From 064e549bdd54806a80ecb9e40306a853d2a5af13 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E7=9F=B3=E6=99=93=E4=BC=9F?=
 <39303645+Shixiaowei02@users.noreply.github.com>
Date: Wed, 6 Jul 2022 17:15:14 +0800
Subject: [PATCH] force single thread when CINN is on (#44103)

---
 python/paddle/fluid/compiler.py | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/python/paddle/fluid/compiler.py b/python/paddle/fluid/compiler.py
index 06f206c36d..38393311de 100644
--- a/python/paddle/fluid/compiler.py
+++ b/python/paddle/fluid/compiler.py
@@ -16,6 +16,7 @@ import multiprocessing
 import os
 import six
 import sys
+import warnings
 from .. import compat as cpt
 from . import framework
 from .framework import _get_paddle_place, _get_paddle_place_list
@@ -373,6 +374,12 @@ class CompiledProgram(object):
             else:
                 self._exec_strategy.num_threads = len(places) * 2
 
+        if "FLAGS_use_cinn" in core.globals() and core.globals(
+        )["FLAGS_use_cinn"] and self._exec_strategy.num_threads != 1:
+            warnings.warn("At present, when CINN is turned on, each process can " \
+                  "only contain one thread, so reset the number of threads to 1 here.")
+            self._exec_strategy.num_threads = 1
+
         if self._build_strategy.num_trainers > 1:
             assert self._is_data_parallel, \
                 "If you use multi-trainer to train the model, you should use "\
-- 
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