add: max_executor_thread_num

Author: Dream-Runner-Yu

src/libmodelbox/base/include/modelbox/base/executor.h

@@ -33,6 +33,8 @@ class Executor {
 
   virtual ~Executor();
 
+  void SetThreadCount(int thread_count);
+
   template <typename func, typename... ts>
   auto Run(func &&fun, int32_t priority, ts &&...params)
       -> std::future<typename std::result_of<func(ts...)>::type> {

src/libmodelbox/engine/flowunit_data_executor.cc

@@ -34,6 +34,10 @@ Executor::Executor(int thread_count) {
 
 Executor::~Executor() { thread_pool_ = nullptr; }
 
+void Executor::SetThreadCount(int thread_count){
+  thread_pool_->SetThreadSize(thread_count);
+}
+
 FlowUnitExecContext::FlowUnitExecContext(
     std::shared_ptr<FlowUnitDataContext> data_ctx)
     : data_ctx_(std::move(data_ctx)) {}

src/libmodelbox/engine/flowunit_manager.cc

@@ -59,6 +59,13 @@ Status FlowUnitManager::Initialize(
   SetDeviceManager(std::move(device_mgr));
   Status status;
   status = InitFlowUnitFactory(driver);
+
+  if (config != nullptr){
+    max_executor_thread_num = config->GetUint32("graph.max_executor_thread_num", 0);
+  } else {
+    max_executor_thread_num = 0;
+  }
+  
   if (status != STATUS_SUCCESS) {
     return status;
   }

src/libmodelbox/include/modelbox/flowunit.h

@@ -612,6 +612,8 @@ class FlowUnitManager {
 
   std::shared_ptr<DeviceManager> GetDeviceManager();
 
+  int max_executor_thread_num;
+ 
  private:
   Status CheckParams(const std::string &unit_name, const std::string &unit_type,
                      const std::string &unit_device_id);