controller updated to accept the number of threads for parallel solve

controller/Controller.cpp

@@ -20,7 +20,7 @@ Controller::Controller() {
             ("create-synthetic-instance,c", boost::program_options::value<int>(),
              "Create synthetic instance (fully connected graph) with n vertices")
             ("solve,s", "Solve the instances in queue")
-            ("solve-parallel,p", "Parallel solve the instances in queue")
+            ("solve-parallel,p", boost::program_options::value<int>(), "Parallel solve the instances in queue, with number of threads")
             ("heuristic-combo,e", "Use nearest neighbour + 2Opt to approximate the best path");
 }
 
@@ -73,7 +73,8 @@ int Controller::run(int argc, char *argv[]) {
         }
 
         if (vm.contains("solve-parallel")) {
-            solve("p");
+            const int num_of_threads = vm["solve-parallel"].as<int>();
+            solve("p", num_of_threads);
         }
         if (vm.contains("heuristic-combo")) {
             heuristic_combo();
@@ -108,7 +109,7 @@ void Controller::create_synthetic_instance(const int num_of_nodes) {
     std::cout << "created synthetic instance with: " << num_of_nodes << " nodes" << std::endl;
 }
 
-void Controller::solve(const std::string &args) {
+void Controller::solve(const std::string &args, const int num_of_threads) {
     if (this->unsolvedInstances.empty()) {
         std::cout << "Nothing to solve!" << std::endl;
         return;
@@ -116,7 +117,7 @@ void Controller::solve(const std::string &args) {
     while (!this->unsolvedInstances.empty()) {
         std::cout << "Solving..." << std::endl;
         auto &instance = this->unsolvedInstances.front();
-        instance->solve(args);
+        instance->solve(args, num_of_threads);
         instance->print_statistics();
         if (!instance->is_solved()) {
             this->unsolvedInstances.pop_front();

controller/Controller.h

@@ -26,7 +26,7 @@ public:
 
     void create_synthetic_instance(int num_of_nodes);
 
-    void solve(const std::string& args);
+    void solve(const std::string& args, const int num_of_threads = 1);
 
     void heuristic_combo();
 };