done

paddle/fluid/operators/detail/grpc_server.cc

@@ -208,9 +208,9 @@ void AsyncGRPCServer::WaitClientGet(int count) {
   }
 }
 
-bool AsyncGRPCServer::WaitServerReady() {
+void AsyncGRPCServer::WaitServerReady() {
   std::unique_lock<std::mutex> lock(this->mutex_ready_);
-  condition_ready_.wait(lock, [&] { return this->ready_ == 1; });
+  condition_ready_.wait(lock, [=] { return this->ready_ == 1; });
 }
 
 void AsyncGRPCServer::RunSyncUpdate() {

paddle/fluid/operators/detail/grpc_server.h

@@ -47,7 +47,7 @@ class AsyncGRPCServer final {
   explicit AsyncGRPCServer(const std::string &address, bool sync_mode)
       : address_(address), sync_mode_(sync_mode), ready_(0) {}
 
-  bool WaitServerReady();
+  void WaitServerReady();
   void RunSyncUpdate();
 
   // functions to sync server barrier status.
@@ -120,7 +120,7 @@ class AsyncGRPCServer final {
   framework::Executor *executor_;
   int selected_port_;
 
-  std::mutext mutex_ready_;
+  std::mutex mutex_ready_;
   std::condition_variable condition_ready_;
   int ready_;
 };

paddle/fluid/operators/listen_and_serv_op.cc

@@ -80,12 +80,7 @@ static void ParallelExecuteBlocks(
   for (size_t i = 0; i < fs.size(); ++i) fs[i].wait();
 }
 
-static void SavePort(std::shared_ptr<detail::AsyncGRPCServer> rpc_service) {
-  std::ofstream port_file;
-  port_file.open("/tmp/paddle.selected_port");
-  port_file << rpc_service->GetSelectedPort();
-  port_file.close();
-}
+std::atomic_int ListenAndServOp::selected_port_{0};
 
 ListenAndServOp::ListenAndServOp(const std::string &type,
                                  const framework::VariableNameMap &inputs,
@@ -93,15 +88,27 @@ ListenAndServOp::ListenAndServOp(const std::string &type,
                                  const framework::AttributeMap &attrs)
     : OperatorBase(type, inputs, outputs, attrs) {}
 
-int ListenAndServOp::GetSelectedPort() const {
-  return rpc_service_->GetSelectedPort();
-}
-
 void ListenAndServOp::Stop() {
   rpc_service_->Push(LISTEN_TERMINATE_MESSAGE);
   server_thread_->join();
 }
 
+void ListenAndServOp::SavePort(const std::string &file_path) const {
+  // NOTE: default write file to /tmp/paddle.selected_port
+  selected_port_ = rpc_service_->GetSelectedPort();
+
+  std::ofstream port_file;
+  port_file.open(file_path);
+  port_file << selected_port_.load();
+  port_file.close();
+  VLOG(4) << "selected port written to " << file_path;
+}
+
+void ListenAndServOp::WaitServerReady() {
+  while (selected_port_.load() == 0) {
+  }
+}
+
 void ListenAndServOp::RunSyncLoop(framework::Executor *executor,
                                   framework::ProgramDesc *program,
                                   framework::Scope *recv_scope,
@@ -265,23 +272,6 @@ void ListenAndServOp::RunAsyncLoop(framework::Executor *executor,
   }  // while(true)
 }
 
-void ListenAndServOp::StartServerThread() {
-  server_thread_.reset(new std::thread(
-      std::bind(&ListenAndServOp::ServerThreadEntry, this, rpc_service_)));
-}
-
-void ListenAndServOp::ServerThreadEntry(
-    std::shared_ptr<detail::AsyncGRPCServer> service) {
-  service->RunSyncUpdate();
-  VLOG(4) << "RunServer thread end";
-
-  {
-    std::lock_guard<std::mutex> lock(this->barrier_mutex_);
-    barrier_cond_step_ = cond;
-  }
-  barrier_condition_.notify_all();
-}
-
 void ListenAndServOp::RunImpl(const framework::Scope &scope,
                               const platform::Place &dev_place) const {
   platform::DeviceContextPool &pool = platform::DeviceContextPool::Instance();
@@ -315,9 +305,10 @@ void ListenAndServOp::RunImpl(const framework::Scope &scope,
   // start the server listening after all member initialized.
   server_thread_.reset(new std::thread(RunServer, rpc_service_));
   VLOG(3) << "wait server thread to become ready...";
+  rpc_service_->WaitServerReady();
 
   // Write to a file of server selected port for python use.
-  SavePort(rpc_service_);
+  SavePort();
   if (sync_mode) {
     RunSyncLoop(&executor, program, &recv_scope, prefetch_block);
   } else {

paddle/fluid/operators/listen_and_serv_op.h

@@ -15,6 +15,7 @@ limitations under the License. */
 #pragma once
 
 #include <stdint.h>
+#include <atomic>
 #include <ostream>
 #include <string>
 
@@ -39,8 +40,6 @@ class ListenAndServOp : public framework::OperatorBase {
                   const framework::VariableNameMap& outputs,
                   const framework::AttributeMap& attrs);
 
-  int GetSelectedPort() const;
-
   void RunSyncLoop(framework::Executor* executor,
                    framework::ProgramDesc* program,
                    framework::Scope* recv_scope,
@@ -51,20 +50,25 @@ class ListenAndServOp : public framework::OperatorBase {
                     framework::Scope* recv_scope,
                     framework::BlockDesc* prefetch_block) const;
 
-  void StartServerThread();
+  void SavePort(
+      const std::string& file_path = "/tmp/paddle.selected_port") const;
+
+  void WaitServerReady();
 
-  void ServerThreadEntry();
+  int GetSelectedPort() { return selected_port_; }
 
   void Stop() override;
 
   void RunImpl(const framework::Scope& scope,
                const platform::Place& dev_place) const override;
 
+  static void ResetPort() { selected_port_ = 0; }
+
  protected:
   mutable std::shared_ptr<detail::AsyncGRPCServer> rpc_service_;
   mutable std::shared_ptr<std::thread> server_thread_;
-  std::mutext server_ready_mutex_;
-  std::condition_variable server_ready_;
+  // FIXME(wuyi): it's static so that the operator can be cloned.
+  static std::atomic_int selected_port_;
 };
 
 }  // namespace operators

paddle/fluid/operators/send_recv_op_test.cc

@@ -116,6 +116,7 @@ void AddOp(const std::string &type, const f::VariableNameMap &inputs,
 void StartServerNet(bool is_sparse) {
   f::Scope scope;
   p::CPUPlace place;
+  VLOG(4) << "before init tensor";
   if (is_sparse) {
     InitSelectedRowsInScope(place, &scope);
   } else {
@@ -129,6 +130,7 @@ void StartServerNet(bool is_sparse) {
   auto *prefetch_block = program.AppendBlock(root_block);
   // X for server side tensors, RX for received tensors, must be of same shape.
   AddOp("sum", {{"X", {"x0", "x1"}}}, {{"Out", {"Out"}}}, {}, optimize_block);
+  VLOG(4) << "before attr";
 
   f::AttributeMap attrs;
   attrs.insert({"endpoint", std::string("127.0.0.1:0")});
@@ -139,15 +141,19 @@ void StartServerNet(bool is_sparse) {
   attrs.insert({"PrefetchBlock", prefetch_block});
   attrs.insert({"grad_to_block_id", std::vector<std::string>({""})});
   attrs.insert({"sync_mode", true});
+  VLOG(4) << "before init op";
   listen_and_serv_op =
       f::OpRegistry::CreateOp("listen_and_serv", {{"X", {"x1"}}}, {}, attrs);
+  VLOG(4) << "before run op";
   listen_and_serv_op->Run(scope, place);
   LOG(INFO) << "server exit";
 }
 
 TEST(SendRecvOp, CPUDense) {
   std::thread server_thread(StartServerNet, false);
-  sleep(5);  // wait server to start
+  // wait server to start
+  static_cast<paddle::operators::ListenAndServOp *>(listen_and_serv_op.get())
+      ->WaitServerReady();
   // local net
   f::Scope scope;
   p::CPUPlace place;
@@ -181,11 +187,13 @@ TEST(SendRecvOp, CPUDense) {
   listen_and_serv_op->Stop();
   server_thread.join();
   listen_and_serv_op.reset(nullptr);
+  paddle::operators::ListenAndServOp::ResetPort();
 }
 
 TEST(SendRecvOp, CPUSparse) {
   std::thread server_thread(StartServerNet, true);
-  sleep(3);  // wait server to start
+  static_cast<paddle::operators::ListenAndServOp *>(listen_and_serv_op.get())
+      ->WaitServerReady();
   // local net
   f::Scope scope;
   p::CPUPlace place;
@@ -226,4 +234,5 @@ TEST(SendRecvOp, CPUSparse) {
   listen_and_serv_op->Stop();
   server_thread.join();
   listen_and_serv_op.reset();
+  paddle::operators::ListenAndServOp::ResetPort();
 }