[hybrid performance] optimize pipeline performance

python/paddle/fluid/executor.py

@@ -1506,6 +1506,7 @@ class Executor(object):
         trainer._set_infer(is_infer)
         trainer._gen_trainer_desc()
 
+        if program._pipeline_opt is None:
             self._dump_debug_info(program=program, trainer=trainer)
         # in case of calling _set_use_ps_gpu explicitly
         if dataset.use_ps_gpu is False: