尝试使用更细粒度的数据库锁

judge_dispatcher/models.py

@@ -17,20 +17,6 @@ class JudgeServer(models.Model):
     status = models.BooleanField(default=True)
     create_time = models.DateTimeField(auto_now_add=True, blank=True, null=True)
 
-    def use_judge_instance(self):
-        # 因为use 和 release 中间是判题时间，可能这个 model 的数据已经被修改了，所以不能直接使用self.xxx，否则取到的是旧数据
-        server = JudgeServer.objects.select_for_update().get(id=self.id)
-        server.left_instance_number -= 1
-        server.workload = 100 - int(float(server.left_instance_number) / server.max_instance_number * 100)
-        server.save()
-
-    def release_judge_instance(self):
-        # 使用原子操作
-        server = JudgeServer.objects.select_for_update().get(id=self.id)
-        server.left_instance_number += 1
-        server.workload = 100 - int(float(server.left_instance_number) / server.max_instance_number * 100)
-        server.save()
-
     class Meta:
         db_table = "judge_server"