From 364376e5fd2a629a4e9194a433af3cbcd7e6045d Mon Sep 17 00:00:00 2001
From: Leo Chen <chenqiuliang@baidu.com>
Date: Mon, 6 Dec 2021 11:13:50 +0800
Subject: [PATCH] [new-exec] enable sequential run for debug (#37835)

* enable sequential_run for standalone_executor

* add ut

* fix ut
---
 .../new_executor/interpretercore_util.cc        | 17 +++++++++++++++++
 .../new_executor/interpretercore_util.h         |  4 +---
 .../interpreter/test_standalone_executor.py     | 10 ++++++++++
 3 files changed, 28 insertions(+), 3 deletions(-)

diff --git a/paddle/fluid/framework/new_executor/interpretercore_util.cc b/paddle/fluid/framework/new_executor/interpretercore_util.cc
index 0501522a7a..3817a11b9a 100644
--- a/paddle/fluid/framework/new_executor/interpretercore_util.cc
+++ b/paddle/fluid/framework/new_executor/interpretercore_util.cc
@@ -20,9 +20,26 @@
 #include "paddle/fluid/operators/controlflow/recurrent_op_helper.h"
 #include "paddle/fluid/operators/controlflow/while_op_helper.h"
 
+PADDLE_DEFINE_EXPORTED_bool(
+    new_executor_sequential_run, false,
+    "Enable sequential execution for standalone executor, used for debug");
 namespace paddle {
 namespace framework {
 namespace interpreter {
+
+void AsyncWorkQueue::AddTask(const OpFuncType& op_func_type,
+                             std::function<void()> fn) {
+  // NOTE(zhiqiu): use thhe second queue of size of, so only one thread is used.
+  if (FLAGS_new_executor_sequential_run) {
+    VLOG(4) << "FLAGS_new_executor_sequential_run:"
+            << FLAGS_new_executor_sequential_run;
+    queue_group_->AddTask(static_cast<size_t>(OpFuncType::kQueueAsync),
+                          std::move(fn));
+  } else {
+    queue_group_->AddTask(static_cast<size_t>(op_func_type), std::move(fn));
+  }
+}
+
 using VariableIdMap = std::map<std::string, std::vector<int>>;
 
 AtomicVectorSizeT& AsyncWorkQueue::PrepareAtomicDeps(
diff --git a/paddle/fluid/framework/new_executor/interpretercore_util.h b/paddle/fluid/framework/new_executor/interpretercore_util.h
index c92cea6c97..8f27c7e181 100644
--- a/paddle/fluid/framework/new_executor/interpretercore_util.h
+++ b/paddle/fluid/framework/new_executor/interpretercore_util.h
@@ -77,9 +77,7 @@ class AsyncWorkQueue {
 
   // void WaitEmpty() { queue_group_->WaitQueueGroupEmpty(); }
 
-  void AddTask(const OpFuncType& op_func_type, std::function<void()> fn) {
-    queue_group_->AddTask(static_cast<size_t>(op_func_type), std::move(fn));
-  }
+  void AddTask(const OpFuncType& op_func_type, std::function<void()> fn);
 
   void Cancel() { queue_group_->Cancel(); }
 
diff --git a/python/paddle/fluid/tests/unittests/interpreter/test_standalone_executor.py b/python/paddle/fluid/tests/unittests/interpreter/test_standalone_executor.py
index 23dee7338a..01b2cccfc4 100644
--- a/python/paddle/fluid/tests/unittests/interpreter/test_standalone_executor.py
+++ b/python/paddle/fluid/tests/unittests/interpreter/test_standalone_executor.py
@@ -130,6 +130,10 @@ class MultiStreamModelTestCase(unittest.TestCase):
         for gt, out in zip(ground_truths, res):
             self.assertEqual(gt[0], out[0])
 
+        res_sequential = self.run_new_executor_sequential()
+        for gt, out in zip(ground_truths, res_sequential):
+            self.assertEqual(gt[0], out[0])
+
     def run_raw_executor(self):
         paddle.seed(2020)
         main_program, startup_program, fetch_list = build_program()
@@ -158,6 +162,12 @@ class MultiStreamModelTestCase(unittest.TestCase):
                 np.array(inter_core.run({}, fetch_list)._move_to_list()[0]))
         return outs
 
+    def run_new_executor_sequential(self):
+        os.environ['FLAGS_new_executor_sequential_run'] = '1'
+        res = self.run_new_executor()
+        del os.environ['FLAGS_new_executor_sequential_run']
+        return res
+
 
 class SwitchExecutorInterfaceTestCase(MultiStreamModelTestCase):
     def run_new_executor(self):
-- 
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