优化对比测试器，调整最大工作线程数为5，并改用多线程并发处理问题，提升处理效率。

rag2_0/dify/test_dify_chatapi.py

@@ -29,7 +29,7 @@ class DifyComparisonTester:
     Dify新旧流程对比测试类，用于比较两个不同流程的问答效果并进行评判
     """
     def __init__(self, excel_path:str, baseurl:str, old_workflow_api_key:str, new_workflow_api_key:str, 
-                 wiki_excel_path:str=None, output_path:str=None, max_workers:int=10):
+                 wiki_excel_path:str=None, output_path:str=None, max_workers:int=5):
         """
         初始化对比测试器
         
@@ -473,11 +473,21 @@ content: "{content}"
         # 选择处理函数
         process_func = self.process_question_with_judge if with_judge else self.process_question
 
-        # 按顺序处理问题
+        # 使用多线程并发处理问题
+        with ThreadPoolExecutor(max_workers=self.max_workers) as executor:
+            # 创建进度条
             with tqdm(total=len(questions), desc="处理问题进度") as pbar:
+                # 提交所有任务
+                futures = []
                 for q in questions:
-                result = process_func(q)
+                    future = executor.submit(process_func, q)
+                    futures.append(future)
+                
+                # 处理结果
+                for future in as_completed(futures):
+                    result = future.result()
                     if result is not None:
+                        with self.results_lock:
                             results.append(result)
                     pbar.update(1)