init RunAsyncUpdate

paddle/fluid/operators/listen_and_serv_op.cc

@@ -27,6 +27,36 @@ void RunServer(std::shared_ptr<detail::AsyncGRPCServer> service) {
   VLOG(4) << "RunServer thread end";
 }
 
+static void split(const std::string &str, char sep,
+                  std::vector<std::string> *pieces) {
+  pieces->clear();
+  if (str.empty()) {
+    return;
+  }
+  size_t pos = 0;
+  size_t next = str.find(sep, pos);
+  while (next != std::string::npos) {
+    pieces->push_back(str.substr(pos, next - pos));
+    pos = next + 1;
+    next = str.find(sep, pos);
+  }
+  if (!str.substr(pos).empty()) {
+    pieces->push_back(str.substr(pos));
+  }
+}
+
+static void AsyncExecuteBlock(framework::Executor *executor,
+                              framework::ExecutorPrepareContext *prepared,
+                              framework::Scope *scope) {
+  framework::Async([&executor, &prepared, &scope]() {
+    try {
+      executor->RunPreparedContext(prepared, scope, false, false);
+    } catch (std::exception &e) {
+      LOG(ERROR) << "run sub program error " << e.what();
+    }
+  });
+}
+
 static void ParallelExecuteBlocks(
     const std::vector<size_t> &parallel_blkids, framework::Executor *executor,
     const std::vector<std::shared_ptr<framework::ExecutorPrepareContext>>
@@ -168,12 +198,82 @@ void ListenAndServOp::RunSyncUpdate(
   }  // while(true)
 }
 
+void ListenAndServOp::RunAsyncUpdate(
+    framework::Executor *executor, framework::ProgramDesc *program,
+    framework::Scope *recv_scope, framework::BlockDesc *prefetch_block) const {
+  // grad name to block id
+  std::unordered_map<std::string, int32_t> grad_to_id;
+  std::unordered_map<int32_t, std::string> id_to_grad;
+
+  auto grad_map_str = Attr<std::vector<std::string>>("grad_map");
+  for (auto &grad_and_id : grad_map_str) {
+    std::vector<std::string> pieces;
+    split(grad_and_id, ' ', &pieces);
+    PADDLE_ENFORCE_EQ(pieces.size(), 2);
+    PADDLE_ENFORCE_EQ(grad_to_id.count(pieces[0]), 0);
+    int block_id = std::stoi(pieces[1]);
+    grad_to_id[pieces[0]] = block_id;
+    id_to_grad[block_id] = pieces[0];
+  }
+  size_t num_blocks = program->Size();
+  PADDLE_ENFORCE_GE(num_blocks, 2,
+                    "server program should have at least 2 blocks");
+
+  std::vector<int> block_list;
+  for (size_t blkid = 1; blkid < num_blocks; ++blkid) {
+    if (blkid != static_cast<size_t>(prefetch_block->ID())) {
+      block_list.push_back(blkid);
+    }
+  }
+  PADDLE_ENFORCE_EQ(grad_map_str.size(), block_list.size(),
+                    "grad num should be equal to optimize block num");
+  auto optimize_prepared = executor->Prepare(*program, block_list);
+
+  std::unordered_map<std::string,
+                     std::shared_ptr<framework::ExecutorPrepareContext>>
+      grad_to_prepared;
+  for (size_t i = 0; i < block_list.size(); ++i) {
+    grad_to_prepared[id_to_grad[block_list[i]]] = optimize_prepared[i];
+  }
+
+  bool exit_flag = false;
+  while (!exit_flag) {
+    const detail::ReceivedMessage v = rpc_service_->Get();
+    auto recv_var_name = v.first;
+    if (recv_var_name == LISTEN_TERMINATE_MESSAGE) {
+      LOG(INFO) << "received terminate message and exit";
+      exit_flag = true;
+      break;
+    } else {
+      VLOG(3) << "received grad: " << recv_var_name;
+      auto var = v.second->GetVar();
+      if (var == nullptr) {
+        LOG(ERROR) << "Can not find server side var: " << recv_var_name;
+        PADDLE_THROW("Can not find server side var");
+      }
+      AsyncExecuteBlock(executor, grad_to_prepared[recv_var_name].get(),
+                        recv_scope);
+      // TODO(qiao): explain why
+      if (var->IsType<framework::SelectedRows>()) {
+        var->GetMutable<framework::SelectedRows>()->mutable_rows()->clear();
+      }
+    }
+
+    if (exit_flag) {
+      rpc_service_->ShutDown();
+      break;
+    }
+  }  // while(true)
+}
+
 void ListenAndServOp::RunImpl(const framework::Scope &scope,
                               const platform::Place &dev_place) const {
   platform::DeviceContextPool &pool = platform::DeviceContextPool::Instance();
   auto &dev_ctx = *pool.Get(dev_place);
   framework::Scope &recv_scope = scope.NewScope();
 
+  bool sync_mode = Attr<bool>("sync_mode");
+
   PADDLE_ENFORCE(!rpc_service_);
   std::string endpoint = Attr<std::string>("endpoint");
   rpc_service_.reset(new detail::AsyncGRPCServer(endpoint));
@@ -201,7 +301,11 @@ void ListenAndServOp::RunImpl(const framework::Scope &scope,
   sleep(5);
   // Write to a file of server selected port for python use.
   SavePort(rpc_service_);
-  RunSyncUpdate(&executor, program, &recv_scope, prefetch_block);
+  if (sync_mode) {
+    RunSyncUpdate(&executor, program, &recv_scope, prefetch_block);
+  } else {
+    RunAsyncUpdate(&executor, program, &recv_scope, prefetch_block);
+  }
 }
 
 class ListenAndServOpMaker : public framework::OpProtoAndCheckerMaker {
@@ -220,6 +324,12 @@ from send_op and send back variables to recv_op.
                          "IP address to listen on.")
         .SetDefault("127.0.0.1:6164")
         .AddCustomChecker([](const std::string &ip) { return !ip.empty(); });
+    AddAttr<std::vector<std::string>>(
+        "grad_map(['param1@GRAD.block0:1', 'param2@GRAD.blockn:2'])",
+        "a map from grad name to it's optimize block id")
+        .SetDefault({});
+    AddAttr<bool>("sync_mode", "if works at sync_mode or not")
+        .SetDefault(false);
     AddAttr<framework::BlockDesc *>(kOptimizeBlock,
                                     "BlockID to run on server side.");
     AddAttr<framework::BlockDesc *>(kPrefetchBlock,

paddle/fluid/operators/listen_and_serv_op.h

@@ -46,6 +46,11 @@ class ListenAndServOp : public framework::OperatorBase {
                      framework::Scope* recv_scope,
                      framework::BlockDesc* prefetch_block) const;
 
+  void RunAsyncUpdate(framework::Executor* executor,
+                      framework::ProgramDesc* program,
+                      framework::Scope* recv_scope,
+                      framework::BlockDesc* prefetch_block) const;
+
   void Stop() override;
 
   void RunImpl(const framework::Scope& scope,