fix test and clean up

paddle/fluid/operators/detail/grpc_server.cc

@@ -25,6 +25,7 @@ namespace detail {
 namespace {
 const int kNumHandleSendThreads = 20;
 const int kNumHandleGetThreads = 20;
+const int kNumHandlePrefetchThreads = 1;
 }  // namespace
 enum CallStatus { PROCESS = 0, FINISH };
 
@@ -180,8 +181,9 @@ class RequestPrefetch final : public RequestBase {
       request_.reset(new VariableResponse(scope, dev_ctx_, true));
     }
     int method_id = static_cast<int>(detail::GrpcMethod::kPrefetchVariable);
-    service_->RequestAsyncUnary(method_id, &ctx_, request_.get(), &responder_,
-                                cq_, cq_, this);
+    service_->RequestAsyncUnary(
+        method_id, &ctx_, request_.get(), &responder_, cq_, cq_,
+        reinterpret_cast<void*>(static_cast<intptr_t>(req_id_)));
   }
 
   virtual ~RequestPrefetch() {}
@@ -190,7 +192,6 @@ class RequestPrefetch final : public RequestBase {
 
   virtual void Process() {
     // prefetch process...
-    ::grpc::ByteBuffer reply;
 
     std::string var_name = request_->OutVarname();
     VLOG(3) << "RequestPrefetch " << var_name;
@@ -200,15 +201,16 @@ class RequestPrefetch final : public RequestBase {
     InitializeVariable(var, var_desc->GetType());
     executor_->RunPreparedContext(prefetch_ctx_, scope_);
 
-    SerializeToByteBuffer(var_name, var, *dev_ctx_, &reply);
+    SerializeToByteBuffer(var_name, var, *dev_ctx_, &reply_);
 
-    responder_.Finish(reply, ::grpc::Status::OK,
-                      reinterpret_cast<void*>(static_cast<intptr_t>(req_id_)));
     status_ = FINISH;
+    responder_.Finish(reply_, ::grpc::Status::OK,
+                      reinterpret_cast<void*>(static_cast<intptr_t>(req_id_)));
   }
 
  protected:
   std::shared_ptr<VariableResponse> request_;
+  ::grpc::ByteBuffer reply_;
   ServerAsyncResponseWriter<::grpc::ByteBuffer> responder_;
   framework::Scope* scope_;
   framework::Executor* executor_;
@@ -262,6 +264,9 @@ void AsyncGRPCServer::RunSyncUpdate() {
   for (int i = 0; i < kGetReqsBufSize; ++i) {
     TryToRegisterNewGetOne(i);
   }
+  for (int i = 0; i < kPrefetchReqsBufSize; ++i) {
+    TryToRegisterNewPrefetchOne(i);
+  }
 
   for (int i = 0; i < kNumHandleSendThreads; ++i) {
     t_sends_.emplace_back(
@@ -273,12 +278,11 @@ void AsyncGRPCServer::RunSyncUpdate() {
         new std::thread(std::bind(&AsyncGRPCServer::HandleRequest, this,
                                   cq_get_.get(), "cq_get", get_register)));
   }
-
-  // TODO(wuyi): Run these "HandleRequest" in thread pool
-  t_prefetch_.reset(new std::thread(
-      std::bind(&AsyncGRPCServer::HandleRequest, this, cq_prefetch_.get(),
-                "cq_prefetch", prefetch_register)));
-
+  for (int i = 0; i < kNumHandlePrefetchThreads; ++i) {
+    t_prefetchs_.emplace_back(new std::thread(
+        std::bind(&AsyncGRPCServer::HandleRequest, this, cq_prefetch_.get(),
+                  "cq_prefetch", prefetch_register)));
+  }
   {
     std::lock_guard<std::mutex> lock(this->mutex_ready_);
     ready_ = 1;
@@ -292,7 +296,9 @@ void AsyncGRPCServer::RunSyncUpdate() {
   for (int i = 0; i < kNumHandleGetThreads; ++i) {
     t_gets_[i]->join();
   }
-  t_prefetch_->join();
+  for (int i = 0; i < kNumHandlePrefetchThreads; ++i) {
+    t_prefetchs_[i]->join();
+  }
 }
 
 void AsyncGRPCServer::ShutdownQueue() {
@@ -342,6 +348,7 @@ void AsyncGRPCServer::TryToRegisterNewPrefetchOne(int req_id) {
   RequestPrefetch* prefetch = new RequestPrefetch(
       &service_, cq_prefetch_.get(), sync_mode_, scope_, dev_ctx_, executor_,
       program_, prefetch_ctx_.get(), req_id);
+  prefetch_reqs_[req_id] = static_cast<RequestBase*>(prefetch);
 
   VLOG(4) << "Create RequestPrefetch status:" << prefetch->Status();
 }
@@ -376,8 +383,8 @@ void AsyncGRPCServer::HandleRequest(
         base = get_reqs_[req_id];
       } else if (cq_name == "cq_send") {
         base = send_reqs_[req_id];
-      } else {
-        CHECK(false);
+      } else if (cq_name == "cq_prefetch") {
+        base = prefetch_reqs_[req_id];
       }
     }
     // reference:

paddle/fluid/operators/detail/grpc_server.h

@@ -93,6 +93,7 @@ class AsyncGRPCServer final {
  private:
   static const int kSendReqsBufSize = 100;
   static const int kGetReqsBufSize = 100;
+  static const int kPrefetchReqsBufSize = 10;
 
   std::mutex cq_mutex_;
   volatile bool is_shut_down_ = false;
@@ -102,6 +103,7 @@ class AsyncGRPCServer final {
 
   RequestBase *send_reqs_[kSendReqsBufSize];
   RequestBase *get_reqs_[kGetReqsBufSize];
+  RequestBase *prefetch_reqs_[kPrefetchReqsBufSize];
 
   GrpcService::AsyncService service_;
   std::unique_ptr<::grpc::Server> server_;
@@ -123,6 +125,7 @@ class AsyncGRPCServer final {
 
   std::vector<std::unique_ptr<std::thread>> t_sends_;
   std::vector<std::unique_ptr<std::thread>> t_gets_;
+  std::vector<std::unique_ptr<std::thread>> t_prefetchs_;
 
   std::unique_ptr<std::thread> t_prefetch_;