added: command line option for zoltan customization

modeled after the linsolver support. a few built-in presets,
as well as reading options from a json file

opm/simulators/utils/SetupZoltanParams.cpp

@@ -0,0 +1,60 @@
+/*
+  Copyright 2022 SINTEF Digital, Mathematics and Cybernetics.
+
+  This file is part of the Open Porous Media project (OPM).
+
+  OPM is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  OPM is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with OPM.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <config.h>
+#include <opm/simulators/utils/SetupZoltanParams.hpp>
+
+#include <opm/common/OpmLog/OpmLog.hpp>
+
+#include <boost/property_tree/json_parser.hpp>
+
+namespace Opm
+{
+
+
+std::map<std::string,std::string> setupZoltanParams(const std::string& conf)
+{
+    std::map<std::string,std::string> result;
+
+    if (conf == "scotch") {
+        result.emplace("LB_METHOD", "GRAPH");
+        result.emplace("GRAPH_PACKAGE", "Scotch");
+    } else if (conf == "hypergraph") {
+        result.emplace("LB_METHOD", "HYPERGRAPH");
+    } else if (conf == "graph") {
+        result.emplace("LB_METHOD", "GRAPH");
+        result.emplace("GRAPH_PACKAGE", "PHG");
+    } else { // json file
+        boost::property_tree::ptree tree;
+        try {
+            boost::property_tree::read_json(conf, tree);
+        } catch (boost::property_tree::json_parser::json_parser_error& err) {
+            OpmLog::error(err.what());
+        }
+        for (const auto& node : tree) {
+            auto value = node.second.get_value_optional<std::string>();
+            if (value)
+              result.insert_or_assign(node.first, *value);
+        }
+    }
+
+    return result;
+}
+
+} // namespace Opm

opm/simulators/utils/SetupZoltanParams.hpp

@@ -0,0 +1,32 @@
+/*
+  Copyright 2022 SINTEF Digital, Mathematics and Cybernetics.
+
+  This file is part of the Open Porous Media project (OPM).
+
+  OPM is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  OPM is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with OPM.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef OPM_SETUP_ZOLTAN_PARAMS_HPP
+#define OPM_SETUP_ZOLTAN_PARAMS_HPP
+
+#include <map>
+#include <string>
+
+namespace Opm {
+
+std::map<std::string,std::string> setupZoltanParams(const std::string& conf);
+
+} // namespace Opm
+
+#endif // OPM_SETUP_ZOLTAN_PARAMS_HPP