Fix communicator slow bug & fix communicator stop bug (#20366)

* test=develop,Fix communicator slow bug

* test=develop, delete if() in stop_worker()

* test=develop

* fix UT, test=develop

* fix bug in fetch handler, test=develop

* fix bug in fetch handler, test=develop

* test=develop, fix fetch barrier bug

* test=develop, bug fix

* test=develop, bug fix

* test=develop, fix bug

paddle/fluid/framework/dist_multi_trainer.cc

@@ -144,6 +144,10 @@ void DistMultiTrainer::Run() {
   }
 }
 
+Scope *DistMultiTrainer::GetWorkerScope(int thread_id) {
+  return workers_[thread_id]->GetThreadScope();
+}
+
 void DistMultiTrainer::Finalize() {
   for (auto &th : threads_) {
     th.join();
@@ -199,5 +203,5 @@ void DistMultiTrainer::MergeToRootScope(LoDTensor *root_tensor,
     root_data[i] += data[i];
   }
 }
-}  // end namespace framework
+}  // namespace framework
-}  // end namespace paddle
+}  // namespace paddle

paddle/fluid/framework/trainer.h

@@ -93,8 +93,8 @@ class DistMultiTrainer : public MultiTrainer {
   void MergeToRootScope(LoDTensor* root_tensor, LoDTensor* thread_tensor);
   virtual void FinalizeDumpEnv();
   virtual void InitDumpEnv();
+  virtual Scope* GetWorkerScope(int thread_id);
   virtual void DumpWork(int tid);
-  virtual Scope* GetWorkerScope(int thread_id) { return root_scope_; }
 
  protected:
   std::shared_ptr<paddle::framework::PullDenseWorker> pull_dense_worker_;

paddle/fluid/operators/distributed/rpc_client.cc

@@ -17,7 +17,7 @@
 
 // default to 3min to avoid temprary network failures.
 DEFINE_int32(rpc_deadline, 180000, "deadline timeouts for rpc");
-DEFINE_int32(rpc_retry_times, 3, "retry times for rpc");
+DEFINE_int32(rpc_retry_times, 0, "retry times for rpc");
 
 namespace paddle {
 namespace operators {

paddle/fluid/operators/distributed_ops/fetch_barrier_op.cc

@@ -55,6 +55,9 @@ class FetchBarrierOp : public framework::OperatorBase {
 class FetchBarrierOpMaker : public framework::OpProtoAndCheckerMaker {
  public:
   void Make() {
+    AddInput("X", "(Any) Dummy inputs, used for control dependency")
+        .AsDispensable()
+        .AsDuplicable();
     AddOutput("Out", "(Any) Dummy outputs, used for control dependency")
         .AsDuplicable();
     AddComment(R"DOC(

python/paddle/fluid/incubate/fleet/parameter_server/distribute_transpiler/__init__.py

@@ -129,8 +129,7 @@ class DistributedTranspiler(Fleet):
         Returns:
             None
         """
-        if not self._transpile_config.sync_mode and self._communicator.is_running(
+        if not self._transpile_config.sync_mode:
-        ):
             self._communicator.stop()
         self._executor.close()
         if isinstance(self._role_maker, MPISymetricRoleMaker):

python/paddle/fluid/tests/unittests/ctr_dataset_reader.py

@@ -67,7 +67,7 @@ class DatasetCtrReader(data_generator.MultiSlotDataGenerator):
             return random.random()
 
         def iter():
-            if get_rand() < 0.1:
+            if get_rand() < 0.05:
                 fs = line.strip().split('\t')
                 dnn_input = load_dnn_input_record(fs[0])
                 lr_input = load_lr_input_record(fs[1])

python/paddle/fluid/tests/unittests/dist_fleet_ctr.py

@@ -139,7 +139,7 @@ class TestDistCTR2x2(FleetDistRunnerBase):
         dataset.set_filelist(filelist)
         dataset.set_thread(thread_num)
 
-        for epoch_id in range(2):
+        for epoch_id in range(1):
             pass_start = time.time()
             dataset.set_filelist(filelist)
             exe.train_from_dataset(
@@ -157,7 +157,7 @@ class TestDistCTR2x2(FleetDistRunnerBase):
                     print("{}: \n {}\n".format(self.fetch_target_names[0],
                                                fetch_target_vars[0]))
 
-        for epoch_id in range(2):
+        for epoch_id in range(1):
             pass_start = time.time()
             dataset.set_filelist(filelist)
             exe.train_from_dataset(

python/paddle/fluid/tests/unittests/test_dist_fleet_ctr.py

@@ -30,7 +30,6 @@ def skip_ci(func):
     return __func__
 
 
-@skip_ci
 class TestDistMnist2x2(TestFleetBase):
     def _setup_config(self):
         self._sync_mode = False

python/paddle/fluid/trainer_factory.py

@@ -84,6 +84,9 @@ class FetchHandlerMonitor(object):
                     for varname in fetch_target_names
                 ]
 
+                if None in fetch_vars:
+                    continue
+
                 fetch_tensors = [var.get_tensor() for var in fetch_vars]
 
                 if self.fetch_instance.return_np:

python/paddle/fluid/transpiler/distribute_transpiler.py

@@ -701,6 +701,7 @@ class DistributeTranspiler(object):
                 send_vars.append(var)
 
         if self.sync_mode:
+            fetch_barrier_input = []
             send_barrier_out = program.global_block().create_var(
                 name=framework.generate_control_dev_var_name())
             if self.has_distributed_lookup_table:
@@ -718,6 +719,7 @@ class DistributeTranspiler(object):
                     "trainer_id": self.trainer_id,
                     RPC_OP_ROLE_ATTR_NAME: RPC_OP_ROLE_ATTR_VALUE
                 })
+            fetch_barrier_input.append(send_barrier_out)
 
         # step 3: insert recv op to receive parameters from parameter server
         recv_vars = []
@@ -788,12 +790,14 @@ class DistributeTranspiler(object):
                         OP_ROLE_VAR_ATTR_NAME:
                         [param_varname, recv_op_role_var_name]
                     })
+                if self.sync_mode:
+                    fetch_barrier_input.extend(splited_var)
 
         if self.sync_mode:
             # form a WAW dependency
             program.global_block().append_op(
                 type="fetch_barrier",
-                inputs={},
+                inputs={"X": fetch_barrier_input},
                 outputs={"Out": all_recv_outputs},
                 attrs={
                     "endpoints": pserver_endpoints,