diff --git a/python/jittor/__init__.py b/python/jittor/__init__.py
index 94dde310..7610ac1f 100644
--- a/python/jittor/__init__.py
+++ b/python/jittor/__init__.py
@@ -9,7 +9,7 @@
 # file 'LICENSE.txt', which is part of this source code package.
 # ***************************************************************
 
-__version__ = '1.2.3.36'
+__version__ = '1.2.3.37'
 from jittor_utils import lock
 with lock.lock_scope():
     ori_int = int
diff --git a/python/jittor/dataset/dataset.py b/python/jittor/dataset/dataset.py
index 46538e1a..be0c270f 100644
--- a/python/jittor/dataset/dataset.py
+++ b/python/jittor/dataset/dataset.py
@@ -72,6 +72,8 @@ class Dataset(object):
                  stop_grad = True,
                  keep_numpy_array = False):
         super().__init__()
+        if os.environ.get("DISABLE_MULTIPROCESSING", '0') == '1':
+            num_workers = 0
         self.total_len = None
         self.batch_size = batch_size
         self.shuffle = shuffle
diff --git a/python/jittor_utils/__init__.py b/python/jittor_utils/__init__.py
index b9e04353..1aeb1e51 100644
--- a/python/jittor_utils/__init__.py
+++ b/python/jittor_utils/__init__.py
@@ -193,6 +193,16 @@ def run_cmds(cmds, cache_path, jittor_path, msg="run_cmds"):
     finally:
         mp.current_process()._config['daemon'] = bk
 
+if os.environ.get("DISABLE_MULTIPROCESSING", '0') == '1':
+    os.environ["use_parallel_op_compiler"] = '1'
+    def run_cmds(cmds, cache_path, jittor_path, msg="run_cmds"):
+        cmds = [ [cmd, cache_path, jittor_path] for cmd in cmds ]
+        n = len(cmds)
+        dp = DelayProgress(msg, n)
+        for i,cmd in enumerate(cmds):
+            dp.update(i)
+            do_compile(cmd)
+
 
 def download(url, filename):
     if os.path.isfile(filename):