add parallel graph dist test (#16076)

* add parallel graph dist test=develop

* update test=develop

* update style test=develop

paddle/fluid/framework/details/parallel_ssa_graph_executor.cc

@@ -13,6 +13,8 @@
 // limitations under the License.
 
 #include "paddle/fluid/framework/details/parallel_ssa_graph_executor.h"
+#include <memory>
+#include <utility>
 #include "paddle/fluid/framework/ir/graph_helper.h"
 
 namespace paddle {
@@ -29,6 +31,11 @@ ParallelSSAGraphExecutor::SeparateMultiDevicesGraph(ir::Graph *graph) {
     auto &g = graphs.back();
     g->Set(kGraphVars, new GraphVars(1UL));
     g->Set(kGraphDepVars, new GraphDepVars);
+    auto &stale_ops =
+        graph->Get<const std::vector<OpDesc *>>(details::kStaleProgramOpDescs);
+    g->Erase(details::kStaleProgramOpDescs);
+    g->Set<const std::vector<OpDesc *>>(details::kStaleProgramOpDescs,
+                                        new std::vector<OpDesc *>(stale_ops));
   }
   auto op_handles = ir::FilterByNodeWrapper<OpHandleBase>(*graph);
 

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

@@ -0,0 +1,40 @@
+#   Copyright (c) 2018 PaddlePaddle Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from __future__ import print_function
+import unittest
+from test_dist_base import TestDistBase
+
+
+class TestDistMnistNCCL2(TestDistBase):
+    def _setup_config(self):
+        self._sync_mode = True
+        self._use_reduce = False
+        self._use_reader_alloc = False
+        self._nccl2_mode = True
+
+    def test_dist_train(self):
+        import paddle.fluid as fluid
+        if fluid.core.is_compiled_with_cuda():
+            self.check_with_place(
+                "dist_mnist.py",
+                delta=1,
+                need_envs={
+                    "FLAGS_enable_parallel_graph": "1",
+                    "FLAGS_sync_nccl_allreduce": "1"
+                })
+
+
+if __name__ == "__main__":
+    unittest.main()