diff --git a/mindspore/train/summary/_event_writer.py b/mindspore/train/summary/_event_writer.py
index ae347135f62a7e83dcced3c2dc5618915c5ff09b..0a21dea04ec2d693987fe9d6ff582852d3c20f93 100644
--- a/mindspore/train/summary/_event_writer.py
+++ b/mindspore/train/summary/_event_writer.py
@@ -47,7 +47,7 @@ class EventWriter(Process):
 
     def run(self):
 
-        with Pool() as pool:
+        with Pool(min(cpu_count(), 32)) as pool:
             deq = deque()
             while True:
                 while deq and deq[0].ready():
diff --git a/mindspore/train/summary/summary_record.py b/mindspore/train/summary/summary_record.py
index b2bc872a1fffa7e6c86edf3ceb83b9666472c4eb..2c9b687db472d54dfa72c6b1666e28b5c9896dad 100644
--- a/mindspore/train/summary/summary_record.py
+++ b/mindspore/train/summary/summary_record.py
@@ -89,6 +89,8 @@ class SummaryRecord:
                  file_suffix="_MS",
                  network=None):
 
+        self._event_writer, self._closed = None, False
+
         _check_str_by_regular(file_prefix)
         _check_str_by_regular(file_suffix)
         self.log_path = _make_directory(log_dir)
@@ -113,7 +115,6 @@ class SummaryRecord:
         self.suffix = file_suffix
         self.network = network
         self.has_graph = False
-        self._closed = False
 
         # create the summary writer file
         self.event_file_name = get_event_file_name(self.prefix, self.suffix)
@@ -122,8 +123,6 @@ class SummaryRecord:
         except Exception as ex:
             raise RuntimeError(ex)
 
-        self._event_writer = None
-
     def _init_event_writer(self):
         """Init event writer and write metadata."""
         event_writer = EventWriter(self.full_file_name, self.flush_time)