fix multiprocess overwrite (#6488)

tools/infer/predict_system.py

@@ -201,7 +201,12 @@ def main(args):
         text_sys.text_detector.autolog.report()
         text_sys.text_recognizer.autolog.report()
 
-    with open(os.path.join(draw_img_save_dir, "system_results.txt"), 'w', encoding='utf-8') as f:
+    if args.total_process_num > 1:
+        save_results_path = os.path.join(draw_img_save_dir, f"system_results_{args.process_id}.txt")
+    else:
+        save_results_path = os.path.join(draw_img_save_dir, "system_results.txt")
+
+    with open(save_results_path, 'w', encoding='utf-8') as f:
         f.writelines(save_results)