Make test_pe_seresnext serial (#19634)

* make test_pe_seresnext serial
test=develop

* Increase test_pe_seresnext time limit on MAC
test=develop

python/paddle/fluid/tests/unittests/CMakeLists.txt

 file(GLOB TEST_OPS RELATIVE "${CMAKE_CURRENT_SOURCE_DIR}" "test_*.py")
 string(REPLACE ".py" "" TEST_OPS "${TEST_OPS}")
-set(GC_ENVS FLAGS_eager_delete_tensor_gb=0.0 FLAGS_fast_eager_deletion_mode=1 FLAGS_memory_fraction_of_eager_deletion=1.0) 
+set(GC_ENVS FLAGS_eager_delete_tensor_gb=0.0 FLAGS_fast_eager_deletion_mode=1 FLAGS_memory_fraction_of_eager_deletion=1.0)
 set(dist_ENVS http_proxy="" https_proxy="")
 
 if(NOT WITH_DISTRIBUTE)
@@ -50,7 +50,7 @@ endif()
 
 if(NOT WITH_GPU OR WIN32)
     LIST(REMOVE_ITEM TEST_OPS test_pipeline)
-endif() 
+endif()
 list(REMOVE_ITEM TEST_OPS test_seq_concat_op) # FIXME(helin): https://github.com/PaddlePaddle/Paddle/issues/8290
 list(REMOVE_ITEM TEST_OPS test_lstm_unit_op) # # FIXME(qijun) https://github.com/PaddlePaddle/Paddle/issues/5185
 list(REMOVE_ITEM TEST_OPS test_cond_op) # FIXME(qijun): https://github.com/PaddlePaddle/Paddle/issues/5101#issuecomment-339814957
@@ -112,7 +112,7 @@ function(py_test_modules TARGET_NAME)
     endif()
 
     if (py_test_modules_SERIAL)
-        set_property(TEST ${TARGET_NAME} PROPERTY RUN_SERIAL 1)            
+        set_property(TEST ${TARGET_NAME} PROPERTY RUN_SERIAL 1)
     endif()
 
     set_tests_properties(${TARGET_NAME} PROPERTIES TIMEOUT 350)
@@ -170,6 +170,9 @@ list(REMOVE_ITEM TEST_OPS test_imperative_se_resnext)
 list(REMOVE_ITEM TEST_OPS test_imperative_mnist)
 list(REMOVE_ITEM TEST_OPS test_ir_memory_optimize_transformer)
 list(REMOVE_ITEM TEST_OPS test_layers)
+list(REMOVE_ITEM TEST_OPS test_parallel_executor_seresnext_base_cpu)
+list(REMOVE_ITEM TEST_OPS test_parallel_executor_seresnext_with_reduce_cpu)
+list(REMOVE_ITEM TEST_OPS test_parallel_executor_seresnext_with_fuse_all_reduce_cpu)
 list(REMOVE_ITEM TEST_OPS test_imperative_ocr_attention_model)
 list(REMOVE_ITEM TEST_OPS test_async_ssa_graph_executor_mnist)
 list(REMOVE_ITEM TEST_OPS test_install_check)
@@ -179,7 +182,7 @@ list(REMOVE_ITEM TEST_OPS test_basic_lstm_api)
 list(REMOVE_ITEM TEST_OPS test_basic_lstm_unit_op)
 list(REMOVE_ITEM TEST_OPS test_imperative_debug_string)
 # Some ops need to check results when gc is enabled
-# Currently, only ops that register NoNeedBufferVarsInference need to do this test   
+# Currently, only ops that register NoNeedBufferVarsInference need to do this test
 set(TEST_OPS_WITH_GC
   test_affine_channel_op
   test_concat_op
@@ -294,14 +297,18 @@ set_tests_properties(test_parallel_executor_fetch_feed PROPERTIES TIMEOUT 450)
 py_test_modules(test_parallel_executor_transformer MODULES test_parallel_executor_transformer)
 py_test_modules(test_parallel_executor_transformer_auto_growth MODULES test_parallel_executor_transformer_auto_growth ENVS FLAGS_allocator_strategy=auto_growth)
 py_test_modules(test_layers MODULES test_layers ENVS FLAGS_cudnn_deterministic=1)
+py_test_modules(test_parallel_executor_seresnext_base_cpu MODULES test_parallel_executor_seresnext_base_cpu)
+py_test_modules(test_parallel_executor_seresnext_with_reduce_cpu MODULES test_parallel_executor_seresnext_with_reduce_cpu)
+py_test_modules(test_parallel_executor_seresnext_with_fuse_all_reduce_cpu MODULES test_parallel_executor_seresnext_with_fuse_all_reduce_cpu)
+
 if(NOT WIN32)
     py_test_modules(test_ir_memory_optimize_transformer MODULES test_ir_memory_optimize_transformer)
 endif()
 
-if(CMAKE_BUILD_TYPE STREQUAL "Debug")
+if(CMAKE_BUILD_TYPE STREQUAL "Debug" OR APPLE)
     set_tests_properties(test_parallel_executor_seresnext_base_cpu PROPERTIES TIMEOUT 900)
-    set_tests_properties(test_parallel_executor_seresnext_with_reduce_cpu PROPERTIES TIMEOUT 740)
-    set_tests_properties(test_parallel_executor_seresnext_with_fuse_all_reduce_cpu PROPERTIES TIMEOUT 450)
+    set_tests_properties(test_parallel_executor_seresnext_with_reduce_cpu PROPERTIES TIMEOUT 750)
+    set_tests_properties(test_parallel_executor_seresnext_with_fuse_all_reduce_cpu PROPERTIES TIMEOUT 750)
 endif()
 
 if (WITH_NGRAPH)