-                prm_.put("preconditioner.weights",weights);
+                }
 
             }else if(prm_.get<std::string>("preconditioner.weight_type") == "trueimpes"  ){
-                VectorType weights =
+                weights =
                     this->getTrueImpesWeights(b, prm_.get<int>("preconditioner.pressure_var_index"));
+                if( recreate_solver || !solver_){
+                    // need weights for the constructor
                     prm_.put("preconditioner.weights",weights);
+                }
             }else{
                 throw std::runtime_error("no such weights implemented for cpr");
             }
@@ -183,7 +190,7 @@ public:
             }
             rhs_ = b;
         } else {
-            solver_->preconditioner().update(prm_);
+            solver_->preconditioner().update(weights, prm_.get_child("preconditioner"));
             rhs_ = b;
         }
     }

opm/simulators/linalg/OwningBlockPreconditioner.hpp

@@ -63,9 +63,9 @@ public:
     }
 
     // The update() function does nothing for a wrapped preconditioner.
-    virtual void update(const boost::property_tree::ptree& p) override
+    virtual void update(const X& w,const boost::property_tree::ptree& pt) override
     {
-        orig_precond_.update(p);
+        orig_precond_.update(w, pt);
     }
 
 private:

opm/simulators/linalg/OwningTwoLevelPreconditioner.hpp

@@ -88,7 +88,13 @@ public:
         : linear_operator_(linearoperator)
         , finesmoother_(PrecFactory::create(linearoperator, prm.get_child("finesmoother")))
         , comm_(nullptr)
-        , weights_(prm.get<VectorType>("weights"))
+        , weights_(
+            (prm.get<std::string>("weight_type") != "quasiimpes") ?
+            prm.get<VectorType>("weights") :
+            Opm::Amg::getQuasiImpesWeights<MatrixType, VectorType>(linearoperator.getmat(),
+                                                                   prm.get<int>("pressure_var_index"),
+                                                                   transpose)
+            )
         , levelTransferPolicy_(dummy_comm_, weights_, prm.get<int>("pressure_var_index"))
         , coarseSolverPolicy_(prm.get_child("coarsesolver"))
         , twolevel_method_(linearoperator,
@@ -112,7 +118,13 @@ public:
         : linear_operator_(linearoperator)
         , finesmoother_(PrecFactory::create(linearoperator, prm.get_child("finesmoother"), comm))
         , comm_(&comm)
-        , weights_(prm.get<VectorType>("weights"))
+        , weights_(
+            (prm.get<std::string>("weight_type") != "quasiimpes") ?
+            prm.get<VectorType>("weights") :
+            Opm::Amg::getQuasiImpesWeights<MatrixType, VectorType>(linearoperator.getmat(),
+                                                                   prm.get<int>("pressure_var_index"),
+                                                                   transpose)
+            )
         , levelTransferPolicy_(*comm_, weights_, prm.get<int>("pressure_var_index"))
         , coarseSolverPolicy_(prm.get_child("coarsesolver"))
         , twolevel_method_(linearoperator,
@@ -149,11 +161,15 @@ public:
         twolevel_method_.post(x);
     }
 
-    virtual void update(const boost::property_tree::ptree& prm) override
+    virtual void update(const VectorType& weights, const boost::property_tree::ptree& /*prm*/) override
     {
+        // if(prm.get<std::string>("weight_type") == "quasiimpes"){
         //     Opm::Amg::getQuasiImpesWeights<MatrixType, VectorType>(
         //      linear_operator_.getmat(), prm_.get<int>("pressure_var_index"), transpose, weights_);
-        weights_ = prm.get<VectorType>("weights");
+        //     weights_ = prm.get<VectorType>("weights");
+        // }else{
+            weights_ = weights;
+            //}
         updateImpl(comm_);
     }
 

opm/simulators/linalg/ParallelOverlappingILU0.hpp

@@ -921,7 +921,7 @@ public:
         DUNE_UNUSED_PARAMETER(x);
     }
 
-    virtual void update(const boost::property_tree::ptree& = boost::property_tree::ptree()) override
+    virtual void update(const Range& = Range(), const boost::property_tree::ptree& = boost::property_tree::ptree()) override
     {
         // (For older DUNE versions the communicator might be
         // invalid if redistribution in AMG happened on the coarset level.

opm/simulators/linalg/PreconditionerWithUpdate.hpp

@@ -31,7 +31,7 @@ template <class X, class Y>
 class PreconditionerWithUpdate : public Preconditioner<X, Y>
 {
 public:
-    virtual void update(const boost::property_tree::ptree& pt) = 0;
+    virtual void update(const X& w, const boost::property_tree::ptree& pt) = 0;
 };
 
 template <class OriginalPreconditioner>
@@ -69,7 +69,7 @@ public:
     }
 
     // The update() function does nothing for a wrapped preconditioner.
-    virtual void update(const boost::property_tree::ptree& /* pt */) override
+    virtual void update(const X& /*w*/, const boost::property_tree::ptree& /*pt*/) override
     {
     }
 

opm/simulators/linalg/PressureSolverPolicy.hpp

@@ -85,7 +85,8 @@ namespace Amg
             void updatePreconditioner()
             {
                 pt::ptree prm;
-                linsolver_->preconditioner().update(prm);
+                X w;
+                linsolver_->preconditioner().update(w, prm);
             }
 
         private:

opm/simulators/linalg/amgcpr.hh

@@ -239,7 +239,7 @@ namespace Dune
       /**
        * @brief Update the coarse solver and the hierarchies.
        */
-      virtual void update(const boost::property_tree::ptree& prm);
+      virtual void update(const X& w, const boost::property_tree::ptree& prm);
 
       virtual void update();
       /**
@@ -470,7 +470,7 @@ namespace Dune
     }
 
     template<class M, class X, class S, class PI, class A>
-    void AMGCPR<M,X,S,PI,A>::update(const boost::property_tree::ptree& /* prm */)
+    void AMGCPR<M,X,S,PI,A>::update(const X& /*w*/, const boost::property_tree::ptree& /*prm*/)
     {
       update();
     }