ParallelRestart: add method for loading only solution from restart

opm/simulators/utils/ParallelRestart.cpp

@@ -58,4 +58,27 @@ RestartValue loadParallelRestart(const EclipseIO* eclIO,
 #endif
 }
 
+data::Solution loadParallelRestartSolution(const EclipseIO* eclIO,
+                                           const std::vector<Opm::RestartKey>& solutionKeys,
+                                           [[maybe_unused]] Parallel::Communication comm,
+                                           const int step)
+{
+#if HAVE_MPI
+    data::Solution sol{};
+
+    if (eclIO)
+    {
+        assert(comm.rank() == 0);
+        sol = eclIO->loadRestartSolution(solutionKeys, step);
+    }
+
+    Parallel::MpiSerializer ser(comm);
+    ser.broadcast(0, sol);
+    return sol;
+#else
+    return eclIO->loadRestartSolution(solutionKeys, step);
+#endif
+}
+
+
 } // end namespace Opm

opm/simulators/utils/ParallelRestart.hpp

@@ -26,6 +26,7 @@
 namespace Opm {
 
 class EclipseIO;
+namespace data { class Solution; }
 class SummaryState;
 class RestartKey;
 class RestartValue;
@@ -42,6 +43,11 @@ RestartValue loadParallelRestart(const EclipseIO* eclIO,
                                  const std::vector<RestartKey>& extraKeys,
                                  Parallel::Communication comm);
 
+data::Solution loadParallelRestartSolution(const EclipseIO* eclIO,
+                                           const std::vector<RestartKey>& solutionKeys,
+                                           Parallel::Communication comm,
+                                           const int step);
+
 } // end namespace Opm
 
 #endif // PARALLEL_RESTART_HPP